Maryland's Defense Patent Database

The defense community in Maryland is an R&D powerhouse.

Use this database to see the innovative patents that are poised for commercialization.

Method and apparatus for analyzing the spectrum of radio-frequency signals using unamplified fiber optic recirculation loops

Patent image
ARL

An apparatus for generating a frequency spectrum of an RF signal comprising a gate switch for generating a series of pulses from a laser of wavelength lambda modulated by an input RF signal, a first fiber optical loop for circulating a first percentage of a first pulse of the series of pulses from the gate switch, for a predetermined number of cycles n where each cycle takes time t1, a second fiber optical loop for conducting a second percentage of the first pulse for predetermined number of cycles “k”, where each cycle takes time t2, where t2*k=t1*n, a first switch with a first state for coupling the first pulse from the gate switch to a coupler, the coupler coupling the first pulse into the first fiber optical loop and tapping replicas of the pulse from the first fiber optical loop, and a second state for coupling the second percentage of the first pulse to the coupler to increase intensity of the tapped replica pulses, a processor for correlating the replicas of the pulse with each other to produce a set of data points comprising a plurality of multiplexed correlated pulses and transforming the data points into a channelized frequency spectrum of the input RF signal.

Inventors: 
Zhou, Weimin
Patent Number: 
US9288557
Technical domain: 
Communications
FIle Date: 
2013-07-31
Grant Date: 
2016-03-15
Grant time: 
958 days
Grant time percentile rank: 
17
Claim count percentile rank: 
5
Citations percentile rank: 
1
'Cited by' percentile rank: 
1
Assignee: 
US ARMY

Collaborative environment implemented on a distributed computer network and software therefor

Patent image
NSWCDD

A Collaborator computer collaborative environment (CCE) instantiated by a computer network includes N Collaborator CCE clients and a Collaborator CCE server. Each of the N Collaborator CCE clients generates message objects each including a nested group identifier and an associated privilege level; the Collaborator CCE server filters the generated message objects and routes only those message objects to an Nth Collaborator CCE client that is a member of the respective group having the group identifier and that has a privilege greater than or equal to the associated privilege level. Corresponding software is also described.

Inventors: 
Simonoff, Adam J.; Hebert Jr., Julian B.
Patent Number: 
US7162528
Technical domain: 
Communications
FIle Date: 
2002-10-01
Grant Date: 
2007-01-09
Grant time: 
1,561 days
Grant time percentile rank: 
28
Claim count percentile rank: 
3
Citations percentile rank: 
2
'Cited by' percentile rank: 
7
Assignee: 
US NAVY

Self-assembled electrical contacts

Patent image
ARL

Self-assembling microscale electrical and mechanical connections includes a part binding site and a part electrical binding site; and a template binding site comprising a template electrical conductor layer; a metallization layer on the template electrical conductor layer; a bump structure comprising a solder alloy positioned on the metallization layer, wherein the solder alloy is liquefied to allow the bump structure to self-assemble and align with the part electrical binding site using capillary forces, and wherein the solder alloy only liquefies at a temperature above that at which the self-assembly and alignment is performed; and a fluid on the template electrical conductor layer, wherein the fluid comprises a melting point lower than that of the solder alloy, wherein the fluid binds with the part binding site.

Inventors: 
Morris, Christopher J.; Dubey, Mandan
Patent Number: 
US8318595
Technical domain: 
Communications
FIle Date: 
2009-11-24
Grant Date: 
2012-11-27
Grant time: 
1,099 days
Grant time percentile rank: 
20
Claim count percentile rank: 
2
Citations percentile rank: 
1
'Cited by' percentile rank: 
1
Assignee: 
US ARMY

Multiple-buffer queueing of data packets with high throughput rate

Patent image
NRL

The present invention is a method and apparatus to buffer data. A buffer memory of a first type stores data associated with a connection identifier corresponding to a channel in a network. The data is organized into at least one chunk based on a linked list. The connection identifier identifies a connection in the channel. The data is part of a data stream associated with the connection. A packet memory of a second type provides access to the stored data when a transfer condition occurs.

Inventors: 
Chu, Tam-anh
Patent Number: 
US8072996
Technical domain: 
Communications
FIle Date: 
2007-10-25
Grant Date: 
2011-12-06
Grant time: 
1,503 days
Grant time percentile rank: 
27
Claim count percentile rank: 
6
Citations percentile rank: 
2
'Cited by' percentile rank: 
1
Assignee: 
US NAVY

Method and system of an ultra high Q silicon cantilever resonator for thin film internal friction and Young's modulus measurements

Patent image
NRL

This invention provides an extremely accurate way to characterize the Young's modulus of thin film materials with thicknesses in the nanometer range. It takes advantage of a recently developed high Q silicon Young's modulus resonator (YMR), which has a record high quality factor of about fifty million in operation at temperatures below 10 degrees Kelvin (10K). Because of the high Q of the YMR, the temperature stability of the YMR's resonance frequency below 1K, and the extremely high degree of vibration isolation inherent in the inventive design, the relative resolution of the resonant frequency is typically in 2×10−7. This is enough to resolve a resonant frequency shift after a deposition of a thin film onto the sensitive part of the resonator, and to compute the Young's modulus of thin film materials of even a few monolayers thickness.

Inventors: 
Liu, Xiao; Metcalf, Thomas H.
Patent Number: 
US9054640
Technical domain: 
Communications
FIle Date: 
2013-06-27
Grant Date: 
2015-06-09
Grant time: 
712 days
Grant time percentile rank: 
13
Claim count percentile rank: 
6
Citations percentile rank: 
1
'Cited by' percentile rank: 
1
Assignee: 
US NAVY

Smart synchro generator unit

Patent image
NSWCCD

The present invention is typically embodied as a portable handheld unit that generates synchro signals for input into synchro motors and other synchro devices. A primary genre of inventive application is the testing of hardware and software in synchro systems. The inventive unit typically includes a numeric keypad, an LCD display, a microcontroller, a serial-to-parallel binary data converter, and at least one digital-to-synchro converter. The keypad and display are used to enter decimal data. The microcontroller converts the decimal data to serial binary data. The serial-to-parallel binary data converter converts the serial binary data to parallel binary data. The digital-to-synchro converter(s) convert(s) the parallel binary data to synchro analog data. Some inventive embodiments implement plural digital-to-synchro converters individually corresponding to channels for independently outputting synchro signals. Each channel can represent a specific type of synchro operation, e.g., ship rudder angle, ship speed, ship engine shaft revolution, ship heading, etc.

Inventors: 
Patel, Bhavesh V.
Patent Number: 
US8797195
Technical domain: 
Communications
FIle Date: 
2013-05-30
Grant Date: 
2014-08-05
Grant time: 
432 days
Grant time percentile rank: 
7
Claim count percentile rank: 
6
Citations percentile rank: 
2
'Cited by' percentile rank: 
1
Assignee: 
US NAVY

Dual band superheterodyne receiver

Patent image
NRL

A MMIC based superheterodyne receiver for converting at RF energy in an upper and a lower frequency band includes at least one attenuator for the RF energy input, a mixer for mixing the lower band input with a LO1 signal, another mixer for mixing the upper band input with the LO1 signal signal, a switch to direct the LO1 signal to the first mixer or to the second mixer, and a third mixer for mixing a LO2 signal with the first stage mixer output to produce a signal at the output frequency. Passband filters at the outputs of the mixers can reject interfering mixer-generated frequencies. Input frequency range can span 0.1 to 18 GHz with a 160 MHz or 1 GHz output. A modular receiver can have two or more converter modules for each LO module. The receiver can receive antenna input directly, without pre-mixing filtering or attenuating.

Inventors: 
Goodman, Daniel J.
Patent Number: 
US7027833
Technical domain: 
Communications
FIle Date: 
2004-04-02
Grant Date: 
2006-04-11
Grant time: 
739 days
Grant time percentile rank: 
13
Claim count percentile rank: 
15
Citations percentile rank: 
3
'Cited by' percentile rank: 
2
Assignee: 
US NAVY

Method of designing a low cost multibeam phased array antenna for communicating with geostationary satellites

Patent image
NRL

A method for electronically scanning a predetermined geostationary orbital arc segment around the earth with an antenna system. The antenna system includes a planar array. A number of fixed electronic squints is selected. Lengths of the total plurality of fixed delay line lengths are generated for the planar array based on the number of fixed electronic squints. All of the antenna elements in the planar array for the mobile earth station are fitted with the generated lengths. The orbital arc segment is electronically scanned with a single linear scan with the planar array. This method is extendable to the case of multiple beams by adding additional phase shifters at each column and keeping the number of fixed line lengths the same, regardless of the number of additional beams.

Inventors: 
Rao, Jaganmohan B. L.; Mital, Rashmi; Patel, Dharmesh P.; Parent, Mark G.; Tavik, Gregory C.
Patent Number: 
US7656351
Technical domain: 
Communications
FIle Date: 
2008-01-04
Grant Date: 
2010-02-02
Grant time: 
760 days
Grant time percentile rank: 
13
Claim count percentile rank: 
2
Citations percentile rank: 
1
'Cited by' percentile rank: 
1
Assignee: 
US NAVY

Method and apparatus for conservative motion estimation from multi-image sequences with optimized motion compensation

Patent image
NRL

Apparatus and methods are presented for estimating the velocity field based on a multi-image frame sequence having an integer number M frames, M is greater than two, in which a set of M−1 displaced frame difference (DFD) equations is solved including a motion compensated prediction (MCP) equation, M−2 motion compensated interpolation (MCI) equations for solving a velocity field at a first time using a set of iteration equations to determine a velocity field, and 2×(M−2) conservative velocity constraint (CVC) equations for solving a velocity field at times t2, . . . , tM−1.

Inventors: 
Chen, Wei
Patent Number: 
US8666120
Technical domain: 
Communications
FIle Date: 
2011-12-13
Grant Date: 
2014-03-04
Grant time: 
812 days
Grant time percentile rank: 
14
Claim count percentile rank: 
5
Citations percentile rank: 
2
'Cited by' percentile rank: 
1
Assignee: 
US NAVY

Method of synchronization without broadcasting synchronization signal

Patent image
NSA

A method of synchronizing stations without broadcasting a synchronization signal. Presetting an environmental variable into each station prior to deploying the stations. Presetting an interval of time into each station prior to deployment. Deploying the stations. Waiting the interval of time. Measuring the environmental variable at each station. Returning to the fourth step if the measurement is not within a first user-definable range. Returning to the fifth step if the measurement is not within a second user-definable range. Synchronizing a clock within the station to the time that a synchronization event is measured, and returning to the fourth step.

Inventors: 
Gregory, Machon B.; Schuett, Angela M.
Patent Number: 
US7227858
Technical domain: 
Communications
FIle Date: 
2005-04-07
Grant Date: 
2007-06-05
Grant time: 
789 days
Grant time percentile rank: 
14
Claim count percentile rank: 
2
Citations percentile rank: 
1
'Cited by' percentile rank: 
1
Assignee: 
NATIONAL SECURITY AGENCY

Through the bulkhead repeater

Patent image
NSWCCD

A method and apparatus for transmitting radio frequency signals and associated information through a plurality of compartments and associated bulkhead walls in a water vessel. The method and apparatus includes a through-the-bulkhead repeater system, in which one or more bi-directional repeater units are mounted on bulkhead walls in each compartment. The bi-directional units communicate with each other to transfer signals throughout the vessel. In operation, a bi-directional unit converts radio frequency signals into energy forms such as ultrasonic waves, which are propagated from one compartment to an adjacent compartment through the thick bulkhead walls. The propagated energy forms are received in the adjacent compartment by another bi-directional unit, which eventually converts the energy form into an output radio frequency signal, which is then transmitted by the bi-directional unit.

Inventors: 
Ortiz, Albert; Dalessandro, Donald; Dong, Qing
Patent Number: 
US7760585
Technical domain: 
Communications
FIle Date: 
2007-07-26
Grant Date: 
2010-07-20
Grant time: 
1,090 days
Grant time percentile rank: 
20
Claim count percentile rank: 
6
Citations percentile rank: 
1
'Cited by' percentile rank: 
1
Assignee: 
US NAVY

Method and apparatus for tracking a frequency-hopped signal

Patent image
ARL

A frequency hopping signal receiving system comprising: a receiver for extracting discrete-time samples from the signal; a memory connected to the receiver for storing the extracted discrete-time samples from the signal; at least one processor operatively connected to the memory for: determining a state-space vector that captures relevant information to describe the dynamics of the signal; selecting a parameter to represent the probability of hopping associated with the signal; generating particle filters to estimate unknown parameters in the state-space vector based upon the extracted discrete-time samples by generating random particles that approximate the filtering distribution having importance weights; specifying the importance function in closed-form in a convenient mixture representation, which enables drawing particles and updating the importance weights; constructing an estimator to generate hop particles based upon observing at least one sample hop and then evaluating the estimator using a conditional expected value; using a spectrogram to generate particles in conjunction with an importance function; and estimating the hop frequency, hop time, and amplitude parameters, and a method thereof.

Inventors: 
Tsakonas, Efthimios E.; Sidiropoulos, Nikolaos D.; Swami, Ananthram
Patent Number: 
US8599901
Technical domain: 
Communications
FIle Date: 
2010-04-05
Grant Date: 
2013-12-03
Grant time: 
1,338 days
Grant time percentile rank: 
24
Claim count percentile rank: 
4
Citations percentile rank: 
1
'Cited by' percentile rank: 
1
Assignee: 
US ARMY

Smart antenna method

Patent image
NAWCAD

An automated, computational, software tool for adaptable, real-time configuration of Live to Virtual (L-V) tactical communications for continuous training environments. In these types of cosite environments, this tool de-conflicts mutual interfering frequencies of antenna pairs against required antenna isolation, thus eliminating the need for expensive couplers and frequency confining tunable filters.

Inventors: 
Richie, Diane; Mccarthy, Peter; Kotick, David
Patent Number: 
US9510215
Technical domain: 
Communications
FIle Date: 
2015-12-17
Grant Date: 
2016-11-29
Grant time: 
348 days
Grant time percentile rank: 
6
Claim count percentile rank: 
1
Citations percentile rank: 
1
'Cited by' percentile rank: 
1
Assignee: 
US NAVY

Electro optical scanning multi-function antenna

Patent image
ARL

An multi-beam multifunction electro optical scanning antenna having a first variable wavelength tunable laser having an output wavelength variable within a first range and a second variable wavelength tunable laser having an output wavelength variable within a second range, different from the first range. The outputs from both lasers are modulated by independent microwave sources and the modulated outputs from both lasers are combined by an optical combiner into a combined output signal. An antenna array includes a plurality of radiators and a photodetector is associated with each radiator which converts the combined optical output from the lasers to microwave signals. Beam splitters divide the combined output signals to each of the antenna radiators while first and second wavelength-dependent time delay elements are optically connected in series between each sequential beam splitter. Each first time delay element is operable within the first wavelength range, while each second time delay element is operable within the second wavelength range. The antenna can generate two or more RF microwave beams simultaneously and independently scan/steer them.

Inventors: 
Zhou, Weimin
Patent Number: 
US7609971
Technical domain: 
Communications
FIle Date: 
2005-12-02
Grant Date: 
2009-10-27
Grant time: 
1,425 days
Grant time percentile rank: 
26
Claim count percentile rank: 
3
Citations percentile rank: 
1
'Cited by' percentile rank: 
1
Assignee: 
US ARMY

Phase tracking multichannel link

Patent image
NRL

A phase tracking multichannel apparatus includes a plurality of optical transmitters, an optical multiplexer, a common optical link, and a user electronics. RF signals having different phases are received and are output on separate RF channels, each of which is coupled to an optical transmitter. RF-modulated optical output signals are then output to the optical multiplexer to produce a multiplexed output signal. The multiplexed signal is applied to a common optical link that at its output substantially maintains the phase separation of RF modulation components on optical carriers as received at its input. The optical output of the common optical link is then applied to an optical signal receiving system, such as an optical demultiplexer and a plurality of photodetectors. By multiplexing all of the optical signals onto the common optical fiber, all signals transmit the same path and, therefore, have the same time and phase delay. The phase tracking is preserved because all of the signals experience the same optical or expansive properties of the common optical fiber. A typical use would be to transmit multiple RF signals from an antenna array to a remote RF phase measuring receiver, such as a RF direction finding system.

Inventors: 
Reynolds, Timothy N.; Alexander, Edward M.; Spezio, Anthony E.
Patent Number: 
US7024120
Technical domain: 
Communications
FIle Date: 
2002-03-29
Grant Date: 
2006-04-04
Grant time: 
1,467 days
Grant time percentile rank: 
27
Claim count percentile rank: 
4
Citations percentile rank: 
1
'Cited by' percentile rank: 
1
Assignee: 
US NAVY

Device for and method of making element appear in shortest network path by minimal decrements and increments

Patent image
NSA

A device and method of minimally incrementing and decrementing the weights of a minimal number of links in a network to cause a link/node that is not in the shortest path in the network to be in the shortest path by determining the shortest path with link/node, identifying links in this path that are not in the shortest path without link/node, decrementing identified links to make the path the shortest path, identifying a link in the shortest path without link/node not in the path with link/node, incrementing the link, redoing these steps to determine a number of links and modifications to links that would cause the link/node to appear in the shortest path, identifying the set of links and modifications with the fewest links, and modifying the network in accordance with the identified set.

Inventors: 
Bhandari, Ramesh
Patent Number: 
US8233397
Technical domain: 
Communications
FIle Date: 
2011-02-28
Grant Date: 
2012-07-31
Grant time: 
519 days
Grant time percentile rank: 
9
Claim count percentile rank: 
5
Citations percentile rank: 
1
'Cited by' percentile rank: 
1
Assignee: 
US DIRECTOR NAT SECURITY AGENC

System and method for interactive spatio-temporal streaming data

Patent image
NRL

System and method for providing a probabilistic order of tiles relative to a current section of a video that a user is viewing. A cache implementation uses this ordering to decide what tiles to evict from the cache, i.e. which tiles will probably not be accessed within a particular timeframe, but not when to evict (this is up to the cache implementation). A cache implementation can also use the prioritized list of the present embodiment to pre-fetch tiles.

Inventors: 
Michael, Christopher J.; Lin, Bruce Y.; Ioup, Elias Z. K.; Sample, John T.
Patent Number: 
US9027067
Technical domain: 
Communications
FIle Date: 
2013-09-30
Grant Date: 
2015-05-05
Grant time: 
582 days
Grant time percentile rank: 
10
Claim count percentile rank: 
1
Citations percentile rank: 
1
'Cited by' percentile rank: 
1
Assignee: 
US NAVY

Method and system for compression of hyperspectral or multispectral imagery with a global optimal compression algorithm (GOCA)

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NRL

A computer based method and system for compressing digital hyperspectral or multispectral image data. The method includes initially reducing the plurality of spectral bands of the hyperspectral data to a smaller number of spectral bands using principal component analysis, determining an optimum compression ratio for each of the smaller number of spectral bands for use in a wavelet transform, and subsequently compressing the smaller number of spectral bands spatially using the wavelet transform with the optimum compression ratios.

Inventors: 
Chen, Wei
Patent Number: 
US8432974
Technical domain: 
Communications
FIle Date: 
2010-07-12
Grant Date: 
2013-04-30
Grant time: 
1,023 days
Grant time percentile rank: 
18
Claim count percentile rank: 
3
Citations percentile rank: 
1
'Cited by' percentile rank: 
1
Assignee: 
US NAVY

Cryptographic key exchange method using efficient elliptic curve

Patent image
NSA

A method of exchanging a cryptographic key between two users that includes the steps of selecting a value p from p=(2dk−2ck−1)/r, p=(2dk−2(d−1)k+2(d−2)k− . . . −2k+1)/r, p=(2dk−2ck−1)/r, p=(2dk−2ck+1)/r, and p=(24k−23k+22k+1)/r; selecting an elliptic curve E and an order q; selecting a base point G on the elliptic curve E, where G is of order q; generating a private key w; generating a public key W=wG; distributing p, E, q, G, and Win an authentic manner; agreeing on p, E, q, G, W1, and W2, where W1 is the public key of a first user, and where W2 is the public key of a second users; each users generating a private integer; each users multiplying G by that user's private integer using a form of p agreed upon; each user transmitting the result of the last step to the other user; each users combining that user's private integer and public key with the other user's result of the tenth step and public key using the form of p agreed upon to form a common secret point between the users; and each user deriving the cryptographic key from the common secret point.

Inventors: 
Solinas, Jerome Anthony
Patent Number: 
US6993136
Technical domain: 
Communications
FIle Date: 
2001-08-09
Grant Date: 
2006-01-31
Grant time: 
1,636 days
Grant time percentile rank: 
30
Claim count percentile rank: 
1
Citations percentile rank: 
1
'Cited by' percentile rank: 
1
Assignee: 
NATIONAL SECURITY AGENCY

Wide-band active antenna system for HF/VHF radio reception

Patent image
NRL

An active antenna system for receiving electromagnetic radiation at frequencies below 100 MHz. The system includes a vertical support mast; a front end electronics unit including an active balun, the front end electronics unit affixed to the support mast; two crossed-dipole antennas affixed oriented at about 90 degrees to each other, each crossed-dipole antenna having two arms formed of electrically conductive material, each arm having an isoceles triangular frame with an apex of the frame electrically connected to a feedpoint of the front end electronics unit, each arm also having a longitudinal member extending from the apex to the center of the base of the triangular shape and a cross member extending between sides of the triangular frame. The system can operate independently or as part of a long wavelength array for astronomical radio telescope applications.

Inventors: 
Hicks, Brian C.; Stewart, Kenneth P.; Clarke, Tracy; Dalal, Nagini P.; Schmitt, Henrique; Ray, Paul S.; Burns, Stephen J.; Kassim, Namir E.; Polisensky, Emil J.; Mcglothlin Jr., Norman R.
Patent Number: 
US9225074
Technical domain: 
Communications
FIle Date: 
2013-11-05
Grant Date: 
2015-12-29
Grant time: 
784 days
Grant time percentile rank: 
14
Claim count percentile rank: 
2
Citations percentile rank: 
1
'Cited by' percentile rank: 
1
Assignee: 
US NAVY

Tuning bandwidth and center frequencies in a bandpass filter

Patent image
NRL

A method for independently tuning bandwidth and center frequencies in a bandpass filter. The filter can be configured with a plurality of resonators, wherein the resonators are coupled over a certain coupling region. Additionally, the filter can be configured with a plurality of tuning elements. For each of the inter-resonator couplings, at least one of the resonators associated with the inter-resonator coupling can have a first tuning element placed at a first location on the resonator and a second tuning element placed at a second location on the resonator. Simultaneously tuning the first and second tuning elements can adjust the center frequency, and offset tuning the first and second tuning elements can adjust the bandwidth frequency.

Inventors: 
Guyette, Andrew C.
Patent Number: 
US9225051
Technical domain: 
Communications
FIle Date: 
2011-09-28
Grant Date: 
2015-12-29
Grant time: 
1,553 days
Grant time percentile rank: 
28
Claim count percentile rank: 
3
Citations percentile rank: 
1
'Cited by' percentile rank: 
1
Assignee: 
US NAVY

AIS demodulator for unknown carrier phase and baud alignment

Patent image
NSA

A method of demodulating an AIS signal by receiving the signal, sampling the signal, estimating the carrier frequency, estimating the complex conjugate of the carrier frequency contribution to each sample, multiplying each sample by the complex conjugate and calling the results a base-banded sampled signal (BBSS), correlating the BBSS with known preambles, identifying a maximum magnitude of the BBSS/preamble correlation and its location and the associated preamble, computing a complex inner product of the preamble with a segment of the BBSS, estimating the carrier phase as an argument function of the eighth step result, estimating a complex conjugate of the carrier phase contribution to the BBSS, multiplying each fifth step result starting at the location of the maximum magnitude of the BBSS/preamble correlation by the tenth step result, and demodulating the results starting at that location.

Inventors: 
Smith, David C.
Patent Number: 
US8665997
Technical domain: 
Communications
FIle Date: 
2011-02-24
Grant Date: 
2014-03-04
Grant time: 
1,104 days
Grant time percentile rank: 
20
Claim count percentile rank: 
5
Citations percentile rank: 
1
'Cited by' percentile rank: 
1
Assignee: 
US DIRECTOR THE NAT SECURITY A

System and method for broadband signal disambiguation based on sub-sampled analog optical links employing sample rate modulation

Patent image
NRL

A system for measuring an RF input signal frequency includes a sampling optical pulse train with a frequency-dithered repetition-rate, and a sub-sampled analog link coupled to the optical pulse train whereby the RF input signal frequency is determined. This frequency dither imparts well-characterized modulation sidebands onto the input RF signal to be measured. By measuring the amplitude of these sidebands relative to the incoming aliased signal amplitude the frequency of the original signal is readily determined. The use of optical sampling dramatically increases the bandwidth over which the disambiguation technique is applied, and coarse disambiguation is achieved in a single acquisition.

Inventors: 
Mckinney, Jason D.; Harmon, Sharon R.
Patent Number: 
US9467223
Technical domain: 
Communications
FIle Date: 
2015-09-22
Grant Date: 
2016-10-11
Grant time: 
385 days
Grant time percentile rank: 
6
Claim count percentile rank: 
2
Citations percentile rank: 
1
'Cited by' percentile rank: 
1
Assignee: 
US NAVY

Drift tube amplifier and method to amplify current

Patent image
NAWCAD

A drift tube amplifier having an input and an output. The drift tube amplifier including a current-to-voltage converter for converting input current to a voltage, a band pass filter assembly for reducing unwanted noise within the voltage, a voltage controlled amplifier for adjusting the output voltage level, and a logarithmic ratio converter for converting the voltage from linear to LOG scale.

Inventors: 
Hamilton, Brett J.
Patent Number: 
US7573572
Technical domain: 
Communications
FIle Date: 
2005-09-07
Grant Date: 
2009-08-11
Grant time: 
1,434 days
Grant time percentile rank: 
26
Claim count percentile rank: 
3
Citations percentile rank: 
1
'Cited by' percentile rank: 
1
Assignee: 
US NAVY

Device for and method of identifying minimum candidate codewords for list decoder

Patent image
NSA

A device and method of determining candidates to decode by receiving a message, selecting m, identifying m voltages in message near zero volts, generating binary version of message, generating candidates that are variations of the binary message by varying the m positions, multiplying a modified binary message by the parity check matrix of the message, generating a matrix of the rows of the parity check matrix corresponding to the m positions, determining a rank v of the matrix, eliminating rows that are not linearly independent, determining if the sixth step result is in a span of the ninth step result, if so then there are 2m-1-2m-v(m−1) candidates, where the candidates can multiply the seventh step result to get the sixth step result and candidates with odd weights more than one Hamming distance from the candidates, otherwise there are 2m-1 candidates having odd weight.

Inventors: 
York, Eric V.
Patent Number: 
US8397146
Technical domain: 
Communications
FIle Date: 
2011-03-25
Grant Date: 
2013-03-12
Grant time: 
718 days
Grant time percentile rank: 
13
Claim count percentile rank: 
1
Citations percentile rank: 
1
'Cited by' percentile rank: 
1
Assignee: 
US DIRECTOR OF THE NATIONAL SE

Information transmitter with variable pulse width encoding

Patent image
NSWCDD

A communication device is provided for transmitting information incorporated into at least one message packet. The device includes components for encoding the message packet as a signal, which is afterwards transmitted and analyzed. The encoder assigns the message packet to correspond to a specific pulse width. The transmitter sends the signal across a channel. The processor parses the signal as corresponding to the specific pulse width subsequently decoded to obtain the message packet.

Inventors: 
Huttle, William M.
Patent Number: 
US8891355
Technical domain: 
Communications
FIle Date: 
2013-04-30
Grant Date: 
2014-11-18
Grant time: 
567 days
Grant time percentile rank: 
10
Claim count percentile rank: 
2
Citations percentile rank: 
1
'Cited by' percentile rank: 
1
Assignee: 
US NAVY

Method of elliptic curve cryptographic key agreement using coefficient splitting

Patent image
NSA

A method of generating a cryptographic key in an authenticated manner using coefficient splitting. Select a prime number p and an elliptic curve of either a first class or a second class. Select a point P. The first user generates ra, wa, and Ra=raP and Wa=waP via coefficient splitting. The second user generates rb, wb, and Rb=rbP and Wb=wbP via coefficient splitting. After the users have exchanged the points Ra, Wa, Rb, Wb, the first user generates ca, ga, and caWb, and gaRb via coefficient splitting, and the second user generates cb, gb, and cbWa and gbRa via coefficient splitting. Each user then sums the corresponding results to form K and derives the cryptographic key from K in the same user-definable manner. An unauthenticated key exchange method is also presented.

Inventors: 
Solinas, Jerome A.
Patent Number: 
US7062044
Technical domain: 
Communications
FIle Date: 
2002-06-28
Grant Date: 
2006-06-13
Grant time: 
1,446 days
Grant time percentile rank: 
26
Claim count percentile rank: 
8
Citations percentile rank: 
1
'Cited by' percentile rank: 
2
Assignee: 
NATIONAL SECURITY AGENCY

Intermodulation distortion reduction methodology for high temperature superconductor microwave filters

Patent image
NSWCCD

Intermodulation distortion (IMD) is known to be an impediment to progress in superconductor-based filter technology. The present invention's methodology for reducing IMD can open doors to heretofore unseen practical applications involving high temperature superconductor (HTS) filters. Typical inventive practice includes (a) increasing the thickness d, and/or (b) changing the operation temperature T, of the filter's HTS film. The film's thickness d is increased in such a way as to decrease the IMD power PIMD in accordance with the material-independent proportionate relationship PIMD∝1/d1.5-6. The film's operation temperature T is bettered or optimized in accordance with the material-independent proportionate relationship PIMD∝(λO(T))10(K(2)(T))2/(ΔO(T))6, and further in accordance with three individual material-dependent relationships, namely, between operation temperature T and each of linear penetration depth λO, gap maximum ΔO, and kernel K(2). Some inventive embodiments include oxygen overdoping of the film as an additional/alternative IMD-reductive measure.

Inventors: 
Agassi, Yehoshua Dan; Oates, Daniel E.
Patent Number: 
US7761125
Technical domain: 
Communications
FIle Date: 
2005-09-27
Grant Date: 
2010-07-20
Grant time: 
1,757 days
Grant time percentile rank: 
32
Claim count percentile rank: 
4
Citations percentile rank: 
1
'Cited by' percentile rank: 
1
Assignee: 
US NAVY

Collaborative development network for widely dispersed users and methods therefor

Patent image
NSWCDD

A White Board system permitting a plurality of users to collaborate with one another irrespective of the respective user's hardware platform or operating system, includes a server computer, and a plurality of client computers coupled to the server computer. Preferably, each of the client computers logs into the server computer and is thereby assigned a unique identifier, each of the client computers includes a graphical user interface (GUI) which selectively displays any combination of objects having active content, active hyperlinks, and text, each of the client computers transmits user-generated objects to the server computer for selective retransmission to respective one of the client computers, the server selectively controls transmission of all user-generated objects to respective ones of the computers responsive to the respective assigned identifier, and the server commands one of the client computers to update a new client computer when the new client computer logs into the server. A method for operating a computer network to facilitate collaboration between users and software for implementing the method are also described.

Inventors: 
Simonoff, Adam J.
Patent Number: 
US7043529
Technical domain: 
Communications
FIle Date: 
2000-04-17
Grant Date: 
2006-05-09
Grant time: 
2,213 days
Grant time percentile rank: 
40
Claim count percentile rank: 
7
Citations percentile rank: 
4
'Cited by' percentile rank: 
12
Assignee: 
US NAVY

Single-power dual-polarity Marx bank circuit

Patent image
NSWCDD

A high voltage circuit is provided for electrical pulse generation. The circuit includes an input voltage supply, a ground potential, a difference load, inverting and non-inverting Marx bank circuits connected respectively to output voltage nodes. The voltage supply has positive and negative terminals, with ground connecting to the voltage supply at the negative terminal. The output voltage nodes connect to the load. The inverting Marx bank circuit has a first n-plurality of stages in parallel, connecting at a first stage to the positive terminal and at a last stage at the inverting output node. The non-inverting Marx bank circuit has a second plurality of stages in parallel, connecting at a first stage to the positive terminal and at a last stage at the non-inverting output node. The load combines the inverting output voltage of minus n-times the input voltage with the non-inverting output voltage of plus n-times the input voltage for a total of 2n-times the input voltage.

Inventors: 
Camp, James Thomas
Patent Number: 
US9300280
Technical domain: 
Communications
FIle Date: 
2013-10-16
Grant Date: 
2016-03-29
Grant time: 
895 days
Grant time percentile rank: 
16
Claim count percentile rank: 
1
Citations percentile rank: 
1
'Cited by' percentile rank: 
1
Assignee: 
US NAVY

Cryptographic identification and digital signature method using efficient elliptic curve

Patent image
NSA

A method of identifying user, generating digital signature, and verifying digital signature by selecting a modulus p in the form of p=(2dk−2ck−1)/r, p=(2dk−2(d−1)k+2(d−2)k− . . . −2k+1)/r, p=(2dk−2ck−1)/r, p=(2dk−2ck+1)/r, and p=(24k−23k+22k+1)/r, selecting an elliptic curve E and an order q; selecting a basepoint G; generating a private key w; generating a public key W=wG; distributing p, E, q, G, and W to at least a prover, a verifier, and a signer; generating the prover's private key wp and public key Wp=wpG; retrieving the prover's public key Wp; generating a private integer kp; combining kp and G to form K using p; sending K to the verifier; sending a challenge integer c to the prover; combining c, kp, and wp to form a response integer v; sending v to the verifier; combining cG, K, and Wp using p and checking to see if the combination is equal to vG. If not so, stop. Otherwise, generating, by the signer, the signer's private key ws; generating a private integer ks; combining ks and G to form K using p; combining K and a message M to form an integer h; combining h, ks, and ws to form an integer s; sending M and (K,s) as a digital signature of M; retrieving Wp; receiving M and (K,s); combining K and M to form an integer h; and combining h, K, and Wp using p and checking to see if the combination is equal to sG. If so, the digital signature is verified.

Inventors: 
Solinas, Jerome Anthony
Patent Number: 
US6898284
Technical domain: 
Communications
FIle Date: 
2001-08-09
Grant Date: 
2005-05-24
Grant time: 
1,384 days
Grant time percentile rank: 
25
Claim count percentile rank: 
2
Citations percentile rank: 
1
'Cited by' percentile rank: 
2
Assignee: 
NATIONAL SECURITY AGENCY

Range limited antenna

Patent image
NSA

Range limited antenna includes first and second pair of antenna elements, and an RF signal processing network connected to both pair of antenna elements. The network has a function, F(Ξ,x)≈ΦA(x)−ΦB(x), where x is a signal, ΦA(x) is the phase angle of signal x at the first element pair, ΦB(x) is the phase angle of signal x at the second element pair, and Ξ contains all additional parameters which bear on the system. The network is configured to pass a signal for which F(Ξ,x)>ε, where ε is a threshold amount, such that the antenna has gain to signals within a radius and has attenuation outside the radius.

Inventors: 
Althouse, Mark L. G.
Patent Number: 
US7292202
Technical domain: 
Communications
FIle Date: 
2005-11-02
Grant Date: 
2007-11-06
Grant time: 
734 days
Grant time percentile rank: 
13
Claim count percentile rank: 
3
Citations percentile rank: 
1
'Cited by' percentile rank: 
1
Assignee: 
NATIONAL SECURITY AGENCY

Method of collision-free hashing for near-match inputs

Patent image
NSA

A method of collision-free hashing of near-match by selecting bit positions d that differ between a first input and a second input, selecting a degree of a first polynomial for a cyclic code proportional to d, selecting a bit length i of the first input and the second input, selecting a bit length cv of a check value greater than or equal to d, setting n>=i+cv, generating the first polynomial that divides xn+1, factoring the first polynomial into a second and a third polynomials, receiving the first input, dividing the first input by the second polynomial, dividing the first input by the third polynomial, and identifying the results of the last two steps as a hash of the first input.

Inventors: 
Newhart, Donald W.
Patent Number: 
US8355501
Technical domain: 
Communications
FIle Date: 
2012-02-03
Grant Date: 
2013-01-15
Grant time: 
347 days
Grant time percentile rank: 
6
Claim count percentile rank: 
2
Citations percentile rank: 
1
'Cited by' percentile rank: 
1
Assignee: 
US DIRECTOR NAT SECURITY AGENC

Infinite impulse response resonator digital filter

Patent image
NSA

The IIR resonator digital filter which is the subject of this patent invention comprises a first register having a plurality of inputs and outputs, a multiplexer/demultiplexer having a plurality of inputs and outputs, a first multiplier having a plurality of inputs and an output, a second multiplier having a plurality of inputs and an output, a third multiplier having a plurality of inputs and an output, an adder having a plurality of inputs and an output, a subtractor having a plurality of inputs and an output, and a second register having an input and a plurality of outputs. The IIR resonator digital filter features a multiplexer/demultiplexer that has five logical states.

Inventors: 
Sinutko, Michael
Patent Number: 
US8396912
Technical domain: 
Communications
FIle Date: 
2010-08-05
Grant Date: 
2013-03-12
Grant time: 
950 days
Grant time percentile rank: 
17
Claim count percentile rank: 
1
Citations percentile rank: 
1
'Cited by' percentile rank: 
1
Assignee: 
US NATIONAL SECURITY AGENCY

Device for and method of multilevel chain of trust/revision

Patent image
NSA

A device and method of multilevel chain of trust/revision by certifying each user, device, action, and circumstance in the creation, modification, and transmission of computer information, including a revision history of any modification.

Inventors: 
Alexander, Keith B.; Dowd, Patrick W.
Patent Number: 
US9467298
Technical domain: 
Communications
FIle Date: 
2014-03-19
Grant Date: 
2016-10-11
Grant time: 
937 days
Grant time percentile rank: 
17
Claim count percentile rank: 
4
Citations percentile rank: 
1
'Cited by' percentile rank: 
1
Assignee: 
NATIONAL SECURITY AGENCY

Piezoelectric in-line RF MEMS switch and method of fabrication

Patent image
ARL

A MEMS switch and method of fabrication comprises a RF transmission line; a RF beam structure comprising a RF conductor; a cantilevered piezoelectric actuator coupled to the RF beam structure; a plurality of air bridges connected to the cantilevered piezoelectric actuator; and a plurality of contact dimples on the pair on the RF beam structure. The RF transmission line comprises a pair of co-planar waveguide ground planes flanking the RF conductor; and a plurality of ground straps, wherein the RF transmission line is operable to provide a path along which RF signals propagate. The cantilevered piezoelectric actuator comprises a dielectric layer connected to the RF beam structure; a bottom electrode connected to the dielectric layer; a top electrode; and a piezoelectric layer in between the top and bottom electrodes, wherein the top electrode is offset from an edge of the piezoelectric layer and the bottom electrode.

Inventors: 
Pulskamp, Jeffrey S.; Polcawich, Ronald G.; Judy, Daniel C.
Patent Number: 
US7518474
Technical domain: 
Communications
FIle Date: 
2006-02-06
Grant Date: 
2009-04-14
Grant time: 
1,163 days
Grant time percentile rank: 
21
Claim count percentile rank: 
7
Citations percentile rank: 
1
'Cited by' percentile rank: 
1
Assignee: 
US ARMY

Self-Authenticating cryptographic apparatus

Patent image
NSA

A self-authenticating apparatus for effecting secure communication of a binary signal. In the encipherment apparatus, key is generated as a function of plain text summed with a pseudorandom linear sequence. The decipherment apparatus performs a reverse function in an autokey mode. Incoming cipher text is summed with generated key to create a plain text stream. As in the encipherment device, key is generated as a function of the resulting plain text summed with a pseudorandom linear sequence.

Inventors: 
Palmatier, Thomas E.
Patent Number: 
US6912284
Technical domain: 
Communications
FIle Date: 
1983-06-13
Grant Date: 
2005-06-28
Grant time: 
8,051 days
Grant time percentile rank: 
97
Claim count percentile rank: 
4
Citations percentile rank: 
1
'Cited by' percentile rank: 
2
Assignee: 
NATIONAL SECURITY AGENCY

Method of encoding signals with binary codes

Patent image
NSA

A method of encoding a communication signal by selecting a cyclic code, establishing a generator polynomial, generating a polynomial using the generator polynomial, forming a matrix from the generated polynomial, receiving data to be encoded, appending zeros to the received data, calculating a syndrome of the matrix, calculating check values from the syndrome, appending the check values to the received data, and encoding the received data with appended check values using the generator polynomial.

Inventors: 
Newhart, Donald W.
Patent Number: 
US7734991
Technical domain: 
Communications
FIle Date: 
2007-01-04
Grant Date: 
2010-06-08
Grant time: 
1,251 days
Grant time percentile rank: 
23
Claim count percentile rank: 
1
Citations percentile rank: 
1
'Cited by' percentile rank: 
1
Assignee: 
NATIONAL SECURITY AGENCY

Method of spectrum mapping and exploitation using distributed sensors

Patent image
ACERDEC

A method for operating a distributed multi-sensor system for spectrum mapping and signal exploitation. The method includes selecting a plurality of distributed sensors including at least one or more clusters of distributed sensors, sending a request to the plurality of distributed sensors to collect signal snapshot copies, routing the signal snapshot copies or information from the plurality of distributed sensors as inputs to at least one fusion module, processing all inputs before sending any next request to the plurality of distributed sensors, optimizing the one or more clusters of distributed sensors, combining multiple distributed signal inputs in the at least one fusion module, and making a global decision. A system for spectrum mapping and signal exploitation and a storage medium encoded with machine-readable computer code for implementing the method are also disclosed.

Inventors: 
Su, Wei
Patent Number: 
US8755469
Technical domain: 
Communications
FIle Date: 
2012-08-20
Grant Date: 
2014-06-17
Grant time: 
666 days
Grant time percentile rank: 
12
Claim count percentile rank: 
6
Citations percentile rank: 
1
'Cited by' percentile rank: 
1
Assignee: 
US ARMY

Modulation scheme determination through use of multiple sensors

Patent image
ACERDEC

Various embodiments associated with multiple signal editions is described. A plurality of sensors can be deployed in an environment. These sensors can be used to capture a signal of interest (SOI). However, when the signal is weak or difficult to sense, what an individual sensor captures may be of little value. Therefore, multiple sensors can be used together to capture the signal (e.g., different editions of the SOI). Further, it is possible that the demodulation scheme of the signal is not known, such as when the signal is from an unknown network (e.g., a network of an enemy). A mathematical operation can be performed upon signal editions such that a result does not include noise. This result can be used in determining the demodulation scheme of the signal.

Inventors: 
Su, Wei
Patent Number: 
US8917802
Technical domain: 
Communications
FIle Date: 
2013-02-20
Grant Date: 
2014-12-23
Grant time: 
671 days
Grant time percentile rank: 
12
Claim count percentile rank: 
6
Citations percentile rank: 
1
'Cited by' percentile rank: 
1
Assignee: 
US ARMY

Signal modulation scheme determination through an at least fourth-order noise-insensitive cumulant

Patent image
ACERDEC

Various embodiments associated with an at least fourth-order cumulant of a signal are described. The at least fourth-order noise-insensitive cumulant of the signal can be taken and compared against an at least fourth-order noise-insensitive cumulant of known signals. A match can be found between the signal and a known signal and from this match, a demodulation scheme of the signal can be determined. The demodulation scheme can be used to demodulate the signal.

Inventors: 
Su, Wei
Patent Number: 
US9042496
Technical domain: 
Communications
FIle Date: 
2013-02-19
Grant Date: 
2015-05-26
Grant time: 
826 days
Grant time percentile rank: 
15
Claim count percentile rank: 
6
Citations percentile rank: 
1
'Cited by' percentile rank: 
1
Assignee: 
US ARMY

Parameter offset estimation through use of a secondary signal collected from multiple sensors

Patent image
ACERDEC

Various embodiments associated with estimating a parameter offset for editions of a signal of interest through use of a secondary signal are described. A plurality of distributed asynchronous sensors can capture editions of a signal of interest as well as editions of a secondary signal. The secondary signal can be much stronger than the signal of interest. Since individual sensors capture the signal of interest editions and the secondary editions, offset calculated for one can be used for the other. With the secondary signal being stronger than the signal of interest, the offset of the editions of the signal of interest can be estimated. Once the offset is estimated for the secondary editions, the offset can be used for the signal of interest editions. After the offset is used to align the signal of interest editions, the signal of interest editions can be combined and further processing can occur.

Inventors: 
Su, Wei
Patent Number: 
US9178544
Technical domain: 
Communications
FIle Date: 
2013-03-07
Grant Date: 
2015-11-03
Grant time: 
971 days
Grant time percentile rank: 
17
Claim count percentile rank: 
6
Citations percentile rank: 
1
'Cited by' percentile rank: 
1
Assignee: 
US ARMY

Alignment of multiple editions of a signal collected from multiple sensors

Patent image
ACERDEC

Various embodiments associated with synchronization of signal editions from multiple sensors are described. A plurality of sensors can be deployed in an environment. Different copies of a desired signal can be present in the environment and there can be a desire to identify this signal even if the signal is unknown (and a demodulation scheme of the desired signal is not known). The plurality of sensors can sense weak editions of the desired signal and transfer those signals to a master sensor or to a separate location, such as a fusion center. The weak editions may be asynchronous due to the editions being captured at different locations, different channels, different devices, etc. At the master sensor or separate location, the weak editions can be post-synchronized together and then fused together into a strong signal. From the strong signal, a demodulation scheme can be determined and the signal can be demodulated.

Inventors: 
Su, Wei
Patent Number: 
US9438454
Technical domain: 
Communications
FIle Date: 
2013-03-03
Grant Date: 
2016-09-06
Grant time: 
1,283 days
Grant time percentile rank: 
23
Claim count percentile rank: 
6
Citations percentile rank: 
1
'Cited by' percentile rank: 
1
Assignee: 
US ARMY

Protocol reference model, security and inter-operability in a cognitive communications system

Patent image
ACERDEC

Various cognitive communications system architectures and their corresponding Protocol Reference Models (PRMs) are disclosed. Such PRMs incorporate a Cognitive Plane in addition to conventional Data and Management Planes. The additional Cognitive Plane functionality may include, for example, spectrum sensing, spectrum management, geolocation, and security functions. The Cognitive Plane may further include a Policy Engine and a Learning and Reasoning Module. In some embodiments, Management Plane functions may be effectively combined to form a database of primitives (and their respective values) called a Management Information Base (MIB). In addition, techniques are provided by which various components of cognitive and non-cognitive, as well as mesh-enabled and non-mesh-enabled nodes in a network, inter-operate with each other. The architectures allow a Spectrum Manager (or Signal Space Manager) to combine information from various network layers (e.g., PHY/MAC Layers, Spectrum Sensing Function, Geolocation Function, and/or Security Sublayers), and to make informed decisions on spectrum utilization.

Inventors: 
Mody, Apurva N.; Sherman, Matthew J.; Reddy, Ranga; Kiernan, Thomas
Patent Number: 
US8442445
Technical domain: 
Communications
FIle Date: 
2008-08-11
Grant Date: 
2013-05-14
Grant time: 
1,737 days
Grant time percentile rank: 
32
Claim count percentile rank: 
6
Citations percentile rank: 
2
'Cited by' percentile rank: 
2
Assignee: 
US ARMY

Resource allocation in co-existence mode

Patent image
ACERDEC

Techniques are disclosed that allow for resource allocation during situations requiring co-existence in cognitive radios. Even under situations of bandwidth scarcity, the techniques allow various users to be guaranteed quality of service (QoS) by proper distribution and allocation of resources. The techniques allow wireless communication systems to operate in a normal mode and a co-existence mode. In the co-existence mode of operation, sub-frame creation, sharing and zone formation schemes are implemented that enable the existing underlying frame structure to remain intact and inter-operable with the legacy systems and at the same time, provide a guaranteed QoS. The zones effectively create partitions in space, time and frequency, which result in interference avoidance and allow various users in neighboring cells to communicate on the same frequencies.

Inventors: 
Mody, Apurva N.; Reddy, Ranga
Patent Number: 
US8326309
Technical domain: 
Communications
FIle Date: 
2009-03-06
Grant Date: 
2012-12-04
Grant time: 
1,369 days
Grant time percentile rank: 
25
Claim count percentile rank: 
5
Citations percentile rank: 
1
'Cited by' percentile rank: 
2
Assignee: 
US ARMY

Asymptotically optimal modulation classification method for software defined radios

Patent image
ACERDEC

A method for identifying the modulation scheme of a software defined radio in real-time without pilot symbols between transmitters and receivers, includes providing a predetermined look-up table (LUT) in the software-defined radio wherein the LUT is prepared by pre-calculating discrete likelihood ratio test (DLRT) function values; storing the pre-calculated DLRT values in said LUT; and indexing the pre-calculated DLRT values by addresses.

Inventors: 
Su, Wei
Patent Number: 
US8750425
Technical domain: 
Communications
FIle Date: 
2012-05-03
Grant Date: 
2014-06-10
Grant time: 
768 days
Grant time percentile rank: 
14
Claim count percentile rank: 
6
Citations percentile rank: 
1
'Cited by' percentile rank: 
1
Assignee: 
US ARMY

Wireless-channel characterization and equalization

Patent image
ACERDEC

Various embodiments are described that relate to signal distortion for delay and attenuation. A transmission antenna can transmit a baseline signal to a reception antenna and then transmit a test signal to the reception antenna. The baseline signal and test signal can be processed to determine undesirable attenuation and delay coefficients. These coefficients can be transmitted back from the reception antenna to the transmission antenna. Based on these coefficients, a determination can be made on how to modify a signal of interest such that the signal of interest arrives from the transmission antenna to the reception antenna absent the undesirable attenuation and delay coefficients. The transmission antenna can transmit the modified signal of interest such that it arrives at the reception antenna absent the undesirable delay and attenuation coefficients.

Inventors: 
Suarez, John
Patent Number: 
US9287908
Technical domain: 
Communications
FIle Date: 
2014-09-25
Grant Date: 
2016-03-15
Grant time: 
537 days
Grant time percentile rank: 
9
Claim count percentile rank: 
6
Citations percentile rank: 
1
'Cited by' percentile rank: 
1
Assignee: 
US ARMY

Rapid modulation scheme determination for linear digital signals

Patent image
ACERDEC

Various embodiments associated with modulation scheme determination for an unknown signal with noise are described. An unknown signal can have an unknown modulation scheme to a system. In order to determine a modulation scheme to use with the unknown signal, the unknown signal can be compared to a plurality of known signals, with an individual known signal being associated with a particular modulation scheme. A rapid classification method can be used that is less computationally intensive than an average likelihood ratio test method based on the distances between unknown symbols and constellation alphabets of a set of known modulation schemes. Signal to noise ratios before and after classification can be used to check an accuracy of classification and distribution of signal symbols can be used to verify a classification result.

Inventors: 
Su, Wei
Patent Number: 
US9036688
Technical domain: 
Communications
FIle Date: 
2013-07-22
Grant Date: 
2015-05-19
Grant time: 
666 days
Grant time percentile rank: 
12
Claim count percentile rank: 
6
Citations percentile rank: 
1
'Cited by' percentile rank: 
1
Assignee: 
US ARMY

Protocol reference model, security and inter-operability in a cognitive communications system

Patent image
ACERDEC

Various cognitive communications system architectures and their corresponding Protocol Reference Models (PRMs) are disclosed. Such PRMs incorporate a Cognitive Plane in addition to conventional Data and Management Planes. The additional Cognitive Plane functionality may include, for example, spectrum sensing, spectrum management, geolocation, and security functions. The Cognitive Plane may further include a Policy Engine and a Learning and Reasoning Module. In some embodiments, Management Plane functions may be effectively combined to form a database of primitives (and their respective values) called a Management Information Base (MIB). In addition, techniques are provided by which various components of cognitive and non-cognitive, as well as mesh-enabled and non-mesh-enabled nodes in a network, inter-operate with each other. The architectures allow a Spectrum Manager (or Signal Space Manager) to combine information from various network layers (e.g., PHY/MAC Layers, Spectrum Sensing Function, Geolocation Function, and/or Security Sublayers), and to make informed decisions on spectrum utilization.

Inventors: 
Mody, Apurva N.; Sherman, Matthew J.; Mcneil, Kevin; Khuu, Phong; Dudgeon, Dan E.; Reddy, Ranga; Kiernan, Thomas
Patent Number: 
US8437700
Technical domain: 
Communications
FIle Date: 
2008-08-11
Grant Date: 
2013-05-07
Grant time: 
1,730 days
Grant time percentile rank: 
31
Claim count percentile rank: 
7
Citations percentile rank: 
2
'Cited by' percentile rank: 
2
Assignee: 
US ARMY

Dual-tone multi-frequency signal classification

Patent image
ACERDEC

Various embodiments associated with signal classification are described. A repeating signal can be partially corrupted and therefore a receiver can obtain an incomplete signal. In one example, the incomplete signal can have discontinuous unobstructed segments. In order for the receiver to understand the contents of the signal, the receiver can identify repeated information in the discontinuous unobstructed segments. This repeated information can be processed to determine content of the signal. In one embodiment, the signal is a dual-tone multi-frequency (DTMF) signal. The receiver can process the content of the DTMF, such as by employing a set of high and low band pass filters, and can identify a high and low frequency of the DTMF. With the high and low frequencies identified, the receiver can access a look-up table and identify a character indicated by the high and low frequency. The receiver can then use or send out the identified character.

Inventors: 
Su, Wei
Patent Number: 
US8755514
Technical domain: 
Communications
FIle Date: 
2013-09-16
Grant Date: 
2014-06-17
Grant time: 
274 days
Grant time percentile rank: 
4
Claim count percentile rank: 
6
Citations percentile rank: 
1
'Cited by' percentile rank: 
1
Assignee: 
US ARMY

Recovery of DTMF tones in the presence of periodic interference and obstruction

Patent image
ACERDEC

While a dual tone multi-frequency (DTMF) signal can be easily processed if cleanly obtained, difficulties can arise if the DTMF signal is not cleanly obtained. In one example, part of the signal can be cleanly obtained, but part of the signal can be obstructed. In order to determine the content of the DTMF signal the parts that are cleanly obtained can be compared with known DTMF signals, such as DTMF signals that correspond with buttons on a telephone keypad. A classification of a closest matching known DTMF signal can be identified and that classification can be assigned to the partially obtained DTMF signal. Thus, without clearly obtaining the whole DTMF signal a content of the DTMF signal can be ascertained.

Inventors: 
Su, Wei; Karim, Muhammed
Patent Number: 
US9055145
Technical domain: 
Communications
FIle Date: 
2013-08-28
Grant Date: 
2015-06-09
Grant time: 
650 days
Grant time percentile rank: 
11
Claim count percentile rank: 
6
Citations percentile rank: 
1
'Cited by' percentile rank: 
1
Assignee: 
US ARMY

Multi-function smart communication card

Patent image
ACERDEC

Various embodiments are described that relate to a smart card. When not connected to an external system, such as a laptop computer, the smart card can be configured to power itself. Thus, various functions can be practiced on the smart card in absence of connection to the external system. Example functions of the smart card can include user identification and authorization. In addition, the smart card can be configured to distinguish between different users and provide different access levels to different users and/or difference access to containers resident within the smart card. This can be done prior to when the smart card is connected to the external system.

Inventors: 
Toth, William; Fong, Stanley; Lutton, Todd; Shenvi, Uday; Dave, Ghanshyam; Lazzaro, Matthew
Patent Number: 
US9177133
Technical domain: 
Communications
FIle Date: 
2014-07-14
Grant Date: 
2015-11-03
Grant time: 
477 days
Grant time percentile rank: 
8
Claim count percentile rank: 
6
Citations percentile rank: 
1
'Cited by' percentile rank: 
1
Assignee: 
CACI TECH INC

Multiple-frequency signal classification through use of a second-order statistic

Patent image
ACERDEC

A multi-frequency (also known as multiple-frequency) signal, such as a dual-tone signal, can be a repeating signal that indicates a character designated on a keypad. The signal can be processed such that the character is identifiable. This processing can include using first and second-order statistics of the signal to determine an estimated average frequency of the signal. A table can be accessed that lists individual characters of the keypad and specific average frequency values can be associated with the individual characters. The specific average frequency value that is closest to the estimated average frequency can be identified and the character associated with this closest specific average frequency value can be appointed as the character indicated by the signal. Thus, the multi-frequency signal can be classified as communicating the appointed character.

Inventors: 
Su, Wei
Patent Number: 
US9179202
Technical domain: 
Communications
FIle Date: 
2013-09-16
Grant Date: 
2015-11-03
Grant time: 
778 days
Grant time percentile rank: 
14
Claim count percentile rank: 
6
Citations percentile rank: 
1
'Cited by' percentile rank: 
1
Assignee: 
US ARMY

Alignment of signal copies from an asynchronous sensor network

Patent image
ACERDEC

Various embodiments associated with resampling signal copies for asynchronous sensors are described. A plurality of asynchronous sensors that sample signals at different frequencies can be distributed in an area. These sensors can sense a signal of interest for an entity. The sensors can send copies of the signal of interest that they have sensed to a system of the entity for processing. However, since the sensors are asynchronous the copies are sampled at different sampling time periods or sampling frequencies. A specific copy of the signal of interest can be selected from among the copies as a reference to estimate relative sampling frequency offset and the remaining copies can be resampled such that their resampled sampling time period or sampling frequency align with the reference signal. With the copies aligned, combination of the copies occurs and further processing can take place.

Inventors: 
Su, Wei
Patent Number: 
US9426007
Technical domain: 
Communications
FIle Date: 
2013-07-22
Grant Date: 
2016-08-23
Grant time: 
1,128 days
Grant time percentile rank: 
20
Claim count percentile rank: 
6
Citations percentile rank: 
1
'Cited by' percentile rank: 
1
Assignee: 
US ARMY

Multivariate digital camera device and method for generating 2D and 3D pictures of datasets comprised of points in hyperspace

Patent image
AECBC

A multivariate digital camera device and method for generating pictures of datasets comprised of points in hyperspace is provided. The invention may be embodied in an input device, a computer processor, and an output device. The input device may be a keyboard, a laboratory instrument such as a mass spectrometer, a reader of computer readable medium, or a network interface device. The output device may be a monitor used in conjunction with either a 2D or 3D printer or both. The computer processor receives data from the input device and performs a series of steps to create a 2D or 3D image of the hyperspace object. The resulting image is then produced in a non-transitory medium by at least one of the output devices. The processor steps include the use of a maximum distance method in which distances and angles information from the points in the hyperspace dataset are preserved to produce a more picture-like quality.

Inventors: 
Maswadeh, Waleed M.; Snyder, Arnold P.
Patent Number: 
US8982131
Technical domain: 
Communications
FIle Date: 
2013-03-14
Grant Date: 
2015-03-17
Grant time: 
733 days
Grant time percentile rank: 
13
Claim count percentile rank: 
2
Citations percentile rank: 
1
'Cited by' percentile rank: 
1
Assignee: 
UNITED STATES OF AMERICA

System and method for short range wireless communication

Patent image
AMRMC

A magnetic induction data transmission network comprising a master hub, at least one sensor node communicatively coupled to the master hub and a magnetic induction coil preferably adapted to be worn about a body part of a subject such as an individual's waist or neck. In at least one embodiment of the invention, the magnetic induction coil preferably includes a connector which serves as an intermediary between the coil and the hub to allow data communication.

Inventors: 
Hoyt, Reed W.; Lanza, John F.
Patent Number: 
US8275318
Technical domain: 
Communications
FIle Date: 
2011-02-16
Grant Date: 
2012-09-25
Grant time: 
587 days
Grant time percentile rank: 
10
Claim count percentile rank: 
4
Citations percentile rank: 
2
'Cited by' percentile rank: 
1
Assignee: 
US ARMY

Method and apparatus for macro photographic stereo imaging

Patent image
AMRMC

A macro photographic apparatus for creating focus stacked images of a specimen may include a rigid longitudinal member having a longitudinal axis and including a camera mount thereon. A translation device may be fixed to the member for translating the specimen along the member toward and away from the camera mount. A rotation device may be mounted on the translation device. The rotation device may support the specimen and enable rotation of the specimen around first and second axes that are perpendicular to the longitudinal axis of the member. At any single position of the translation device along the longitudinal axis of the member, as the specimen is rotated around the first and second axes, the spatial location of the specimen remains substantially the same.

Inventors: 
Gutierrez, Anthony
Patent Number: 
US9253472
Technical domain: 
Communications
FIle Date: 
2015-03-25
Grant Date: 
2016-02-02
Grant time: 
314 days
Grant time percentile rank: 
5
Claim count percentile rank: 
4
Citations percentile rank: 
1
'Cited by' percentile rank: 
1
Assignee: 
US ARMY

Systems and methods for short range wireless communication

Patent image
AMRMC

A magnetic induction data transmission network comprising a master hub, at least one sensor node communicatively coupled to the master hub and a magnetic induction coil preferably adapted to be worn about a bodypart of a subject such as an individual's waist or neck. In at least one embodiment of the invention, the magnetic induction coil preferably includes a connector which serves as an intermediary between the coil and the hub to allow data communication.

Inventors: 
Hoyt, Reed W.; Lanza, John F.
Patent Number: 
US7933554
Technical domain: 
Communications
FIle Date: 
2004-12-28
Grant Date: 
2011-04-26
Grant time: 
2,310 days
Grant time percentile rank: 
42
Claim count percentile rank: 
5
Citations percentile rank: 
3
'Cited by' percentile rank: 
2
Assignee: 
US ARMY

Bipolar stacked transistor architecture

Patent image
AMRMC

An amplifier for an integrated circuit has a plurality of ratioed current mirrors connected to each other in a stacked configuration. Each ratio mirror has at least two resistors and at least two bipolar transistors connected to each other via said at least two resistors. Each amplifying transistor, contains a capacitor, and potentially and inductor, to internally match the transistors that make up the amplifying stack. DC, harmonic and s-parameter simulations are performed to provide an optimal impedance for each of the stacked transistors to maximize the RF power output of each stacked layer and the amplifier.

Inventors: 
Darwish, Ali; Farm, Thomas J.; Zaghloul, Mona
Patent Number: 
US8791759
Technical domain: 
Communications
FIle Date: 
2012-03-22
Grant Date: 
2014-07-29
Grant time: 
859 days
Grant time percentile rank: 
15
Claim count percentile rank: 
7
Citations percentile rank: 
1
'Cited by' percentile rank: 
1
Assignee: 
GEORGE WASHINGTON UNIV

Method and apparatus for macro photographic stereo imaging

Patent image
AMRMC

A macro photographic apparatus for creating focus stacked images of a specimen may include a rigid longitudinal member having a longitudinal axis and including a camera mount thereon. A translation device may be fixed to the member for translating the specimen along the member toward and away from the camera mount. A rotation device may be mounted on the translation device. The rotation device may support the specimen and enable rotation of the specimen around first and second axes that are perpendicular to the longitudinal axis of the member. At any single position of the translation device along the longitudinal axis of the member, as the specimen is rotated around the first and second axes, the spatial location of the specimen remains substantially the same.

Inventors: 
Gutierrez, Anthony
Patent Number: 
US9016960
Technical domain: 
Communications
FIle Date: 
2012-03-12
Grant Date: 
2015-04-28
Grant time: 
1,142 days
Grant time percentile rank: 
20
Claim count percentile rank: 
4
Citations percentile rank: 
1
'Cited by' percentile rank: 
1
Assignee: 
US ARMY

Modular gridded tapered slot antenna

Patent image
ARL

A planar antenna comprising: a substrate, a resonant element generating an electromagnetic wave, a plurality of parallel, spaced apart conductive strips on the substrate, wherein conductive strips form collinear rows of at least two strips that are physically separated by a slot to guide the electromagnetic wave in a specific direction.

Inventors: 
Coburn, William O.; Zaghloul, Amir I.
Patent Number: 
US9337542
Technical domain: 
Communications
FIle Date: 
2012-11-28
Grant Date: 
2016-05-10
Grant time: 
1,259 days
Grant time percentile rank: 
23
Claim count percentile rank: 
2
Citations percentile rank: 
1
'Cited by' percentile rank: 
1
Assignee: 
US ARMY

Nonvolatile corruption resistent magnetic memory and method thereof

Patent image
ARL

A method and system for storing information in a nonvolatile memory comprising: a substrate comprising magnetic material operatively associated therewith, the magnetic material having at least one first portion of low permeability and at least one second portion of high permeability; a reader comprising a sensor for reading information by measuring the magnetic permeability for the at least one first portion and the at least one second portion; whereby the at least one first and second portions are subjected to a magnetic probe field from one of an external source, the sensor, or a combination of an external source and the sensor.

Inventors: 
Edelstein, Alan S.; Petrie, Jonathan R.
Patent Number: 
US9047881
Technical domain: 
Communications
FIle Date: 
2012-12-21
Grant Date: 
2015-06-02
Grant time: 
893 days
Grant time percentile rank: 
16
Claim count percentile rank: 
6
Citations percentile rank: 
1
'Cited by' percentile rank: 
1
Assignee: 
US ARMY

Method and system for recovery of missing spectral information in wideband signal

Patent image
ARL

A system of recovering information wide band signal comprising a receiver(s) for receiving data signal responses from a target area; the received data signal responses having information missing at a plurality of frequencies; at least one processor for recovery of data from the data signal responses operatively connected to the receiver(s); a first memory comprising time-shifted responses based upon the wide band signal response, a second memory comprising a plurality of spectrally filtered time-shifted responses; whereby the first and second memories operate to provide data to the at least one processor compensate for the information missing at the plurality of frequencies. Also, a method of the recovery of missing frequency bands comprising receiving data signal responses from a target area using a first dictionary comprising time-shifted responses based upon spectra containing the at least one predetermined spectrum, and a second dictionary comprising a plurality of spectrally filtered time-shifted responses.

Inventors: 
Nguyen, Lam Huy; Do, Thong
Patent Number: 
US8824544
Technical domain: 
Communications
FIle Date: 
2012-05-22
Grant Date: 
2014-09-02
Grant time: 
833 days
Grant time percentile rank: 
15
Claim count percentile rank: 
6
Citations percentile rank: 
1
'Cited by' percentile rank: 
1
Assignee: 
US ARMY

Solid state circuit breaker

Patent image
ARL

A solid state circuit breaker includes a first terminal; a second terminal; a first wide-band gap field effect transistor coupled to the first terminal; a second wide-band gap field effect transistor coupled to the second terminal, wherein the first wide-band gap field effect transistor and the second wide-band gap field effect transistor are common-source connected to one another; and a bi-directional snubber device coupled to the first wide-band gap field effect transistor and the second wide-band gap field effect transistor. Such a solid state circuit breaker may also include a gate drive circuit coupled to the first wide-band gap field effect transistor and the second wide-band gap field effect transistor, where the gate drive circuit may comprise a voltage regulation stage and a drive stage.

Inventors: 
Urciuoli, Damian P.
Patent Number: 
US8742628
Technical domain: 
Communications
FIle Date: 
2010-04-28
Grant Date: 
2014-06-03
Grant time: 
1,497 days
Grant time percentile rank: 
27
Claim count percentile rank: 
6
Citations percentile rank: 
1
'Cited by' percentile rank: 
1
Assignee: 
US ARMY

Three dimensional piezoelectric MEMS

Patent image
ARL

Method and apparatus for a piezoelectric apparatus are provided. In some embodiments, a method for fabricating a piezoelectric device may include etching a series of vertical trenches in a top substrate portion, depositing a first continuous conductive layer over the trenches and substrate, depositing a continuous piezoelectric layer over the first continuous conductive layer such that the piezoelectric material has trenches and sidewalls, depositing a second continuous conductive layer over the continuous piezoelectric layer, etching through the vertical trenches of the first continuous conductive layer, continuous piezoelectric layer, second continuous conductive layer, and top substrate portion into a bottom substrate portion, etching a series of horizontal trenches in the bottom substrate portion such that the horizontal trenches and vertical trenches occupy a continuous free space and allow movement of a piezoelectric MEMS device created by the above method in three dimensions.

Inventors: 
Pulskamp, Jeffrey S.; Polcawich, Ronald G.
Patent Number: 
US8966993
Technical domain: 
Communications
FIle Date: 
2012-12-19
Grant Date: 
2015-03-03
Grant time: 
804 days
Grant time percentile rank: 
14
Claim count percentile rank: 
4
Citations percentile rank: 
1
'Cited by' percentile rank: 
1
Assignee: 
US ARMY

Voltage tunable oscillator using bilayer graphene and a lead zirconate titanate capacitor

Patent image
ARL

A voltage controlled oscillator comprising a substrate and a bilayer graphene transistor formed on the substrate. The transistor has two signal terminals and a gate terminal positioned in between the signal terminals. A voltage controlled PZT or MEMS capacitor is also formed on the substrate. The capacitor is electrically connected to the transistor gate terminal. At least one component is connected to the transistor and capacitor to form a resonant circuit.

Inventors: 
Nayfeh, Osama M.; Kilpatrick, Stephen James; Wilson, James; Dubey, Madam; Polcawich, Ronald G.
Patent Number: 
US9252704
Technical domain: 
Communications
FIle Date: 
2012-05-15
Grant Date: 
2016-02-02
Grant time: 
1,358 days
Grant time percentile rank: 
24
Claim count percentile rank: 
3
Citations percentile rank: 
1
'Cited by' percentile rank: 
1
Assignee: 
US ARMY

Method and apparatus for detecting radio-frequency signals using a dispersive fiber optical loop

Patent image
ARL

An apparatus comprising a dispersive fiber optical loop for delaying a first and second sideband, relative to each other, of a light modulated by a radio frequency signal to create a pair of pulses, a coupler for tapping a replica of the pair of pulses from the loop; and an auto-correlation module, coupled to the coupler, for correlating the replica of the pair of pulses with each other.

Inventors: 
Stead, Michael R.; Zhou, Weimin
Patent Number: 
US8532486
Technical domain: 
Communications
FIle Date: 
2012-02-13
Grant Date: 
2013-09-10
Grant time: 
575 days
Grant time percentile rank: 
10
Claim count percentile rank: 
5
Citations percentile rank: 
1
'Cited by' percentile rank: 
1
Assignee: 
US ARMY

System and processor implemented method for improved image quality and generating an image of a target illuminated by quantum particles

Patent image
ARL

According to some embodiments, system and methods for image improvement comprise: receiving a plurality of frames of a given region of interest, the frames comprised of a plurality of pixels; determining, based on a quantum property of the frames, a normalized pixel intensity value for each pixel of each of the plurality of frames; and generating an improved image of the given region of interest based on the plurality of frames and the corresponding normalized pixel intensity values for the frames, the order of the image being two. Also embodiments for generating an image of a target illuminated by quantum entangled particles, such as, photons, are disclosed.

Inventors: 
Meyers, Ronald E.; Deacon, Keith S.
Patent Number: 
US9131128
Technical domain: 
Communications
FIle Date: 
2014-06-12
Grant Date: 
2015-09-08
Grant time: 
453 days
Grant time percentile rank: 
8
Claim count percentile rank: 
6
Citations percentile rank: 
1
'Cited by' percentile rank: 
1
Assignee: 
US ARMY

Waveguide to co-planar-waveguide (CPW) transition

Patent image
ARL

Certain embodiments relate to a waveguide/coplanar waveguide (CPW) transition assembly adapted to transition RF signals from a waveguide to a coplanar waveguide (CPW), the waveguide/CPW transition assembly having at least some peripheral walls and including a central waveguide transition septum having the CPW disposed therein. The waveguide/coplanar waveguide (CPW) transition assembly includes an electronic component coupled to the CPW, and control circuitry operationally coupled with the electronic component. Portions of the control circuitry at least partially extend from outside of the at least some peripheral walls to within the at least some peripheral walls.

Inventors: 
Anthony, Theodore K.; Zaghloul, Amir I.
Patent Number: 
US9147924
Technical domain: 
Communications
FIle Date: 
2011-09-02
Grant Date: 
2015-09-29
Grant time: 
1,488 days
Grant time percentile rank: 
27
Claim count percentile rank: 
2
Citations percentile rank: 
1
'Cited by' percentile rank: 
1
Assignee: 
US ARMY

Power dividing and/or power-combining circuits with isolation

Patent image
ARL

Power-dividing and/or power-combining circuits have inputs, outputs, and at least three electrical pathways, with substantially equal input and output reflection coefficients. An electronic device may be provided in each of the pathways. Additionally, isolation circuits or devices can be inserted between signal lines to provide isolation between inputs, in the case of combining, or outputs, in the case of dividing. In one embodiment, multiple phase shift components are electrically connected to electronic devices in the electrical pathways. These phase shift components are selected so that a vector sum of the reflected signals from the inputs in combining and/or to the outputs in dividing is substantially minimized.

Inventors: 
Darwish, Ali M.; Hung, Hingloi Alfred
Patent Number: 
US9362602
Technical domain: 
Communications
FIle Date: 
2014-09-16
Grant Date: 
2016-06-07
Grant time: 
630 days
Grant time percentile rank: 
11
Claim count percentile rank: 
6
Citations percentile rank: 
1
'Cited by' percentile rank: 
1
Assignee: 
US ARMY

Method and system for estimation and extraction of interference noise from signals

Patent image
ARL

A system for reception of electromagnetic waves in spectrum in which interference occurs comprising at least one transmitter; at least one receiver configured to receive the received signal; a first memory portion configured to store data relating to a point target response; a spectrum estimator configured to estimate the frequencies at which interfering signals occur; at least one processor configured to generate an estimation of the interfering signals at the frequencies estimated by the spectrum estimator; a second memory portion operatively connected to the at least one processor configured to store the estimation of the components of the interfering signals; the at least one processor configured to substantially reduce or eliminate radio frequency interfering signals from the received signal utilizing the point target response and the estimation of the interfering signals; and a method to substantially reduce or eliminate radio frequency interfering signals from for image data.

Inventors: 
Nguyen, Lam H.; Tran, Trac D.
Patent Number: 
US9363024
Technical domain: 
Communications
FIle Date: 
2014-08-06
Grant Date: 
2016-06-07
Grant time: 
671 days
Grant time percentile rank: 
12
Claim count percentile rank: 
6
Citations percentile rank: 
1
'Cited by' percentile rank: 
1
Assignee: 
US ARMY

Ultra-wide-band (UWB) antenna assembly with at least one director and electromagnetic reflective subassembly and method

Patent image
ARL

An ultra-wideband antenna assembly comprising: an electromagnetic reflective structure for reflecting electromagnetic waves; the electromagnetic reflective structure operating to reflect electromagnetic waves in a first direction;an antenna operatively associated with the electromagnetic reflective structure such that electromagnetic waves emitted from the antenna towards the electromagnetic wave reflective structure are reflected back by the electromagnetic reflective structure in the first direction; the antenna being substantially planar and extending in a first plane; the first direction being substantially perpendicular to the first plane; andat least one director operatively associated with the antenna for focusing the electromagnetic waves transmitted by the antenna in the first direction; the at least one director being substantially planar and extending in a second plane wherein the second plane is substantially parallel to the first plane.

Inventors: 
Zaghloul, Amir Ibrahim; Lee, Youn Moo
Patent Number: 
US9444147
Technical domain: 
Communications
FIle Date: 
2013-09-05
Grant Date: 
2016-09-13
Grant time: 
1,104 days
Grant time percentile rank: 
20
Claim count percentile rank: 
3
Citations percentile rank: 
1
'Cited by' percentile rank: 
1
Assignee: 
US ARMY

High powered high speed switch

Patent image
ARL

An amplified signal switching system comprises a plurality of transducers, and a switch operable for diverting amplified transient signals to selected transducers and preventing the amplified transient signals from being sent to non-selected transducers, wherein the amplified transient signals are AC or acoustic signals, wherein the plurality of transducers comprise a plurality of speakers, and wherein the plurality of transducers are isolated from one another. The switching system further comprises an amplifier operable for sending the amplified transient signals to the switch. The switch selectively turns the amplified transient signals on and off to the selected transducers in order to prevent the non-selected transducers from receiving the amplified transient signals. Moreover, the switch minimizes signal distortion in the selected transducers, and alternatively, the switch eliminates signal output to the non-selected transducers.

Inventors: 
Mermagen, Timothy J.; Ferguson, Larry G.
Patent Number: 
US8532315
Technical domain: 
Communications
FIle Date: 
2009-04-02
Grant Date: 
2013-09-10
Grant time: 
1,622 days
Grant time percentile rank: 
29
Claim count percentile rank: 
1
Citations percentile rank: 
1
'Cited by' percentile rank: 
1
Assignee: 
US ARMY

Apparatus and method for spurious-free signal range measurement for RF circuitry

Patent image
ARL

The present invention is directed to an apparatus and methodology for performing spurious-free dynamic range (SFDR) measurements on an RF circuit, such as a mixer, using a single analog input port. The present invention is designed for use when access to the intermediate frequency (IF) port in a radio frequency (RF) front-end circuit is not available, when the traditional two-port method for making an SFDR measurement is inadequate. Passing the analog input through a directional coupler between the RF combiner and the mixer facilitates the performance of the traditional third order intermodulation (IMD) test. Key differences between the single-port and traditional two-port setups are considered and examined, and experimental data obtained using the single-port setup is compared to data obtained using the traditional two-port set-up for different mixer models. Comparison of similar results yields confirmation and a calibration to account for the additional losses introduced by the directional coupler.

Inventors: 
Mitchell, Gregory Allen; Fazi, Christian
Patent Number: 
US8314604
Technical domain: 
Communications
FIle Date: 
2009-07-23
Grant Date: 
2012-11-20
Grant time: 
1,216 days
Grant time percentile rank: 
22
Claim count percentile rank: 
6
Citations percentile rank: 
1
'Cited by' percentile rank: 
1
Assignee: 
US ARMY

RF MEMS series switch using piezoelectric actuation and method of fabrication

Patent image
ARL

A microelectromechanical system (MEMS) switch comprising a radio frequency (RF) transmission line; a structurally discontinuous RF conductor adjacent to the RF transmission line; a pair of cantilevered piezoelectric actuators flanking the RF conductor; a contact pad connected to the pair of cantilevered piezoelectric actuators; a pair of cantilevered structures connected to the RF conductor; a plurality of air bridges connected to the pair of cantilevered piezoelectric actuators; and a plurality of contact dimples on the contact pad. Preferably, the RF transmission line comprises a pair of co-planar waveguide ground planes flanking the RF conductor; and a plurality of ground straps connected to the pair of co-planar waveguide ground planes, wherein the RF transmission line is operable to provide a path along which RF signals propagate.

Inventors: 
Pulskamp, Jeffrey S.; Polcawich, Ronald G.; Judy, Daniel
Patent Number: 
US7532093
Technical domain: 
Communications
FIle Date: 
2006-09-07
Grant Date: 
2009-05-12
Grant time: 
978 days
Grant time percentile rank: 
17
Claim count percentile rank: 
7
Citations percentile rank: 
1
'Cited by' percentile rank: 
1
Assignee: 
US ARMY

Alternative design for quantum cryptographic entangling probe

Patent image
ARL

An alternative design is given for an optimized quantum cryptographic entangling probe for attacking the BB84 protocol of quantum key distribution. The initial state of the probe has a simpler analytical dependence on the set error rate to be induced by the probe than in the earlier design. The new device yields maximum information to the probe for a full range of induced error rates. As in the earlier design, the probe contains a single CNOT gate which produces the optimum entanglement between the BB84 signal states and the correlated probe states.

Inventors: 
Brandt, Howard E.
Patent Number: 
US7876901
Technical domain: 
Communications
FIle Date: 
2007-03-29
Grant Date: 
2011-01-25
Grant time: 
1,398 days
Grant time percentile rank: 
25
Claim count percentile rank: 
5
Citations percentile rank: 
2
'Cited by' percentile rank: 
1
Assignee: 
US ARMY

Radio frequency integrated circuit for enhanced transmit/receive performance in low power applications and method of making the same

Patent image
ARL

A radio frequency integrated circuit (and method of making) for enhancing wireless communication and/or sensing systems comprising a base comprising a gallium arsenide (GaAs) substrate; a binary phase shift keying modulator fabricated on the base; a power amplifier fabricated on the base and operatively associated with the binary phase shift keying modulator; the power amplifier having a first shunt operatively associated therewith; a transmit/receive switch fabricated on the base, the transmit/receive switch being operatively associated with the power amplifier and being alternately connectable to an antenna port adapted to be connected to an antenna; a low noise amplifier fabricated on the base; the low noise amplifier being alternately connectable to the antenna port, the low noise amplifier having a second shunt operatively associated therewith; the circuit operating in a transmit stage in which the power amplifier is connected to the antenna port and in a receive stage in which the low noise amplifier is connected to the antenna port; whereby in the receive stage the power amplifier is bypassed by the first shunt to reduce current consumption and substantially isolate the receive stage from the transmit stage; and in the transmit stage the low noise amplifier is bypassed by the second shunt to reduce current consumption and to substantially isolate the transmit stage from the receive stage.

Inventors: 
Penn, John Edward; Mitchell, Gregory Allen
Patent Number: 
US8472887
Technical domain: 
Communications
FIle Date: 
2010-09-09
Grant Date: 
2013-06-25
Grant time: 
1,020 days
Grant time percentile rank: 
18
Claim count percentile rank: 
5
Citations percentile rank: 
1
'Cited by' percentile rank: 
1
Assignee: 
US ARMY

System and method for visually creating, editing, manipulating, verifying, and/or animating desired topologies of a mobile ad hoc network and/or for generating mobility-pattern data

Patent image
ARL

A method and apparatus for creating virtual topologies for a mobile ad hoc network comprising generating at least two nodes representing transmitters and/or receivers in the network; each of said at least two nodes having parameters (which may be for example, location, direction, velocity, receiving/transmitting capability); generating a bidirectional or unidirectional link between two nodes when appropriate; storing the specifications of the topology of the network in memory; whereby the stored topologies are adapted to be inputted into a test-bed system capable of emulating a mobile ad-hoc network. Optionally, the images of the nodes and links are displayed on a display and/or may be stored on a programmable storage medium.

Inventors: 
Nguyen, Binh Quang
Patent Number: 
US8027273
Technical domain: 
Communications
FIle Date: 
2008-09-24
Grant Date: 
2011-09-27
Grant time: 
1,098 days
Grant time percentile rank: 
20
Claim count percentile rank: 
5
Citations percentile rank: 
2
'Cited by' percentile rank: 
2
Assignee: 
US ARMY

Free-space quantum communications process operative absent line-of-sight

Patent image
ARL

Photonic signals are tagged with a pre-selected modification, such as a polarization signature to carry data across an obstructed path between sender and receiver. Communication authentication through polarization variation allows for Yuen-Kumar or entangled photon quantum communication protocols to propagate through environmental scattering media such as air, smoke, fog, rain, and water. While ultraviolet light photons are well suited as a carrier for quantum communication signals scattered in air, it is appreciated that visible wavelengths have longer propagation paths in water to convey non-line-of-sight data. A secure signal is scattered by the media and simultaneously communicated to a single recipient or multiple recipients exposed to scattered signal portions. A process of solving the scattering processes through a random scattering media is provided to reconstruct a quantum keyed message at a receiver. The scattering of the signal is utilized herein to provide non-line-of-sight and intentional short-range communication.

Inventors: 
Meyers, Ronald E.; Deacon, Keith S.
Patent Number: 
US7805079
Technical domain: 
Communications
FIle Date: 
2006-03-20
Grant Date: 
2010-09-28
Grant time: 
1,653 days
Grant time percentile rank: 
30
Claim count percentile rank: 
4
Citations percentile rank: 
1
'Cited by' percentile rank: 
1
Assignee: 
US ARMY

Quantum Fourier transform based information transmission system and method

Patent image
ARL

A method of data compression and transmission include splitting a wave function representative of an input data set into an arbitrarily oriented elliptical polarization state and a comparator wave function state, the comparator wave function state being transmitted to a detector. A quantum Fourier transform is performed on the arbitrarily oriented elliptical polarization state to yield a quantum computational product. A quantum Hadamard transform is performed on the quantum computational product to yield one of two possible quantum particle outputs. The input data set is reconstructed based upon the coincident arrival of the comparator wave function state and one of the two quantum particle outputs. A method is performed on either a quantum computer or a digital computer. An optical bench with appropriate electronics is particularly well suited to function as a quantum computer for the compression and transmission of data corresponding to sound.

Inventors: 
Meyers, Ronald E.; Deacon, Keith S.
Patent Number: 
US7660533
Technical domain: 
Communications
FIle Date: 
2005-08-04
Grant Date: 
2010-02-09
Grant time: 
1,650 days
Grant time percentile rank: 
30
Claim count percentile rank: 
7
Citations percentile rank: 
1
'Cited by' percentile rank: 
2
Assignee: 
US ARMY

Free-space quantum communications system and process operative absent line-of-sight

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ARL

Photonic signals are tagged with a pre-selected modification, such as a polarization signature to carry data across an obstructed path between sender and receiver. Communication authentication through polarization variation allows for Yuen-Kumar or entangled photon quantum communication protocols to propagate through environmental scattering media such as air, smoke, fog, rain, and water. While ultraviolet light photons are well suited as a carrier for quantum communication signals scattered in air, it is appreciated that visible wavelengths have longer propagation paths in water to convey non-line-of-sight data. A secure signal is scattered by the media and simultaneously communicated to a single recipient or multiple recipients exposed to scattered signal portions. A process of solving the scattering processes through a random scattering media is provided to reconstruct a quantum keyed message at a receiver. The scattering of the signal is utilized herein to provide non-line-of-sight and intentional short-range communication.

Inventors: 
Meyers, Ronald Everett; Deacon, Keith Scott
Patent Number: 
US7945168
Technical domain: 
Communications
FIle Date: 
2010-08-20
Grant Date: 
2011-05-17
Grant time: 
270 days
Grant time percentile rank: 
4
Claim count percentile rank: 
5
Citations percentile rank: 
1
'Cited by' percentile rank: 
1
Assignee: 
US ARMY

Method of packet encryption that allows for pipelining

Patent image
NSA

A method of packet encryption and decryption that allows for pipelining. The first step is to identify the packets in a message to be encrypted. Then, a unique number is assigned to each packet. A value R is acquired. Then, a first register is initialized. An initialization vector IV is generated. Then, the first register is stepped a user-definable number of times. Then, a packet is selected. R and the unique number are combined. Then, a second register is initialized. A checksum is generated. Then, the packet is divided into blocks. A block is selected. Then, the checksum is combined with the block and designated the checksum. The block is encrypted. Then, the first and second registers are stepped. These steps are repeated for each block. Then, the checksum is encrypted. After the blocks are encrypted, the unique number, IV, the ciphertext of each block, and the encrypted checksum are transmitted. If there are any other packets to encrypt then the steps are repeated.

Inventors: 
Boyle Jr., Vincent Michael; Salter, Christopher Mark
Patent Number: 
US7406595
Technical domain: 
Communications
FIle Date: 
2004-05-05
Grant Date: 
2008-07-29
Grant time: 
1,546 days
Grant time percentile rank: 
28
Claim count percentile rank: 
8
Citations percentile rank: 
1
'Cited by' percentile rank: 
1
Assignee: 
NATIONAL SECURITY AGENCY

Method and system for observing a subject at a first location based upon quantum properties measured at a second location

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ARL

A preferred embodiment comprises a method and system for (a) detecting objects or targets which may or may not be nonreflective to electromagnetic radiation, and/or (b) generating an image of a subject or area, comprising generating an entangled photon pair beam; splitting the entangled photon pair beam into first and second parts; the first parts being directed in a first direction towards a first location, and the second parts being received into a measuring device; measuring the physical characteristics of the conjugate second parts to determine whether or not the first parts have encountered the presence or absence of an object at the first location in combination with the time that the first part takes to enter the first location. The method and system incorporate a photon beam in a reference path that never directly interacts with the object yet is determinative of presence or absence of an object at the first location. The splitting of the entangled photon pair beam occurs prior to the first parts being absorbed by said object, and the measuring of the characteristics of the conjugates occurs subsequent to the splitting of the entangled photon beam.

Inventors: 
Meyers, Ronald Everett; Deacon, Keith Scott
Patent Number: 
US7847234
Technical domain: 
Communications
FIle Date: 
2008-12-23
Grant Date: 
2010-12-07
Grant time: 
714 days
Grant time percentile rank: 
13
Claim count percentile rank: 
3
Citations percentile rank: 
1
'Cited by' percentile rank: 
2
Assignee: 
US ARMY

Systems and methods for obtaining information on a key in BB84 protocol of quantum key distribution

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ARL

Systems and methods for obtaining information on a key in the BB84 (Bennett-Brassard 1984) protocol of quantum key distribution are provided. A representative system comprises a quantum cryptographic entangling probe, comprising a single-photon source configured to produce a probe photon, a polarization filter configured to determine an initial probe photon polarization state for a set error rate induced by the quantum cryptographic entangling probe, a quantum controlled-NOT (CNOT) gate configured to provide entanglement of a signal with the probe photon polarization state and produce a gated probe photon so as to obtain information on a key, a Wollaston prism configured to separate the gated probe photon with polarization correlated to a signal measured by a receiver, and two single-photon photodetectors configured to measure the polarization state of the gated probe photon.

Inventors: 
Brandt, Howard E.
Patent Number: 
US7920704
Technical domain: 
Communications
FIle Date: 
2005-09-26
Grant Date: 
2011-04-05
Grant time: 
2,017 days
Grant time percentile rank: 
37
Claim count percentile rank: 
6
Citations percentile rank: 
2
'Cited by' percentile rank: 
1
Assignee: 
US ARMY

High efficiency and high power patch antenna and method of using

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ARL

A patch antenna system and method comprising a base extending in a first plane; at least one patch mounted in a plane substantially parallel to the first plane; spaced from the base by at least one metallic post such that between the base and patch is substantially only gaseous fluid (which may be air). At least one power source may be operatively connected to the at least one patch for generation of electromagnetic waves at a center frequency of approximately 5.8 Gigahertz. The method of neutralizing unattended microwave devices comprises connecting a power source to a patch antenna and operating the patch antenna at a frequency in the range of approximately 3.89 to of 5.85 Gigahertz in the vicinity of a suspected unattended microwave device used to activate an explosive device to thereby jam any communication signal to the unattended microwave device and prevent the activation.

Inventors: 
Ly, Canh; Harrison, Arthur C.
Patent Number: 
US8059034
Technical domain: 
Communications
FIle Date: 
2009-03-03
Grant Date: 
2011-11-15
Grant time: 
987 days
Grant time percentile rank: 
18
Claim count percentile rank: 
6
Citations percentile rank: 
2
'Cited by' percentile rank: 
1
Assignee: 
US ARMY

System and method for determining three-dimensional information from two-dimensional images

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ARL

A system and method of determining three-dimensional data for an object by performing optical flow analysis to calculate surface profile analysis for a group of monocular component images that vary wavelength distribution, and determining three-dimensional data relating to the object from the component images and the surface profile analysis. Stereo image features are obtained from a single monocular polychromatic raw image or multiple monocular grayscale images having known spectral imaging collection data. Apparatus are described which allow three-dimensional data for an object to be determined from one or more two-dimensional images of the object.

Inventors: 
Meyers, Ronald Everett; Rosen, David Lawrence; Deacon, Keith Scott
Patent Number: 
US8149268
Technical domain: 
Communications
FIle Date: 
2010-11-05
Grant Date: 
2012-04-03
Grant time: 
515 days
Grant time percentile rank: 
9
Claim count percentile rank: 
6
Citations percentile rank: 
1
'Cited by' percentile rank: 
2
Assignee: 
US ARMY

Apparatus and method for forming electronic devices

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ARL

A method of forming at least one electronic device on a substrate comprising creating a depository and an attached capillary; providing a liquid containing particles in the range 1 nanometer to 1 millimeter for deposit into the depository; the liquid flowing into the at least one capillary by capillary action; evaporating the liquid such that the particles form an agglomerate beginning at the end of the at least one capillary with a substantially uniform distribution of the particles within the agglomerate; whereby the agglomerate is used to form a part of the at least one electronic device. An microelectronic integrated circuit device comprising a substrate; a depository coupled to said substrate formed by at least one wall, a capillary channel coupled to said depository adapted to be filled with liquid comprising nanoparticles by capillary action, whereby as the liquid evaporates, an agglomerate forms in the capillary channel having a substantially uniform distribution of the particles.

Inventors: 
Bedair, Sarah S.; Morgan, Brian; Meyer, Christopher D.
Patent Number: 
US8234773
Technical domain: 
Communications
FIle Date: 
2010-03-31
Grant Date: 
2012-08-07
Grant time: 
860 days
Grant time percentile rank: 
15
Claim count percentile rank: 
5
Citations percentile rank: 
1
'Cited by' percentile rank: 
1
Assignee: 
US ARMY

Microscale implementation of a bio-inspired acoustic localization device

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ARL

An apparatus and method for creating a MEMS directional sensor system capable of determining direction from at least two microphones to a sound source over a wide range of frequencies is disclosed. By utilizing a stiff beam stand-off architecture that relies on a unique manufacturing technique in a MEMS device, such as described herein, a very small set of microphones, on the order of a few micrometers, can be designed with unsurpassed ability to detect a sound source location.

Inventors: 
Currano, Luke J.; Gee, Danny
Patent Number: 
US8611565
Technical domain: 
Communications
FIle Date: 
2011-04-14
Grant Date: 
2013-12-17
Grant time: 
978 days
Grant time percentile rank: 
17
Claim count percentile rank: 
2
Citations percentile rank: 
1
'Cited by' percentile rank: 
1
Assignee: 
US ARMY

Automated video data fusion method

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ARL

A method for mitigating image distortions induced by optical wave propagation through a random media (e.g., atmospheric turbulence or volume of water) from a stream of video data provided by a single shortexposure image sensor is described. The method is based on the two following sequential steps: (1) enhancement of the raw video stream and (2) fusion of the enhanced stream using the lucky region fusion (LRF) technique. The first step enhances features of the raw image stream the LRF method success is based on and especially mitigates the effect of low light level, aerosol pollution, dust, haze, and other deteriorating factors. The second step, fusion of the enhanced stream, is realized by sequentially merging image regions with highest quality within a temporal buffer into a single image before sliding the temporal window forward. The process is continuously repeated in order to generate a stream of fused images. The resulting fused stream hence has an image quality superior to that of any image within the buffer and demonstrates improved contrast as well as increased detail visualization. In addition, the disclosed invention offers a method for automated extraction of random media (atmospheric turbulence for example) characteristics needed for optimizing the LRF method performance. Based solely on analysis of the enhanced video stream, this has the advantage to eliminate the need for turbulence strength characterization devices (e.g., scintillometer) and it allows the invention to provide an optimal fused stream even when operating within an evolving environment.

Inventors: 
Vorontsov, Mikhail A.; Carhart, Gary W.; Aubailly, Mathieu
Patent Number: 
US8611691
Technical domain: 
Communications
FIle Date: 
2010-07-15
Grant Date: 
2013-12-17
Grant time: 
1,251 days
Grant time percentile rank: 
23
Claim count percentile rank: 
2
Citations percentile rank: 
1
'Cited by' percentile rank: 
1
Assignee: 
US ARMY

Quantum based information transfer system and method

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ARL

A method and system for transferring data comprising: an entangled photon source for producing first and second entangled photons associated with a receiver and a sender, respectively;a Bell state measurement device for performing a joint Bell state measurement on the second entangled photon and the at least one qubit; the Bell state measurement device outputting two bits of data to be used at the receiver;a transmission channel for transmitting two bits from the outcome of the Bell state measurement device to the receiver;a unitary transformation device for performing a unitary transformation operation on the first entangled photon based upon the value of the two bits of data;at least one detector for detecting encoded information from the first entangled photon; at least one processor operating to determine whether or not to transmit portions of data from a sequential successive qubit based upon the preceding qubit.

Inventors: 
Meyers, Ronald E.; Deacon, Keith S.
Patent Number: 
US8983303
Technical domain: 
Communications
FIle Date: 
2013-07-23
Grant Date: 
2015-03-17
Grant time: 
602 days
Grant time percentile rank: 
10
Claim count percentile rank: 
6
Citations percentile rank: 
1
'Cited by' percentile rank: 
1
Assignee: 
US ARMY

Apparatus and method for suspension wicking of nanoparticles into microchannels

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ARL

A method of forming a device on a substrate comprising creating a depository and at least one attached capillary; the depository being of millimeter scale; providing a liquid containing particles in the range 1 nanometer to 1 millimeter; depositing into the depository the liquid containing particles which flows into at least one capillary by capillary action; evaporating the liquid such that the particles form an agglomerate beginning at the end of the at least one capillary with a substantially uniform distribution of the particles within the agglomerate; which is used to form a device. A microelectronic integrated circuit device comprising a substrate; a depository coupled to said substrate, the depository being formed by at least one wall adjacent to the substrate; at least one capillary channel coupled to at least one depository that is formed by walls adapted to be filled with a liquid (by capillary action) comprising nanoparticles.

Inventors: 
Smith, Gabriel L.; Bedair, Sarah Salah
Patent Number: 
US8728409
Technical domain: 
Communications
FIle Date: 
2012-05-18
Grant Date: 
2014-05-20
Grant time: 
732 days
Grant time percentile rank: 
13
Claim count percentile rank: 
5
Citations percentile rank: 
1
'Cited by' percentile rank: 
1
Assignee: 
US ARMY

Crew shared video display system and method

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ARL

A dual-image display for at least two crewmembers who may interact independently with the display using touch screen buttons, switches, or hand controllers. The display enables the simultaneous display of different information and visual content depending on the viewing angle or direction. In one embodiment, a video display system for use by crewmembers in vehicles may include: a computer processor; a display monitor comprising a common display driver configured to provide separate virtual displays to at least two crewmember users, the virtual displays being visible to a respective user based on the an angle of view of the respective user; and one or more activators operatively associated with the users, wherein said display monitor is configured to be activated by said one or more activators of said users according to a user priority determination algorithm executed by said computer processor.

Inventors: 
Smyth, Christopher C.
Patent Number: 
US8922587
Technical domain: 
Communications
FIle Date: 
2013-03-14
Grant Date: 
2014-12-30
Grant time: 
656 days
Grant time percentile rank: 
11
Claim count percentile rank: 
6
Citations percentile rank: 
1
'Cited by' percentile rank: 
1
Assignee: 
US ARMY

Wireless communication method and system for transmission authentication at the physical layer

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ARL

The subject authentication scheme encompasses a large family of authentication systems which may be built over existing transmission systems. By superimposing a carefully designed secret modulation on the waveforms, authentication is added to the signal without requiring additional bandwidth. The authentication information (tag signal) is sent concurrently with data (message signal). The authentication is designed to be stealthy to the uninformed user, robust to interference, and secure for identity verification. The tradeoffs between these three goals are identified and analyzed. The use of the authentication for channel estimation is also considered, and improved bit errors are demonstrated for time-varying channels. With a long enough authentication code word an authentication system is achieved with very slight data degradation. Additionally, by treating the authentication tag as a sequence of pilot symbols, the data recovery may be improved by the aware receiver.

Inventors: 
Baras, John S.; Yu, Paul L.; Sadler, Brian M.
Patent Number: 
US9161214
Technical domain: 
Communications
FIle Date: 
2013-02-19
Grant Date: 
2015-10-13
Grant time: 
966 days
Grant time percentile rank: 
17
Claim count percentile rank: 
6
Citations percentile rank: 
1
'Cited by' percentile rank: 
1
Assignee: 
US ARMY

Compact Rotman lens using metamaterials

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ARL

Apparatus for receiving and transmitting electromagnetic signals are disclosed herein. In some embodiments, an apparatus includes a positive refractive index (PRI) medium; a negative refractive index (NRI) medium having a first side and a second side disposed in the PRI medium; a plurality of first transmission lines, each first transmission line having a first end extending toward the first side of the NRI medium; and a plurality of second transmission lines, each second transmission line having a second end extending toward the second side of the NRI medium, wherein a plurality of electromagnetic signals travelling in a first direction, enters the PRI medium and travels along the plurality of first transmissions lines and exits into first side of the NRI medium, passes through the NRI medium and exits through the second side of the NRI medium into the PRI medium along a first one of the second transmission lines.

Inventors: 
Zaghloul, Amir I.; Adler, Eric D.
Patent Number: 
US8736503
Technical domain: 
Communications
FIle Date: 
2012-01-30
Grant Date: 
2014-05-27
Grant time: 
848 days
Grant time percentile rank: 
15
Claim count percentile rank: 
6
Citations percentile rank: 
1
'Cited by' percentile rank: 
1
Assignee: 
US ARMY

Electro optical scanning phased array antenna for pulsed operation

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ARL

An electro optical scanning phased array antenna having a laser which generates a pulsed output. A microwave source has an output which amplitude modulates the optical output from the laser through an optical modulator. An optical loop circuit has an input connected to an output from the optical modulator and a variable time delay element. The optical loop circuit generates a plurality of modulated optical pulses at equidistantly spaced time intervals from each other at an output from the loop circuit. These time intervals vary as a function of the variable time delay element and a control circuit controls the time delay attributable to the variable time delay element. An antenna array includes end elements while a circuit converts the optical output pulses from the optical loop circuit to radio frequency signals electrically connected to the elements of the antenna array.

Inventors: 
Zhou, Weimin
Patent Number: 
US8779977
Technical domain: 
Communications
FIle Date: 
2007-06-26
Grant Date: 
2014-07-15
Grant time: 
2,576 days
Grant time percentile rank: 
47
Claim count percentile rank: 
2
Citations percentile rank: 
1
'Cited by' percentile rank: 
1
Assignee: 
US ARMY

System and method for quantum based information transfer

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ARL

A system for communicating data comprising sender and receiver subsystems; at least one data input; at least one entangled photon source; first photons of the pairs of entangled photons outputted by the at least one photon source being processed by one of the sender or receiver subsystem; second photons of the pairs of entangled photons being processed by the other of the sender or receiver subsystem; a photonic element configured to receive the first photons of the pairs of entangled photons and enable interference therebetween; at least one absorber configured to absorb the first photons after passage through the beam splitter, the absorbance of the first photons operating to transfer the properties of the entanglement to the second photons of the pairs of entangled photons; and a Bell state measurement element operatively associated with the receiver subsystem configured to measure the second photons of the pairs of entangled photons.

Inventors: 
Meyers, Ronald E.; Deacon, Keith S.
Patent Number: 
US9270385
Technical domain: 
Communications
FIle Date: 
2014-10-09
Grant Date: 
2016-02-23
Grant time: 
502 days
Grant time percentile rank: 
9
Claim count percentile rank: 
6
Citations percentile rank: 
1
'Cited by' percentile rank: 
1
Assignee: 
US ARMY

Image enhancement system and method

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ARL

A method and system for imaging information comprising at least one processor for processing information; a light source for illuminating first and second locations; a spatial receiver located at the second location for receiving the illuminating light comprising an array of pixel locations for detecting high resolution spatial information concerning the illuminating light; the spatial receiver being operatively connected, to the at least one processor and operating to transmit high resolution spatial information correlated to specific intervals of time to the processor; the at least one receiver operatively connected to the processor(s) and operative to receive light reflected from a subject and operating to transmit low resolution spatial information to the processor correlated to specific intervals of time; the processor operating to correlate a response by the at least one receiver with spatial information derived from the spatial receiver at correlating time intervals to create a high resolution image.

Inventors: 
Meyers, Ronald Everett; Deacon, Keith Scott
Patent Number: 
US8811768
Technical domain: 
Communications
FIle Date: 
2012-05-22
Grant Date: 
2014-08-19
Grant time: 
819 days
Grant time percentile rank: 
15
Claim count percentile rank: 
6
Citations percentile rank: 
1
'Cited by' percentile rank: 
1
Assignee: 
US ARMY

Method and implementation for information exchange using Markov models

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ARL

The replacement of secret keys is a central problem in key management. Typical solutions exchange handshaking messages, involve complex computations, or require the cooperation of trusted third parties. Disclosed herein is a key replacement method that exploits the randomness of Markov models to efficiently provide fresh keys to users. Unlike other methods, the proposed method removes the need for extra communications, intensive computation, or third parties. It is demonstrated that the proposed method has perfect forward secrecy as well as resistance to known-key attacks.

Inventors: 
Baras, John S.; Yu, Paul L.; Sadler, Brian M.
Patent Number: 
US8848904
Technical domain: 
Communications
FIle Date: 
2009-10-23
Grant Date: 
2014-09-30
Grant time: 
1,803 days
Grant time percentile rank: 
33
Claim count percentile rank: 
6
Citations percentile rank: 
1
'Cited by' percentile rank: 
1
Assignee: 
UNIV MARYLAND

Binary bi-phase shift modulator

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ARL

A binary bi-phase shift modulator having an input piezoelectric transducer and an output piezoelectric transducer connected in series between a radio frequency input and a radio frequency output. A fixed DC pole voltage having a first polarity is connected to one of the transducers. A DC switched pole voltage is connected to the other transducer which switches between the pole voltage of the first polarity and a pole voltage of the opposite polarity in accordance with a binary data signal. The polarity of the radio frequency input relative to the radio frequency output varies as a function of the polarity of the DC switched pole voltage.

Inventors: 
Kaul, Roger D.; Pulskamp, Jeffrey S.; Polcawich, Ronald G.; Bedair, Sarah
Patent Number: 
US8872595
Technical domain: 
Communications
FIle Date: 
2012-09-11
Grant Date: 
2014-10-28
Grant time: 
777 days
Grant time percentile rank: 
14
Claim count percentile rank: 
6
Citations percentile rank: 
1
'Cited by' percentile rank: 
1
Assignee: 
US ARMY

Power dividing and power combining circuits

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ARL

Power-dividing and/or power-combining circuits have inputs, outputs, at least three electrical pathways, and at least three electronic devices, such as amplifiers, with substantially equal input and output reflection At least one of the electronic devices is in each of the electrical pathways. In one embodiment, multiple phase shift components, such as delay lines, are electrically connected to the electronic devices in each of the electrical pathways. These phase shift components are selected so that a vector sum of the reflected signals from the electronic devices to the inputs and/or the outputs is substantially minimized. In another embodiment, a serial bus extends from the inputs/outputs and at least three pathways in the circuit. The serial bus includes serially-connected impedance-providing components positioned among at least three pathways with the impedance-providing components increasing in impedance from one end to the other end of the serial bus in an amount sufficient to produce a substantially equal amount of power to each of the electronic devices and to substantially minimize input and output reflections.

Inventors: 
Darwish, Ali M.; Hung, Hingloi Alfred
Patent Number: 
US9000865
Technical domain: 
Communications
FIle Date: 
2013-06-20
Grant Date: 
2015-04-07
Grant time: 
656 days
Grant time percentile rank: 
11
Claim count percentile rank: 
5
Citations percentile rank: 
1
'Cited by' percentile rank: 
1
Assignee: 
US ARMY

Passive imaging correction system using feedback including a variable aperture with plural settings and method thereof

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ARL

A method and system for image processing comprising an opening for entrance of light for forming an image by the system; at least one optical element through which the light passes; a variable aperture operatively associated with the at least one optical element placed in the optical train at an image plane and comprising a plurality of settings comprising first mask settings for shielding portions of the light and second mask settings for selectively masking portions of the light that pass through the first mask settings; an imager, the at least one processor being operatively connected to the variable aperture and imager for controlling the passage of the light through the variable aperture by selecting one of plurality of first mask settings and associated second mask settings, obtaining image results using the settings, comparing image results obtained by the respective mask settings, and determining the optimal first mask setting.

Inventors: 
Tofsted, David H.; O'brien, Sean Gerard
Patent Number: 
US9006633
Technical domain: 
Communications
FIle Date: 
2012-11-02
Grant Date: 
2015-04-14
Grant time: 
893 days
Grant time percentile rank: 
16
Claim count percentile rank: 
5
Citations percentile rank: 
1
'Cited by' percentile rank: 
1
Assignee: 
US ARMY

Method and apparatus for reading a non-volatile memory using a spin torque oscillator

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ARL

A method and apparatus for reading electronic memory comprising a current source, a spin transfer oscillator, an external field source, coupled to the current source, for generating an RF signal, the spin torque oscillator positioned proximate a magnetic media comprising a plurality of bit regions of varying magnetic permeability, wherein a frequency of the RF signal varies in response to the permeability of a bit region in the plurality of bit regions being proximate the spin torque oscillator.

Inventors: 
Edelstein, Alan S.
Patent Number: 
US9030780
Technical domain: 
Communications
FIle Date: 
2012-12-18
Grant Date: 
2015-05-12
Grant time: 
875 days
Grant time percentile rank: 
16
Claim count percentile rank: 
2
Citations percentile rank: 
1
'Cited by' percentile rank: 
1
Assignee: 
US ARMY

Method and system for optimizing signal recognition in a multiwavelength optical communication system

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ARL

A system and method for optimizing signal recognition in a light communication system by approximately maximizing the minimum distance between received constellation points; the method comprising identifying the constellation region containing points for transmitting symbols, identifying channel impairments, transforming the constellation region according to the channel impairments into a constellation region of potential received symbols, using signal processing circuitry to apply an algorithm that operates to maximize the minimum distance between constellation points to obtain a symbol constellation in the receiver constellation region, and inverting the transformation to obtain the designed transmitted-symbol constellation. The system comprises signal processing circuitry for performing a preferred methodology.

Inventors: 
Drost, Robert James; Sadler, Brian M.
Patent Number: 
US9083449
Technical domain: 
Communications
FIle Date: 
2012-11-14
Grant Date: 
2015-07-14
Grant time: 
972 days
Grant time percentile rank: 
17
Claim count percentile rank: 
6
Citations percentile rank: 
1
'Cited by' percentile rank: 
1
Assignee: 
US ARMY

Electromagnetic field assisted self-assembly with formation of electrical contacts

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ARL

A method and apparatus for self-assembling a part on a substrate are disclosed herein. In some embodiments, a method includes placing a substrate having a first binding site capable of generating a first magnetic field and having a first shaped surface with a first droplet conformably disposed thereon into a first fluid; placing a part having a second binding site capable of generating a second magnetic field and having a second shaped surface with a second droplet conformably disposed on the second shaped surface into the first fluid; and attracting the part towards the first binding site such that an equilibrium is formed between an attractive force and a repulsive force such that the part is free to rotate about the first binding site to minimize the repulsive force when the first and second shaped surfaces rotate into an alignment causing the part to aligned with the first binding site.

Inventors: 
Morris, Christopher James
Patent Number: 
US9137935
Technical domain: 
Communications
FIle Date: 
2014-09-26
Grant Date: 
2015-09-15
Grant time: 
354 days
Grant time percentile rank: 
6
Claim count percentile rank: 
5
Citations percentile rank: 
1
'Cited by' percentile rank: 
1
Assignee: 
US ARMY

Method and system for removal of noise in signal

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ARL

A method and system for reception of electromagnetic waves in which interference with radio frequencies of other electronics devices occurs comprising; at least one transmitter for transmitting electromagnetic radiation at a wide range of frequencies;at least one receiver fix receiving the received signal comprising the first electromagnetic radiation and RF interfering signal data;a first memory portion for storing transmitted signal waveforms;a second memory portion for storing RF interfering signal data;a switch for periodically allowing the RF interfering signal data to enter the second memory portion from the receiver;the at least one processor operating to process and compare the received signal containing RE signal data and first electromagnetic radiation by matching the received signal against data relating to the transmitted signal waveforms from the first memory portion and RF interfering signal data from the second memory portion, and extract the RF interfering signal data.

Inventors: 
Nguyen, Lam Huy; Tran, Trac D.
Patent Number: 
US9172476
Technical domain: 
Communications
FIle Date: 
2013-05-09
Grant Date: 
2015-10-27
Grant time: 
901 days
Grant time percentile rank: 
16
Claim count percentile rank: 
5
Citations percentile rank: 
1
'Cited by' percentile rank: 
1
Assignee: 
US ARMY

Method and apparatus for providing a multifunction sensor using mesh nanotube material

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ARL

A method and apparatus for providing multiple functions using nanotube threads comprising: a first nanotube thread and a second nanotube thread, the first nanotube thread and the second nanotube thread arranged to form a mesh, wherein the first nanotube thread further comprises a measurable invariant property and the second nanotube thread comprises a measurable variant property.

Inventors: 
Keller, Steven D.; Zaghloul, Amir I.
Patent Number: 
US9276305
Technical domain: 
Communications
FIle Date: 
2012-11-28
Grant Date: 
2016-03-01
Grant time: 
1,189 days
Grant time percentile rank: 
21
Claim count percentile rank: 
2
Citations percentile rank: 
1
'Cited by' percentile rank: 
1
Assignee: 
US ARMY

RF system with integrated phase shifters using dual multi-phase phase-locked loops

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ARL

An RF system comprising of outputs to an electronically scanning antenna for radiating electromagnetic energy; at least one waveform generator; two multiphase phase-locked loops integrated with the waveform generator, the phase locked loops operating to provide multiple shifted phases to a waveform. Optionally, the two multiphase phase-locked loops may each be divided down by a bank of frequency dividers to further increase the number of phase shifts. The phases generated from each multiphase phase-locked loops are selected with multiplexers then mixed together. These upper or lower sidebands are then mixed with the up converted waveform which results in a phase shift for the waveform associated with each antenna element.

Inventors: 
Dai, Fa Foster; Goldman, Geoffrey
Patent Number: 
US9343809
Technical domain: 
Communications
FIle Date: 
2013-02-15
Grant Date: 
2016-05-17
Grant time: 
1,187 days
Grant time percentile rank: 
21
Claim count percentile rank: 
6
Citations percentile rank: 
1
'Cited by' percentile rank: 
1
Assignee: 
US ARMY

Broadband electromagnetic band-gap (EBG) structure

Patent image
ARL

An electromagnetic bandgap structure comprising a progressive cascade of a plurality of patterns of cells. The cells of each pattern are dimensioned so that each pattern has a reflection phase response centered at a different, but closely-spaced, frequency compared with the reflection phase response of an adjacently positioned pattern, so that the combined reflection phase response of the plurality of patterns provides a continuous wideband operational range.

Inventors: 
Zaghloul, Amir I.; Weiss, Steven J.
Patent Number: 
US9407011
Technical domain: 
Communications
FIle Date: 
2012-12-13
Grant Date: 
2016-08-02
Grant time: 
1,328 days
Grant time percentile rank: 
24
Claim count percentile rank: 
3
Citations percentile rank: 
1
'Cited by' percentile rank: 
1
Assignee: 
US ARMY

Electrically insulating elements and electrically conductive elements formed from elements having different oxidation behaviors

Patent image
ARL

Embodiments of the present invention are directed to electrical devices and methods for fabricating electrical devices using an oxidation process. According to one embodiment, a method of forming an electrical device using an oxidation process includes forming a metallic element which is to become an electrically insulating or resistive element in an electrical device; forming an electrically conductive element connected to the metallic element, wherein the metallic element and the electrically conductive element have different oxidation behavior when subjected to the oxidation process; and subjecting the elements forming the electrically insulating or resistive element and the electrically conductive element to the oxidation process.

Inventors: 
Lazarus, Nathan S.; Meyer, Christopher D.; Bedair, Sarah S.
Patent Number: 
US9439295
Technical domain: 
Communications
FIle Date: 
2013-04-25
Grant Date: 
2016-09-06
Grant time: 
1,230 days
Grant time percentile rank: 
22
Claim count percentile rank: 
7
Citations percentile rank: 
1
'Cited by' percentile rank: 
1
Assignee: 
US ARMY

System for transferring electrical energy

Patent image
ARL

A system for transferring electrical power, data or both, by way of magnetic induction between a first article and a second article. A first electrically conductive coil is integrated in the first article and a second electrically conductive coil is integrated to a second article. A fastener comprising ferromagnetic or ferrimagnetic material is configured to be positioned through the first coil and the second coil to provide an efficient magnetic conductance path between the first coil and the second coil and to removably secure the first article and the second article together. A control circuit selectively energizes the first coil or second coil with alternating current to transfer electrical energy to the other of said first and second coil.

Inventors: 
Meyer, Christopher D.; Morgan, Brian C.
Patent Number: 
US9467207
Technical domain: 
Communications
FIle Date: 
2013-09-12
Grant Date: 
2016-10-11
Grant time: 
1,125 days
Grant time percentile rank: 
20
Claim count percentile rank: 
6
Citations percentile rank: 
1
'Cited by' percentile rank: 
1
Assignee: 
US ARMY

High power two-patch array antenna system

Patent image
ARL

A patch array antenna is disclosed. The patch array antenna includes a ground plane with two patches. Each patch is supported from the ground plane only by metal posts. The patch array antenna further includes two-pin-feed probes, each pin-feed probe coupled to one patch, and a two-way high power divider attached to both pin-feed probes.

Inventors: 
Ly, Canh; Weiss, Steven J.; Harrison, Arthur C.
Patent Number: 
US7692592
Technical domain: 
Communications
FIle Date: 
2008-07-24
Grant Date: 
2010-04-06
Grant time: 
621 days
Grant time percentile rank: 
11
Claim count percentile rank: 
5
Citations percentile rank: 
1
'Cited by' percentile rank: 
1
Assignee: 
US ARMY

Laser-based technique for the transfer and embedding of electronic components and devices

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NRL

A laser direct write method used to transfer entire single components such as semiconductor bare dies or surface mount passive and active components on a substrate or inside recess in a substrate for making embedded microelectronics is disclosed. This method laser-machine the pockets, laser-transfer the individual components inside those pockets, and then laser-print the interconnects required to “wire” the components, thus resulting in a fully assembled embedded circuit required to make a fully functional microelectronic system.

Inventors: 
Pique, Alberto; Mathews, Scott A.; Auyeung, Raymond C. Y.; Sood, Bhanu Pratrap
Patent Number: 
US8056222
Technical domain: 
Communications
FIle Date: 
2009-02-20
Grant Date: 
2011-11-15
Grant time: 
998 days
Grant time percentile rank: 
18
Claim count percentile rank: 
5
Citations percentile rank: 
1
'Cited by' percentile rank: 
1
Assignee: 
US NAVY

Double balun dipole

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NRL

A double balun dipole antenna element includes a dielectric substrate having a first surface and an opposing second surface, a pair of coplanar Marchand baluns positioned in a mutually antiphase configuration on the first and second surfaces, and at least one feed line connected to the pair of Marchand baluns. A doubly polarized antenna element includes a pair of orthogonally interleaved double balun dipole antenna elements, which can be further configured into an array of such antenna elements.

Inventors: 
Pickles, William R.
Patent Number: 
US8350774
Technical domain: 
Communications
FIle Date: 
2008-09-12
Grant Date: 
2013-01-08
Grant time: 
1,579 days
Grant time percentile rank: 
29
Claim count percentile rank: 
5
Citations percentile rank: 
1
'Cited by' percentile rank: 
1
Assignee: 
US NAVY

Artificial dielectric composites by a direct-write method

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NRL

The present invention is generally directed to an artificial dielectric composite having an electrically non-conducting substrate, an electrically non-conducting pattern on the substrate, and an electrically conducting coating on the pattern. The substrate may be a textile such as paper. The electrically non-conducting pattern may comprise palladium. A direct-write device, such as an inkjet printer, may be used to print the pattern onto the substrate. The electrically conducing coating may comprise nickel, gold, palladium, cobalt, iron, copper, or any combination thereof. Also disclosed is the related method of making the artificial dielectric composite.

Inventors: 
Zabetakis, Daniel
Patent Number: 
US8199044
Technical domain: 
Communications
FIle Date: 
2009-03-31
Grant Date: 
2012-06-12
Grant time: 
1,169 days
Grant time percentile rank: 
21
Claim count percentile rank: 
3
Citations percentile rank: 
1
'Cited by' percentile rank: 
1
Assignee: 
US NAVY

Method and apparatus for motion-compensated interpolation (MCI) with conservative motion model

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NRL

Motion compensated interpolation (MCI) methods and apparatus are presented for constructing interpolation image frames by computing at least one interpolated motion field at a temporal interpolation time using a conservative motion equation system, and computing at least one interpolation image frame based on the computed interpolated motion field using an MCI equation system.

Inventors: 
Chen, Wei
Patent Number: 
US8559763
Technical domain: 
Communications
FIle Date: 
2011-12-13
Grant Date: 
2013-10-15
Grant time: 
672 days
Grant time percentile rank: 
12
Claim count percentile rank: 
6
Citations percentile rank: 
2
'Cited by' percentile rank: 
1
Assignee: 
US NAVY

Systems and methods for providing increased computer security

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NRL

In a communication system having a plurality of networks, a method of achieving network separation between first and second networks is described. First and second networks with respective first and second degrees of trust are defined, the first degree of trust being higher than the second degree of trust. Communication between the first and second networks is enabled via a network interface system having a protocol stack, the protocol stack implemented by the network interface system in an application layer. Data communication from the second network to the first network is enabled while data communication from the first network to the second network is minimized.

Inventors: 
Chincheck, Stanley; Kang, Myong Hoon; Moskowitz, Ira S.; Parsonese, Jim
Patent Number: 
US7149897
Technical domain: 
Communications
FIle Date: 
2003-07-25
Grant Date: 
2006-12-12
Grant time: 
1,236 days
Grant time percentile rank: 
22
Claim count percentile rank: 
1
Citations percentile rank: 
1
'Cited by' percentile rank: 
4
Assignee: 
US NAVY

Method for optical control of microwave phase

Patent image
NRL

A method and system for modifying the detected phase of a signal by driving a photodetector into saturation. This system and method differs from current manual and electrical microwave phase modification by using saturation means for modifying the phase. The system and method may use a plurality of the signal generators for saturating the photodetector.

Inventors: 
Currie, Marc; Vurgaftman, Igor; Lou, Janet W.
Patent Number: 
US7755828
Technical domain: 
Communications
FIle Date: 
2007-12-14
Grant Date: 
2010-07-13
Grant time: 
942 days
Grant time percentile rank: 
17
Claim count percentile rank: 
6
Citations percentile rank: 
1
'Cited by' percentile rank: 
1
Assignee: 
US NAVY

Airborne laser-acoustic mine detection system

Patent image
NRL

A system and method is provided for using acoustical pulses generated from an airborne laser source to locate objects under water. An array of acoustic sensors, such as passive sonobuoys at the ocean surface, is deployed in known or determinable locations by aircraft. Each area surrounded by acoustic sensors comprises a search cell, within which sonar scattering data can be used to locate objects. Following sonobuoy deployment, the aircraft uses the laser to rapidly generate many laser-acoustic pulse sources within each search cell, which in turn generate spherical acoustic pulses traveling through the water. The acoustic sensors receive the acoustic pulses, either on a direct path or on a scattered path after the pulse strikes an underwater object. The sensors record the acoustic signatures of the received pulses and transmit data of the recorded acoustic pulses to a processor such as processor on a nearby ship. The processor transforms the data of the acoustic signatures, together with data of the known locations of the acoustic sensors and the locations of the laser-acoustic pulse sources, into data of a location of the underwater objects.

Inventors: 
Jones, Theodore G.; Yang, Tsih C.; Means, Steven L.; Yoo, Kwang B.; Franchi, Edward R.
Patent Number: 
US8223590
Technical domain: 
Communications
FIle Date: 
2010-12-14
Grant Date: 
2012-07-17
Grant time: 
581 days
Grant time percentile rank: 
10
Claim count percentile rank: 
3
Citations percentile rank: 
1
'Cited by' percentile rank: 
1
Assignee: 
US NAVY

Carrier signal suppression and extraction system

Patent image
NRL

A carrier signal extraction system for suppressing and extracting a carrier signal component and transmitting a double sideband component includes a polarized light source for transmitting a polarized light signal output; a polarization modulator with a first input coupled to the polarized light signal output and a second input for adding a modulation signal to the polarized light signal, thereby generating a polarization modulated light output; and a polarizing element having an input coupled to the polarization modulated light output for suppressing and extracting the carrier signal component and preferentially transmitting a double sideband component of the polarization modulated light output.

Inventors: 
Campillo, Anthony L.
Patent Number: 
US7672598
Technical domain: 
Communications
FIle Date: 
2007-05-23
Grant Date: 
2010-03-02
Grant time: 
1,014 days
Grant time percentile rank: 
18
Claim count percentile rank: 
5
Citations percentile rank: 
1
'Cited by' percentile rank: 
1
Assignee: 
US NAVY

Method and apparatus for photonic digital-to-analog conversion

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NRL

A method and apparatus for receiving a digital signal having a plurality of significant bits of resolution. The apparatus includes a mode locked laser comprising a single output. The apparatus also includes a beam divider operable to receive the single output. The apparatus also includes a plurality of optical modulators operable to communicate with said beam divider and operable to receive a respective plurality of signals corresponding to a plurality of significant bits of resolution. Optionally, the apparatus also includes a source operable to output a digital waveform with the plurality of signals corresponding to the plurality of significant bits of resolution of the digital waveform, the plurality of signals operable to drive the plurality of optical modulators.

Inventors: 
Marc, Currie; Janet, Lou W.
Patent Number: 
US8009995
Technical domain: 
Communications
FIle Date: 
2006-09-27
Grant Date: 
2011-08-30
Grant time: 
1,798 days
Grant time percentile rank: 
33
Claim count percentile rank: 
3
Citations percentile rank: 
1
'Cited by' percentile rank: 
1
Assignee: 
US NAVY

Linearized phase modulated analog optical links

Patent image
NRL

A phase-modulated analog optical link that uses parallel interferometric demodulation to mitigate the dominant intermodulation distortion present in the link. A receiver for demodulating phase modulated optical signals includes a splitter dividing the phase modulated signal into parallel optical paths, each optical path having an asymmetrical interferometer, the time delays of the interferometers being unequal, and each optical path includes a photodiode optically connected to an output of the interferometer. Outputs of the photodiodes enter a hybrid coupler. Alternatively, outputs of the interferometer enter a balanced photodetector. A phase shifter or time delay element can be included in one optical path to ensure inputs to the coupler or balanced photodetector have the correct phase. The input power to the parallel optical paths is split in a ratio that balances the third-order distortion in the output photocurrent.

Inventors: 
Mckinney, Jason D.
Patent Number: 
US8103178
Technical domain: 
Communications
FIle Date: 
2009-04-17
Grant Date: 
2012-01-24
Grant time: 
1,012 days
Grant time percentile rank: 
18
Claim count percentile rank: 
6
Citations percentile rank: 
2
'Cited by' percentile rank: 
1
Assignee: 
US NAVY

Airborne laser-acoustic mine detection system

Patent image
NRL

A system and method is provided for using acoustical pulses generated from an airborne laser source to locate objects under water. An array of acoustic sensors, such as passive sonobuoys at the ocean surface, is deployed in known or determinable locations by aircraft. Each area surrounded by acoustic sensors comprises a search cell, within which sonar scattering data can be used to locate objects. Following sonobuoy deployment, the aircraft uses the laser to rapidly generate many laser-acoustic pulse sources within each search cell, which in turn generate spherical acoustic pulses traveling through the water. The acoustic sensors receive the acoustic pulses, either on a direct path or on a scattered path after the pulse strikes an underwater object. The sensors record the acoustic signatures of the received pulses and transmit data of the recorded acoustic pulses to a processor such as processor on a nearby ship. The processor transforms the data of the acoustic signatures, together with data of the known locations of the acoustic sensors and the locations of the laser-acoustic pulse sources, into data of a location of the underwater objects.

Inventors: 
Jones, Theodore G.; Tang, Tsih C.; Means, Steven L.; Franchi, Edward R.; Yoo, Kwang B.
Patent Number: 
US8228760
Technical domain: 
Communications
FIle Date: 
2009-01-06
Grant Date: 
2012-07-24
Grant time: 
1,295 days
Grant time percentile rank: 
23
Claim count percentile rank: 
5
Citations percentile rank: 
1
'Cited by' percentile rank: 
1
Assignee: 
US NAVY

White light emitting device based on polariton laser

Patent image
NRL

A high-efficiency white-light-emitting device that includes a polariton light emitter that emits UV or blue light to a down-converting material that converts the polariton emissions to white light. The polariton light emitter includes an active region situated within a resonant optical cavity formed on a substrate. The down-converting material can comprise a luminophoric phosphor or other material. The polariton light and down-converting material can be arranged in a single apparatus to provide a white-light-emitting device that can be used for lighting and instrumentation. The device can also be configured for high-frequency modulation to provide optical signals for communications and control systems.

Inventors: 
Mastro, Michael A.; Eddy Jr., Charles R.
Patent Number: 
US8237152
Technical domain: 
Communications
FIle Date: 
2009-06-02
Grant Date: 
2012-08-07
Grant time: 
1,162 days
Grant time percentile rank: 
21
Claim count percentile rank: 
7
Citations percentile rank: 
1
'Cited by' percentile rank: 
1
Assignee: 
US NAVY

Method and apparatus for secure digital communications using chaotic signals

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NRL

A system and method for encoding zero and one bits for transmission, including generating a first signal from a non-linear chaotic system to represent the one bit, with the signal's embedded vectors being within the non-linear system's attractor set, and generating a second signal from the non-linear system to represent the zero bit, with the signal's embedded vectors being outside the non-linear system's attractor set. The second signal encoding the zero bit can be generated by adding together two chaotic signals arising from the non-linear system initialized with different initial conditions, and weighting the second signal to have approximately the same energy as the first signal. One suitable chaotic systems is a Lorenz system. Systems and methods for decoding a transmitted stream of signals compare a detection statistic of the received stream of signals to a threshold value that depends on the chaotic system.

Inventors: 
Rohde, Gustavo K.; Nichols, Jonathan M.; Bucholtz, Frank
Patent Number: 
US8385547
Technical domain: 
Communications
FIle Date: 
2007-09-10
Grant Date: 
2013-02-26
Grant time: 
1,996 days
Grant time percentile rank: 
36
Claim count percentile rank: 
3
Citations percentile rank: 
1
'Cited by' percentile rank: 
1
Assignee: 
US NAVY

Wavelength-scaled ultra-wideband antenna array

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NRL

An ultra-wideband antenna array architecture includes a first array of radiating elements, a second array of radiating elements, and a third array of radiating elements, with their respective element widths proportionately ascending in size. In one configuration, the first array radiating element width is half a wavelength at the highest frequency of operation, the second array element width is twice the first width, and the third array element width is twice the second width. The first, second, and third arrays are positioned in a wavelength-scaled lattice wherein the wavelength scaling is based on design operative frequencies and whereby adjacent actively-radiating elements for an operative frequency are aligned so as to produce constructive interference when powered up. Feed means such as a diplexer with a selected-band frequency control then provides power to each array.

Inventors: 
Kindt, Rickie W.; Kragalott, Mark; Parent, Mark G.; Tavik, Gregory C.
Patent Number: 
US8405564
Technical domain: 
Communications
FIle Date: 
2009-11-12
Grant Date: 
2013-03-26
Grant time: 
1,230 days
Grant time percentile rank: 
22
Claim count percentile rank: 
6
Citations percentile rank: 
1
'Cited by' percentile rank: 
1
Assignee: 
US NAVY

Laser-based technique for producing and embedding electrochemical cells and electronic components directly into circuit board materials

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NRL

A method is provided for embedding electronic components including electrochemical cells within a circuit board substrate. The method includes micromachining the printed circuit board substrate to a selective depth to form a recess. A component is inserted into the recess and an electrical connection is established between the electrical component and a metallized pattern of the circuit board substrate using, e.g., laser direct-write.

Inventors: 
Arnold, Craig B.; Pique, Alberto; Auyeung, Ray; Nurnberger, Michael
Patent Number: 
US6986199
Technical domain: 
Communications
FIle Date: 
2004-06-09
Grant Date: 
2006-01-17
Grant time: 
587 days
Grant time percentile rank: 
10
Claim count percentile rank: 
7
Citations percentile rank: 
1
'Cited by' percentile rank: 
1
Assignee: 
US NAVY

Automatic gain control for digitized RF signal processing

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NRL

An automatic gain control RF signal processor for receiver systems, such as radar intercept receivers, includes an attenuator having an input for receiving an analog RF input signal, an amplifier coupled to the attenuator, a bandpass filter coupled to the amplifier output, a single ADC coupled to the bandpass filter, a digital logic circuit, and a FIFO buffer. The digital logic circuit has an input for receiving the ADC output signal, a first output coupled to a variable gain control input of the attenuator, and a second output. The logic circuit includes signal detection logic for detecting the presence of a pulse within the ADC signal, determining a peak amplitude value of the pulse, and based on the peak amplitude value generating an attenuation value at the first output that is applied to the variable gain control input of the attenuator. The sampling logic averages a number of ADC data samples to determine a moving average pulse amplitude, and compares this moving average pulse amplitude to a processing threshold value to determine a delta value with which to adjust an attenuation value for the attenuator, and to determine when to terminate a pulse and reset the attenuation value to zero. The averaging is carried out to determine whether an assigned number m of n samples is above the processing threshold value or whether the pulse should be terminated.

Inventors: 
Nichols, Gregory M.
Patent Number: 
US7088794
Technical domain: 
Communications
FIle Date: 
2002-02-19
Grant Date: 
2006-08-08
Grant time: 
1,631 days
Grant time percentile rank: 
30
Claim count percentile rank: 
5
Citations percentile rank: 
1
'Cited by' percentile rank: 
2
Assignee: 
US NAVY

Ultra-wideband frequency position modulation using nonlinear compressed sensing

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NRL

A Frequency Position Modulation system for encoding signals for transmission. A signal's discrete frequency support is used to represent symbols. The signal can be non-uniformly spread over many GHz of instantaneous bandwidth, resulting in a communications system that is resilient to interference and difficult to intercept. The FPM symbols are recovered using adaptive projections that use an analog polynomial nonlinearity paired with an analog-to-digital converter that is sampling at a rate at that is only a fraction of the instantaneous bandwidth of the signal. In the presence of partial band interference, nonlinearities generated by the transmitter are exploited by the receiver to help unambiguously recover tones that could otherwise be lost. The nonlinearities are generated by driving the power amplifier of the transmitter into saturation to induce distortions at a desired level.

Inventors: 
Goodman, Joel I.; Acosta, Crystal Bertoncini; Cowart, Gregory
Patent Number: 
US9515698
Technical domain: 
Communications
FIle Date: 
2015-12-07
Grant Date: 
2016-12-06
Grant time: 
365 days
Grant time percentile rank: 
6
Claim count percentile rank: 
3
Citations percentile rank: 
1
'Cited by' percentile rank: 
1
Assignee: 
US NAVY

Multiple-buffer queueing of data packets with high throughput rate

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NRL

The present invention is a method and apparatus to buffer data. A buffer memory of a first type stores data associated with a connection identifier corresponding to a channel in a network. The data is organized into at least one chunk based on a linked list. The connection identifier identifies a connection in the channel. The data is part of a data stream associated with the connection. A packet memory of a second type provides access to the stored data when a transfer condition occurs.

Inventors: 
Chu, Tam-anh
Patent Number: 
US7301954
Technical domain: 
Communications
FIle Date: 
2000-09-22
Grant Date: 
2007-11-27
Grant time: 
2,622 days
Grant time percentile rank: 
48
Claim count percentile rank: 
13
Citations percentile rank: 
2
'Cited by' percentile rank: 
1
Assignee: 
US NAVY

Method and apparatus for producing spatialized audio signals

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NRL

A method and apparatus for producing virtual sound sources that are externally perceived and positioned at any orientation in azimuth and elevation from a listener is described. In this system, a set of speakers is mounted in a location near the temple of a listener's head. A head tracking system determines the location and orientation of the listeners head and provides the measurements to a computer which processes audio signals, from an audio source, in conjunction with a head related transfer function (HRTF) filter to produce spatialized audio. The HRTF filter maintains the virtual location of the audio signals/sound, thus allowing the listener to change locations and head orientation without degradation of the audio signal. The audio system of the present invention produces virtual sound sources that are externally perceived and positioned at any desired orientation in azimuth and elevation from the user.

Inventors: 
Ballas, James A.
Patent Number: 
US7415123
Technical domain: 
Communications
FIle Date: 
2005-10-31
Grant Date: 
2008-08-19
Grant time: 
1,023 days
Grant time percentile rank: 
18
Claim count percentile rank: 
3
Citations percentile rank: 
2
'Cited by' percentile rank: 
1
Assignee: 
US NAVY

Antenna calibration method and system

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NRL

A phased array antenna system includes an RF front end, a radome, and an optical calibrator embedded in the radome for enabling in-situ calibration of the RF front end. The optical calibrator employs an optical timing signal generator (OTSG), a Variable Optical Amplitude and Delay Generator array (VOADGA) for receiving the modulated optical output signal and generating a plurality of VOADGA timing signals, and an optical timing signal distributor (OTSD). The in-situ optical calibrator allows for reduced calibration time and makes it feasible to perform calibration whenever necessary.

Inventors: 
Paek, Eung Gi; Parent, Mark G.; Choe, Joon Y.
Patent Number: 
US7671799
Technical domain: 
Communications
FIle Date: 
2008-06-25
Grant Date: 
2010-03-02
Grant time: 
615 days
Grant time percentile rank: 
11
Claim count percentile rank: 
5
Citations percentile rank: 
1
'Cited by' percentile rank: 
1
Assignee: 
US NAVY

System and method for transmitting analog signals with a modulating retroreflector and hybrid amplitude and frequency modulation

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NRL

A system and method for encoding an analog input signal for optical transmission, including driving a voltage controlled oscillator with an analog input signal to produce a frequency modulated electrical signal having a frequency proportional to the amplitude of the input signal, and applying the frequency modulated electrical signal to a multiple quantum well modulating retroreflector. The retroreflector receives optical energy from a laser source and modulates the optical energy with the frequency modulated signal to produce an output optical signal.

Inventors: 
Murphy, James L.; Rabinovich, William S.; Gilbreath, Charmaine G.; Goetz, Peter G.
Patent Number: 
US7715727
Technical domain: 
Communications
FIle Date: 
2006-08-01
Grant Date: 
2010-05-11
Grant time: 
1,379 days
Grant time percentile rank: 
25
Claim count percentile rank: 
7
Citations percentile rank: 
1
'Cited by' percentile rank: 
1
Assignee: 
US NAVY

Shell type actuator

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NRL

A micromechanical resonator is formed on a substrate. The resonator has a partial spherical shell clamped on an outside portion of the shell to the substrate. In other embodiments, a flat disc or other shape may be used. Movement is induced in a selected portion of the disc, inducing easily detectible out-of-plane motion. A laser is used in one embodiment to heat the selected portion of the disc and induce the motion. The motion may be detected by capacitive or interferometric techniques.

Inventors: 
Zalalutdinov, Maxim; Reichenbach, Robert B.; Aubin, Keith; Houston, Brian H.; Parpia, Jeevak M.; Craighead, Harold G.
Patent Number: 
US7812502
Technical domain: 
Communications
FIle Date: 
2006-02-20
Grant Date: 
2010-10-12
Grant time: 
1,695 days
Grant time percentile rank: 
31
Claim count percentile rank: 
8
Citations percentile rank: 
1
'Cited by' percentile rank: 
1
Assignee: 
CORNELL UNIV

System and method for interactive spatio-temporal streaming data

Patent image
NRL

System and method for providing a probabilistic order of tiles relative to a current section of a video that a user is viewing. A cache implementation uses this ordering to decide what tiles to evict from the cache, i.e. which tiles will probably not be accessed within a particular timeframe, but not when to evict (this is up to the cache implementation). A cache implementation can also use the prioritized list of the present embodiment to pre-fetch tiles.

Inventors: 
Michael, Christopher J.; Lin, Bruce Y.; Ioup, Elias Z. K.; Sample, John T.
Patent Number: 
US9043848
Technical domain: 
Communications
FIle Date: 
2014-03-10
Grant Date: 
2015-05-26
Grant time: 
442 days
Grant time percentile rank: 
8
Claim count percentile rank: 
3
Citations percentile rank: 
1
'Cited by' percentile rank: 
1
Assignee: 
US NAVY

Means for low probability of interception/detection underwater acoustic communications

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NRL

A direct-sequence spread-spectrum communications method of de-spreading and decoding received data transmitted through an acoustic channel. A first code match filter is applied to receive data to output a first code impulse response comprising a channel impulse response modulated by a pseudo-random number bit. A second code match filter is applied to the received data to output a second code impulse response comprising the channel impulse response modulated by a message symbol bit. The first code impulse response is correlated with the second code impulse response to output the message symbol bit modulated by the pseudo-random number bit. The pseudo-random number bit is eliminated to identify the message symbol bit, thereby decoding the message symbol bit from the received data.

Inventors: 
Yang, Tsih C.
Patent Number: 
US7912114
Technical domain: 
Communications
FIle Date: 
2008-03-19
Grant Date: 
2011-03-22
Grant time: 
1,098 days
Grant time percentile rank: 
20
Claim count percentile rank: 
2
Citations percentile rank: 
1
'Cited by' percentile rank: 
1
Assignee: 
US NAVY

Retransmission switch box

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An apparatus for use with a first data device, a second data device, and a third data device operable to generate one of directly and indirectly an interrupt signal and to disable one of directly and indirectly the interrupt signal. The apparatus includes a switch connectable to the first data device, the second data device, and the third data device, the switch in a first state connecting the first data device and the second data device, the switch in a second state being operable, upon detection by the switch of the interrupt signal, to disconnect automatically the first data device from the second data device and to connect automatically thereafter the first data device to said the data device.

Inventors: 
Taibi, Daniel; Roberts, Robert; Vandersall, Eric
Patent Number: 
US8189560
Technical domain: 
Communications
FIle Date: 
2008-05-30
Grant Date: 
2012-05-29
Grant time: 
1,460 days
Grant time percentile rank: 
26
Claim count percentile rank: 
3
Citations percentile rank: 
1
'Cited by' percentile rank: 
1
Assignee: 
US NAVY

Even-order harmonic cancellation and increased RF gain using dual-output mach-zehnder modulator with two wavelength input

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A method and system for processing analog optical signals to produce a single RF output free from even-order harmonic distortion. Two analog optical signals of different wavelengths λ1, λ2 are input into a dual-output Mach-Zehnder modulator (MZM), where one wavelength input is high-biased and one wavelength is low-biased. The complementary high- and low-biased wavelengths are output from each arm of the MZM to a multiplexer, which filters out the unwanted high- or low-biased wavelengths from each MZM arm so that both wavelengths are low-biased or high-biased. The signals are passed to a pair of photodiodes, and the photocurrents from the photodiodes are differenced to produce the final RF output. Because of the complementary phase differences between the two low- or high-biased signals generating the photocurrent, all components of the photocurrent except the fundamental and odd-order harmonics cancel each other, resulting in a high-quality RF output free from harmonic distortion.

Inventors: 
Devgan, Preetpaul S.; Urick, Vincent J.; Williams, Keith J.; Diehl, John F.; Sunderman, Christopher E.
Patent Number: 
US8224188
Technical domain: 
Communications
FIle Date: 
2010-01-15
Grant Date: 
2012-07-17
Grant time: 
914 days
Grant time percentile rank: 
16
Claim count percentile rank: 
4
Citations percentile rank: 
1
'Cited by' percentile rank: 
1
Assignee: 
US NAVY

Frequency-agile frequency-selective variable attenuator

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A method of tuning the stopband attenuation of an absorptive bandstop filter having at least a first and second resonator, where the first resonator includes a first tuning element that exhibits a first resonant frequency, the second resonator includes a second tuning element that exhibits a second resonant frequency, and the tuning elements are used to adjust the corresponding resonant frequencies, includes 1) adjusting the first resonant frequency using the first tuning element; and 2) adjusting the second resonant frequency using the second tuning element, such that both resonant frequencies are coordinated to obtain a selected stopband attenuation level and to thus realize a frequency-selective variable attenuator.

Inventors: 
Jachowski, Douglas R.
Patent Number: 
US8305164
Technical domain: 
Communications
FIle Date: 
2010-06-09
Grant Date: 
2012-11-06
Grant time: 
881 days
Grant time percentile rank: 
16
Claim count percentile rank: 
2
Citations percentile rank: 
1
'Cited by' percentile rank: 
1
Assignee: 
US NAVY

Ultra-wideband antenna element and array

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An antenna element for fabricating into a linear or planar array includes a tapered slot along a main axis of the antenna element body that extends from a first slot end, defined by an outwardly flared opening at a second end of the antenna element, into a second meandering portion that is offset from the main axis, and then into a second slot end having a bend with respect to the main axis, and finally into a slot-line cavity proximate to the first end of the antenna element body. A feed port extends into the antenna element body from the outer surface of the first end of the antenna element body into the second slot end bend adjacent the slot-line cavity.

Inventors: 
Kindt, Rickie W.
Patent Number: 
US8350773
Technical domain: 
Communications
FIle Date: 
2010-06-03
Grant Date: 
2013-01-08
Grant time: 
950 days
Grant time percentile rank: 
17
Claim count percentile rank: 
6
Citations percentile rank: 
1
'Cited by' percentile rank: 
1
Assignee: 
US NAVY

Wideband horizontally polarized omnidirectional antenna

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A wideband horizontally polarized antenna includes a metallic antenna housing having four sides, a rectangular or hourglass slot in each side that is preferably offset from center, a square coaxial transmission or feed line positioned along a central axis of the metallic antenna housing, and a metal tab connecting each of the slots to the feed line. The antenna operates over a wide bandwidth and has a small profile.

Inventors: 
Pickles, William R.
Patent Number: 
US8779998
Technical domain: 
Communications
FIle Date: 
2011-08-26
Grant Date: 
2014-07-15
Grant time: 
1,054 days
Grant time percentile rank: 
19
Claim count percentile rank: 
2
Citations percentile rank: 
1
'Cited by' percentile rank: 
1
Assignee: 
US NAVY

System and method for radio-frequency fingerprinting as a security layer in RFID devices

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A system and method for authenticating a radio-frequency identification tags based on the features of the modulation features of the RFID signal. Dynamic wavelet fingerprint features are extracted from the signal by applying a wavelet transform to the signal to determine wavelet coefficients at a plurality of times and frequency scale values, creating a binary image from the wavelet coefficients, and measuring image features of at least one fingerprint object in the binary image. The measured features of the binary image fingerprint objects are compared to a database of features for the signal's EPC to authenticate the RFID tag.

Inventors: 
Bertoncini, Crystal A.; Rudd, Kevin E.; Nousain, Bryan D.; Hinders, Mark K.
Patent Number: 
US8810404
Technical domain: 
Communications
FIle Date: 
2011-04-01
Grant Date: 
2014-08-19
Grant time: 
1,236 days
Grant time percentile rank: 
22
Claim count percentile rank: 
5
Citations percentile rank: 
1
'Cited by' percentile rank: 
5
Assignee: 
US NAVY

Method and apparatus for conservative motion estimation from multi-image sequences

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Apparatus and methods are presented for estimating the velocity field based on a multi-image frame sequence having an integer number M frames, M is greater than two, in which a set of M−1 displaced frame difference (DFD) equations is solved using a set of iteration equations to determine a velocity field.

Inventors: 
Chen, Wei
Patent Number: 
US8891831
Technical domain: 
Communications
FIle Date: 
2011-12-13
Grant Date: 
2014-11-18
Grant time: 
1,071 days
Grant time percentile rank: 
19
Claim count percentile rank: 
4
Citations percentile rank: 
1
'Cited by' percentile rank: 
1
Assignee: 
US NAVY

Fixed and varactor-tuned bandstop filters with spurious suppression

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A bandstop filter configured to suppress a spurious resonance frequency includes a resonator and a transmission line that is coupled to the resonator at a first junction and at a second junction with a length θ of transmission line running between the two couplings. The configuration provides two signal paths so that constructive interference occurs at the spurious resonance, and destructive interference occurs at a fundamental bandstop frequency. This provides spurious suppression by effectively cancelling out resonator couplings via the constructive interference, extending the upper passband of the bandstop filter to any degree required by the application.

Inventors: 
Guyette, Andrew C.
Patent Number: 
US8912868
Technical domain: 
Communications
FIle Date: 
2012-07-20
Grant Date: 
2014-12-16
Grant time: 
879 days
Grant time percentile rank: 
16
Claim count percentile rank: 
5
Citations percentile rank: 
1
'Cited by' percentile rank: 
1
Assignee: 
US NAVY

Laser ablation technique for electrical contact to buried electrically conducting layers in diamond

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A method of laser ablation for electrical contact to a buried electrically conducting layer in diamond comprising polishing a single crystal diamond substrate having a first carbon surface, implanting the diamond with a beam of 180 KeV followed by 150 KeV C+ ions at fluencies of 4×1015 ions/cm2 and 5×1015 ions/cm2 respectively, forming an electrically conducting carbon layer beneath the first carbon surface, and ablating the single crystal diamond which lies between the electrically conducting layer and the first carbon surface.

Inventors: 
Pate, Bradford B.; Ray, Matthew P.; Baldwin, Jeffrey W.
Patent Number: 
US9040345
Technical domain: 
Communications
FIle Date: 
2013-03-13
Grant Date: 
2015-05-26
Grant time: 
804 days
Grant time percentile rank: 
14
Claim count percentile rank: 
3
Citations percentile rank: 
1
'Cited by' percentile rank: 
1
Assignee: 
US NAVY

Microwave photonic true-time-delay

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A true time delay system and method for an optical carrier signal modulated with a microwave signal. The system includes a beam deflector, with the optical signal being imaged onto the beam deflector, a stationary reflective diffractive grating arranged in a Littrow configuration, a focusing element arranged between the beam deflector and the stationary reflective diffractive grating. In operation, the beam deflector steers the optical beam across the clear aperture of the focusing element and the focusing element transmits the steered beam to the reflective diffractive grating. A change in optical path length experienced by the optical beam as the beam is scanned across the grating surface results in a relative phase delay in the optical beam. The beam deflector can be a rotating mirror, an acousto-optic beam deflector, or an electro-optic beam deflector. The focusing element can be a lens or a curved mirror.

Inventors: 
Schermer, Ross; Bucholtz, Frank; Villarruel, Carl A.
Patent Number: 
US9007597
Technical domain: 
Communications
FIle Date: 
2012-06-04
Grant Date: 
2015-04-14
Grant time: 
1,044 days
Grant time percentile rank: 
19
Claim count percentile rank: 
8
Citations percentile rank: 
1
'Cited by' percentile rank: 
1
Assignee: 
US NAVY

Method for mobile underwater acoustic communications

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A method for mobile underwater acoustic communications includes double differentially (DD) encoding a communication signal to produce a DD-encoded communication signal, applying direct sequence spread spectrum (SS) to the DD-encoded signal to produce a DD-SS communication output signal, and transmitting the DD-SS communication output signal. The method i) increases the SNR via processing gain, ii) eliminates the ISI through multipath suppression, and iii) enables bandwidth efficiency improvement via data multiplexing. The method is shown capable of facilitating simple receiver processing and offering performance robustness against unpredictable channel fluctuations.

Inventors: 
Liu, Zhiqiang
Patent Number: 
US9030918
Technical domain: 
Communications
FIle Date: 
2013-03-12
Grant Date: 
2015-05-12
Grant time: 
791 days
Grant time percentile rank: 
14
Claim count percentile rank: 
2
Citations percentile rank: 
1
'Cited by' percentile rank: 
1
Assignee: 
US NAVY

Method and apparatus for displacement determination by motion compensation

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Motion estimator apparatus and methods are presented in which a fully constrained nonlinear system of equations combing forward and backward displaced frame difference (DFD) equations with a plurality of displacement vector invariant (DVI) equations is solved using the input data from two image frames without approximation and without imposing any additional constraints or assumptions to obtain an estimated displacement field. Also presented is an adaptive framework for solving a system of motion estimation equations.

Inventors: 
Chen, Wei
Patent Number: 
US8781165
Technical domain: 
Communications
FIle Date: 
2011-12-13
Grant Date: 
2014-07-15
Grant time: 
945 days
Grant time percentile rank: 
17
Claim count percentile rank: 
6
Citations percentile rank: 
2
'Cited by' percentile rank: 
1
Assignee: 
US NAVY

Deployable satellite reflector with a low passive intermodulation design

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A passive intermodulation modulation reducing structure for a multicarrier reflector system, including a plurality of flexible reflector gores, each gore having a thin layer of conductive metal, a first layer of dielectric material laminated to one face of the conductive metal, and a second layer of dielectric material laminated to an opposite face of the conductive metal. Capacitive coupling joins the reflector's RF components. The structure can be a deployable parabolic reflector for a satellite antenna.

Inventors: 
Nurnberger, Michael W.; Amend, Christopher P.
Patent Number: 
US9112282
Technical domain: 
Communications
FIle Date: 
2013-01-07
Grant Date: 
2015-08-18
Grant time: 
953 days
Grant time percentile rank: 
17
Claim count percentile rank: 
4
Citations percentile rank: 
1
'Cited by' percentile rank: 
1
Assignee: 
US NAVY

System and method for automated bottom feature navigator

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System and method for generating vehicle position fixes for an underwater vehicle based on images of a target object on the seafloor. The position of the target object is estimated based on a selected pixel on the target. For each image of the target, there is a different selected pixel, and a different uncertainty associated with the target location based on the selected pixel. Vehicle position fixes for the underwater vehicle are computed based on an analysis of the selected pixels for each target, the uncertainties of the selected pixel positions, the location and uncertainty of location of the vehicle collecting the pixel positions, and other information collected about the target.

Inventors: 
Bourgeois, Brian S.; Dubberley, John R.; Russell, Jeffrey A.; Gendron, Marlin L.
Patent Number: 
US9432637
Technical domain: 
Communications
FIle Date: 
2014-03-07
Grant Date: 
2016-08-30
Grant time: 
907 days
Grant time percentile rank: 
16
Claim count percentile rank: 
5
Citations percentile rank: 
1
'Cited by' percentile rank: 
1
Assignee: 
US NAVY

Ultra-wideband frequency position modulation using nonlinear compressed sensing

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A Frequency Position Modulation system for encoding signals for transmission. A signal's discrete frequency support is used to represent symbols. The signal can be non-uniformly spread over many GHz of instantaneous bandwidth, resulting in a communications system that is resilient to interference and difficult to intercept. The FPM symbols are recovered using adaptive projections that use an analog polynomial nonlinearity paired with an analog-to-digital converter that is sampling at a rate at that is only a fraction of the instantaneous bandwidth of the signal. In the presence of partial band interference, nonlinearities generated by the transmitter of are exploited by the receiver to help unambiguously recover tones that could otherwise be lost. The nonlinearities are generated by driving the power amplifier of the transmitter into saturation to induce distortions at a desired level.

Inventors: 
Goodman, Joel I.; Acosta, Crystal Bertoncini; Cowart, Gregory
Patent Number: 
US9209861
Technical domain: 
Communications
FIle Date: 
2014-03-17
Grant Date: 
2015-12-08
Grant time: 
631 days
Grant time percentile rank: 
11
Claim count percentile rank: 
2
Citations percentile rank: 
1
'Cited by' percentile rank: 
1
Assignee: 
US NAVY

Compressive beamforming

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A method of antenna array processing. Digitized time-series data from a plurality of antenna elements are divided into a plurality of time windows. A Fourier Transform is performed on a time window of the plurality of time windows for each antenna element of the plurality of antenna elements to generate a plurality of frequency domain vectors. The plurality of antenna elements is divided into a plurality of largest aperture sub-arrays. The frequency domain vectors are compressive beamformed tor the each sub-array to generate a plurality of bearing estimates corresponding to the plurality of sub-arrays. The plurality of bearing estimates from the plurality of sub-arrays are sparsely combined to generate a plurality of frequency-specific bearing estimates. The plurality of frequency-specific bearing estimates are incoherently averaged over a range of frequencies to generate a bearing for a bearing-timing record. A plurality of bearings for the bearing-timing record is generated.

Inventors: 
Edelmann, Geoffrey F.; Gaumond, Charles F.
Patent Number: 
US9231303
Technical domain: 
Communications
FIle Date: 
2013-06-12
Grant Date: 
2016-01-05
Grant time: 
937 days
Grant time percentile rank: 
17
Claim count percentile rank: 
6
Citations percentile rank: 
1
'Cited by' percentile rank: 
1
Assignee: 
US NAVY

Device with a single crystal diamond substrate with a buried electrically conducting layer

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A device comprising a single crystal diamond substrate with a buried electrically conducting layer with μm square openings spaced apart milled into the diamond by ablating the carbon above wherein the step of ablating uses a diode pumped tripled Nd:YAG laser at 355 nm and wherein the square openings have electrical contacts and wherein the resistance measured between the square openings is dominated by the buried electrically conducting layer and on the order of about 1 kΩ.

Inventors: 
Pate, Bradford B.; Ray, Matthew P.; Baldwin, Jeffrey W.
Patent Number: 
US9295152
Technical domain: 
Communications
FIle Date: 
2015-04-14
Grant Date: 
2016-03-22
Grant time: 
343 days
Grant time percentile rank: 
6
Claim count percentile rank: 
3
Citations percentile rank: 
1
'Cited by' percentile rank: 
1
Assignee: 
US NAVY

System and method for testing the speed of a microwave photonics system

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A system testing the speed of a microwave photonic system, having a Mach Zehnder interferometer that includes a first arm with a photonic system to be tested and an amplifier arranged to amplify the output of the photonic system, and a second arm with an attenuator configured to match the output power of the amplifier, with at least one filter arranged at the output of the Mach Zehnder interferometer, the filter having a pass band that includes the center frequency of a continuous wave microwave signal applied to the Mach Zehnder interferometer arms. A continuous wave microwave signal is applied to the input of the Mach Zehnder interferometer, a signal is applied to only the second arm with the photonic link, and the output of the bandpass filter is measured with an oscilloscope and a microwave power detector.

Inventors: 
Schermer, Ross; Bucholtz, Frank; Villarruel, Carl A.
Patent Number: 
US9356692
Technical domain: 
Communications
FIle Date: 
2015-04-09
Grant Date: 
2016-05-31
Grant time: 
418 days
Grant time percentile rank: 
7
Claim count percentile rank: 
1
Citations percentile rank: 
1
'Cited by' percentile rank: 
1
Assignee: 
US NAVY

Bent-pipe relay communication system with automatic gain control and methods of using same

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A bent-pipe relay communication system and method of using same. The bent-pipe relay communication system includes a plurality of bent-pipe relay channels, each channel having automatic gain control. Each channel of the plurality of bent-pipe relay channels includes a radio -frequency-to-intermediate-frequency demodulator, at least one programmable variable gain amplifier, and an intermediate-frequency-to-radio-frequency modulator. The communication system further includes at least one radio frequency power detector operably connected to the intermediate-frequency-to-radio-frequency modulator for each channel. The system also includes at least one controller communicating with the at least one radio frequency power detector and the at least one variable gain amplifier for the each channel to provide the automatic gain control.

Inventors: 
Cohen, Aaron E.
Patent Number: 
US9461731
Technical domain: 
Communications
FIle Date: 
2015-12-09
Grant Date: 
2016-10-04
Grant time: 
300 days
Grant time percentile rank: 
5
Claim count percentile rank: 
6
Citations percentile rank: 
1
'Cited by' percentile rank: 
1
Assignee: 
US NAVY

Method of code generation that minimizes error propagation

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A method of generating a code that minimizes error propagation by selecting integers m, n, mrl, and a range of fractions od, where m represents the number of bits in an unencoded sequence, where n represents the number of bits in an encoded sequence, where mrl represents the maximum run length of an encoded sequence, and where od represents a range of ones densities of an encoded sequence. Next, generating an encoding map M that maps each unencoded sequence to an n-bit encoded sequence that satisfies od and mrl. Next, generating a decoding map N that maps each n-bit sequence to an m-bit sequence. Next, determining an error-propagation score for M and N. Then, returning to the step of generating M if a user requires a lower error-propagation score.

Inventors: 
Mcadoo Jr., Leslie Newton; Evasius, Dean M.
Patent Number: 
US7676725
Technical domain: 
Communications
FIle Date: 
2006-02-27
Grant Date: 
2010-03-09
Grant time: 
1,471 days
Grant time percentile rank: 
27
Claim count percentile rank: 
3
Citations percentile rank: 
2
'Cited by' percentile rank: 
1
Assignee: 
NATIONAL SECURITY AGENCY

Method of identifying invalid digital signatures involving batch verification

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Method of identifying invalid digital signatures involving batch verification by receiving digital messages, digital signatures, and signer identifiers, computing Z0 as a function of the received information, and determining if the digital signatures are valid. If so, stopping. If not, assigning a signature identifier to each digital signature, setting w equal to 1, computing Zw as a function of the received information and signature identifiers, and searching for a multiplicative relationship amongst Z0, Z1, . . . , Zw. If one is found then determining the invalid digital signatures from the multiplicative relationship and stopping. Otherwise, incrementing w and returning to the step of computing for additional processing if desired.

Inventors: 
Law, Laurie E.; Matt, Brian J.
Patent Number: 
US7890763
Technical domain: 
Communications
FIle Date: 
2007-09-14
Grant Date: 
2011-02-15
Grant time: 
1,250 days
Grant time percentile rank: 
22
Claim count percentile rank: 
7
Citations percentile rank: 
2
'Cited by' percentile rank: 
1
Assignee: 
NATIONAL SECURITY AGENCY

Device for and method of collision-free hashing for near-match inputs

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A device and method of collision-free hashing of near-match inputs that includes the following components. An adder for receiving an input i, a check value cv, and outputs n, which is greater than or equal to the sum of i and cv. A checker for receiving a value n, a value d, a first polynomial, and an output at which the first polynomial appears if the checker determines that the first polynomial is of degree proportional to d and divides xn+1. A factorization block for factoring the first polynomial into a second polynomial and a third polynomial. A first division block for dividing an input of bit length i by the second polynomial to generate a first portion of the hash of the input. A second division block for dividing the input by the third polynomial to generate a second portion of the hash of the input.

Inventors: 
Newhart, Donald W.
Patent Number: 
US8363825
Technical domain: 
Communications
FIle Date: 
2009-05-21
Grant Date: 
2013-01-29
Grant time: 
1,349 days
Grant time percentile rank: 
24
Claim count percentile rank: 
2
Citations percentile rank: 
1
'Cited by' percentile rank: 
1
Assignee: 
NATIONAL SECURITY AGENCY

Device for and method of controlled multilevel chain of trust/revision

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A device and method of controlled, multilevel chain of trust/revision by certifying of each user, device, action, and circumstance in the creation, modification, and transmission of computer information, including a revision history of any modification, and identification of any uncertified computer object used.

Inventors: 
Alexander, Keith B.; Dowd, Patrick W.
Patent Number: 
US9467299
Technical domain: 
Communications
FIle Date: 
2014-03-19
Grant Date: 
2016-10-11
Grant time: 
937 days
Grant time percentile rank: 
17
Claim count percentile rank: 
4
Citations percentile rank: 
1
'Cited by' percentile rank: 
1
Assignee: 
NATIONAL SECURITY AGENCY

Method of elliptic curve digital signature using coefficient splitting

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A method of generating and verifying a cryptographic digital signature using coefficient splitting. The digital signature is formed by first selecting a finite field, an elliptic curve of a first type or a second type, a point P, an integer w1, and an integer k1. Next, generating, via coefficient splitting, a point W=w1P and a point K=k1P. Next, transforming, K to a bit string K*. Next, combining K*, W, and a message M in a first manner to produce h1, and in a second manner to produce c. Next, generating s be either s=h1w1+ck1 (mod q), s=(h1w1+c)/k1 (mod q), or s=(h1k1+c)/w1 (mod q). Next, forming the cryptographic digital signature as (K*,s). The digital signature is verified by acquiring the finite field, the elliptic curve, the point P, the point W, the message M, and the cryptographic digital signature (K*,s). Next, computing h1 and c. Next, selecting (n0, n1) from (sc−1 (mod q), −h1c−1 (mod q)), (cs−1 (mod q), h1s−1 (mod q)) or (−ch1−1 (mod q), sh1−1 (mod q)). Next, generating the point n0P via coefficient splitting. Next, generating the point n1W via coefficient splitting. Next, summing the points computed in the last two steps and designating the sum Q. Next, transforming Q to Q*. Lastly, verifying the digital signature (K*,s) if Q*=K*. Otherwise rejecting the cryptographic digital signature (K*,s) as unverified.

Inventors: 
Solinas, Jerome A.
Patent Number: 
US7062043
Technical domain: 
Communications
FIle Date: 
2002-06-28
Grant Date: 
2006-06-13
Grant time: 
1,446 days
Grant time percentile rank: 
26
Claim count percentile rank: 
5
Citations percentile rank: 
1
'Cited by' percentile rank: 
2
Assignee: 
NATIONAL SECURITY AGENCY

Method of amplifying a digital signal and device therefor

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An efficient method of amplifying a digital signal with reduced electromagnetic interference is disclosed. The invention applies an average amplitude detector to the input signal to control the clock frequency of a pseudo-random number generator so that the clock signal decreases when the average amplitude of the signal increases. The input signal and the pseudo-random number generator are compared to generate a control signal for a switching power amplifier followed by a low-pass filter. When the average amplitude of the input signal falls below a pre-determine threshold, the switching amplifier is placed in a sleep mode.

Inventors: 
Kuehnel, Richard John
Patent Number: 
US7400194
Technical domain: 
Communications
FIle Date: 
2006-06-08
Grant Date: 
2008-07-15
Grant time: 
768 days
Grant time percentile rank: 
14
Claim count percentile rank: 
1
Citations percentile rank: 
1
'Cited by' percentile rank: 
1
Assignee: 
NATIONAL SECURITY AGENCY

Range limited antenna

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NSA

Range limited antenna includes at least two sets of antenna elements and an RF signal processing network connected to each set of antenna elements. The network has a function, F(Ξ,x)=ΦA(x)−ΦB(x)+ΦC(x)−ΦD(x) . . . +ΦN−1(x)−ΦN(x), where x is a signal, ΦA(x) is the phase angle of signal x at the first element set, ΦB(x) is the phase angle of signal x at the second element set, ΦN(x) is the phase angle of signal x at the set N, and Ξ contains all additional parameters which bear on the system. The network is configured to pass a signal for which F(Ξ,x)>ε, where ε is a threshold amount, such that the antenna has gain to signals within a radius and has attenuation outside the radius.

Inventors: 
Althouse, Mark L. G.
Patent Number: 
US7642986
Technical domain: 
Communications
FIle Date: 
2007-09-19
Grant Date: 
2010-01-05
Grant time: 
839 days
Grant time percentile rank: 
15
Claim count percentile rank: 
6
Citations percentile rank: 
1
'Cited by' percentile rank: 
1
Assignee: 
NATIONAL SECURITY AGENCY

Method of removing noise and interference from signal

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A method of removing noise and interference from a signal by receiving the signal, calculating a joint time-frequency domain of the signal, estimating instantaneous frequencies of the joint time-frequency domain, modifying each estimated instantaneous frequency, if necessary, to correspond to a frequency of the joint time-frequency domain to which it most closely compares, redistributing the elements within the joint time-frequency domain according to the estimated instantaneous frequencies as modified, computing a magnitude for each element in the joint time-frequency domain as redistributed, plotting the results as the time-frequency representation of the signal, identifying in the plot any noise and interference components in the received signal, eliminating from the redistributed joint time-frequency domain elements that correspond to noise and interference, and recovering a signal devoid of noise and interference from the modified redistributed joint time-frequency domain.

Inventors: 
Nelson, Douglas J.; Smith, David C.
Patent Number: 
US7676046
Technical domain: 
Communications
FIle Date: 
2005-06-09
Grant Date: 
2010-03-09
Grant time: 
1,734 days
Grant time percentile rank: 
31
Claim count percentile rank: 
4
Citations percentile rank: 
1
'Cited by' percentile rank: 
2
Assignee: 
NATIONAL SECURITY AGENCY

Building a digital camera fingerprint from cropped or corrupted images

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A method of identifying a digital camera is disclosed. First and second digital images generated by the camera have dimensions that are not equal. The method includes calculating noise residuals and normalized cross-correlations (NCCs) between the noise residuals corresponding to candidate translations. The method further includes calculating a noise floor and identifying first and second peak values corresponding to translations. The method further includes calculating a peak ratio, determining that the peak ratio exceeds an alignment threshold and calculating a digital camera fingerprint for the digital camera based on the noise residuals and the first translation. The method further includes receiving a digital image, calculating a noise residual of the digital image, and determining that the image was generated by the digital camera based on the noise residual and the fingerprint and generating a record associating the image with the camera.

Inventors: 
Charlton, Sarah T.; Martin, Carla D.
Patent Number: 
US9525866
Technical domain: 
Communications
FIle Date: 
2016-04-18
Grant Date: 
2016-12-20
Grant time: 
246 days
Grant time percentile rank: 
4
Claim count percentile rank: 
6
Citations percentile rank: 
1
'Cited by' percentile rank: 
1
Assignee: 
US DIRECTOR NAT SECURITY AGENC

Coherent demodulation of ais-GMSK signals in co-channel

Patent image
NSA

The present invention pertains to demodulation of GMSK signals by estimating a carrier frequency of the signal having a carrier residual, basebanding the signal, tracking the signal's carrier frequency, removing the carrier residual, detecting a data burst, generating a bank of poly-bit matched filters, applying the bank of poly-bit matched filters to the signal, determining a magnitude and phase of the output of each poly-bit filter of the bank of poly-bit matched filters, determining a maximum magnitude, determining the location of a baud center, generating a plurality of correlation signals by applying the bank of poly-bit matched filters at the baud center, estimating a carrier phase, removing the estimated carrier phase, applying a Viterbi decoding algorithm to the signal, and estimating the transmitted data sequence.

Inventors: 
Nelson, Douglas J.
Patent Number: 
US8275077
Technical domain: 
Communications
FIle Date: 
2010-10-13
Grant Date: 
2012-09-25
Grant time: 
713 days
Grant time percentile rank: 
13
Claim count percentile rank: 
1
Citations percentile rank: 
1
'Cited by' percentile rank: 
1
Assignee: 
US DIRECTOR NAT SECURITY AGENC

Device for and method of computer intrusion anticipation, detection, and remediation

Patent image
NSA

Electronic network security by establishing a network topology, including multiple devices, where the network includes a command and control layer and a transport layer, where the command and control layer is changeable by the transport layer and vice versa. All phases of an intrusion attempt are monitored to anticipate an intrusion, prevent an intrusion, and remedy a successful intrusion. An assessment of the threat is made in multiple dimensions. The topology of the network may be changed in accordance with the threat assessment. In addition, computer traffic in the network and from the intrusion source may be modified or stopped to guard against an intrusion, prevent an intrusion, and remedy a successful intrusion. The command and control layer is changeable by the transport layer and vice versa.

Inventors: 
Alexander, Keith B.; Dowd, Patrick W.; Grossman, Robert L.
Patent Number: 
US8898784
Technical domain: 
Communications
FIle Date: 
2013-05-29
Grant Date: 
2014-11-25
Grant time: 
545 days
Grant time percentile rank: 
9
Claim count percentile rank: 
4
Citations percentile rank: 
1
'Cited by' percentile rank: 
1
Assignee: 
GOVERNMENT OF THE UNITED STATES AS REPRESENTED BY THE DIRECTOR NATIONAL SECURITY AGENCY

Method of acknowledging receipt of data packets

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NSA

A method of acknowledging receipt of data packets, where each data packet has an identification number. A counter is set to the identification number of the first data packet expected. A data packet is then received. If the data precedes the expected data packet then it is discarded. If the data packet has an identification number greater than what is expected and not already stored then it is stored because it is out of order. If the received packet is as expected then it is delivered and the counter is incremented. If the counter equals an identification number of a stored data packet then that packet is delivered along with any other stored data packet contiguous there with, with respect to identification number, the counter is set to one plus the highest identification number of a delivered data packet, and the delivered data packets are deleted from storage. An acknowledgement message is constructed which list the gaps in the stored data packets. Each gap is identified by the first and last identification number of the gap. If additional processing is desired then another data packet is received and processed as above. Otherwise, the acknowledgement message is sent.

Inventors: 
Redeske, Thomas G.
Patent Number: 
US6957374
Technical domain: 
Communications
FIle Date: 
2002-04-23
Grant Date: 
2005-10-18
Grant time: 
1,274 days
Grant time percentile rank: 
23
Claim count percentile rank: 
1
Citations percentile rank: 
1
'Cited by' percentile rank: 
1
Assignee: 
NATIONAL SECURITY AGENCY

Method of elliptic curve digital signature using expansion in joint sparse form

Patent image
NSA

A method of generating and verifying a cryptographic digital signature using joint sparse expansion by a signer first selecting a field, an elliptic curve over the field, a point P of order q on the elliptic curve, w, k. Next, generating W=wP and K=kP. Next, transforming K to K*. Next, combining K*, W, and a message M to produce h. Next, combining K*, W, and M to produce c. Next, generating, s by either s=hw+ck (mod q), s=(hw+c)/k (mod q), or s=(hk+c)/w (mod q). Next, forming the digital signature as (K*,s). Next, a verifier acquires the field, the elliptic curve, P, W, M, and (K*,s). Next, computing h and c. Next, selecting (n0, n1) as either (sc−1 (mod q), −hc−1 (mod q)), (cs−1 (mod q), hs−1 (mod q)) or (−ch−1 (mod q), sh−1 (mod q)). Next, generating binary expansions of n0 and n1 in joint sparse form. Next, computing, Q=n0P+n1W via twin multiplication and a double-add-subtract method with the binary expansions in joint sparse form. Next, transforming, Q to Q*. Lastly, verifying, the digital signature if Q*=K*.

Inventors: 
Solinas, Jerome A.
Patent Number: 
US7024559
Technical domain: 
Communications
FIle Date: 
2002-06-28
Grant Date: 
2006-04-04
Grant time: 
1,376 days
Grant time percentile rank: 
25
Claim count percentile rank: 
4
Citations percentile rank: 
1
'Cited by' percentile rank: 
1
Assignee: 
NATIONAL SECURITY AGENCY

Reusable tamper evident security device

Patent image
NSA

A reusable tamper-evident security device for use on a door or container includes a pair of base members, a pair of first leg members, a pair of second leg members, a pair of U-shaped upper members, and a pair of removable security label blanks. A base member, a first leg member, a second leg member, and a U-shaped upper member are abutted, form an inner cavity between the base member and the U-shaped upper member. At least one mounting hole is provided to affix the base member to the door or container. A first guide and a parallel second guide extent perpendicularly from the top surface of the base member, allowing the removable security label blank to be slidably inserted. The U-shaped upper member abutting each base member is oriented to form an oblong shape when the two base members are adjacent the other. An optional security label may be applied to the removable security label blank.

Inventors: 
Lassen, David
Patent Number: 
US7201410
Technical domain: 
Communications
FIle Date: 
2005-01-28
Grant Date: 
2007-04-10
Grant time: 
802 days
Grant time percentile rank: 
14
Claim count percentile rank: 
6
Citations percentile rank: 
1
'Cited by' percentile rank: 
1
Assignee: 
NATIONAL SECURITY AGENCY

Device for and method of network routing

Patent image
NSA

A device and method of routing traffic in a network by receiving the network, assigning a maximum temperature value to gateway nodes, calculating temperature values for router nodes, determining self-utilization values for nodes, determining neighborhood-utilization values for router nodes, determining pressure values for gateway nodes, determining pressure values for router nodes, identifying router node sent traffic, identifying neighboring nodes having higher temperatures than router node, identifying neighboring node with lowest pressure value, sending traffic to neighboring node with lowest pressure value, and stopping if the neighboring node is a gateway node, otherwise identifying the node as a router node and returning to the step of finding neighboring nodes.

Inventors: 
Finkler, Todd B.; Shayman, Mark A.
Patent Number: 
US8443105
Technical domain: 
Communications
FIle Date: 
2011-12-12
Grant Date: 
2013-05-14
Grant time: 
519 days
Grant time percentile rank: 
9
Claim count percentile rank: 
2
Citations percentile rank: 
1
'Cited by' percentile rank: 
1
Assignee: 
US DIRECTOR NAT SECURITY AGENC

Device for impedance matching radio frequency open wire transmission lines

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NSA

An impedance matching device comprises a dielectric material having a ground plane affixed to one surface, a microstripline conductor disposed on an opposite surface, and a movable dielectric plate. The movable dielectric plate has a higher dielectric constant than the dielectric material, a user-selectable shape, and a conductive coating on the top surface. The bottom surface of the movable dielectric plate engages a portion of the microstripline conductor, and is movable transversely to the microstripline conductor to increase or decrease the impedance of the microstripline conductor and linearly to change the phase of the microstripline conductor.

Inventors: 
Rockenbauch, Craig A.
Patent Number: 
US7283015
Technical domain: 
Communications
FIle Date: 
2005-09-22
Grant Date: 
2007-10-16
Grant time: 
754 days
Grant time percentile rank: 
13
Claim count percentile rank: 
1
Citations percentile rank: 
1
'Cited by' percentile rank: 
1
Assignee: 
NATIONAL SECURITY AGENCY

Single frequency repeater

Patent image
NSA

A novel single frequency repeater is disclosed that eliminates the problems of feedback and concurrent oscillation. The single frequency repeater of the present invention comprises a backplane, a first antenna, a filter, an amplifier, a power supply, a switch, and a second antenna. The first antenna, filter, amplifier, power supply, and switch are mounted to one side of the backplane. Preferably, the backplane is electrically grounded. The second antenna is mounted on the second side of the backplane, in an orthogonal direction to the first antenna on the first side of the backplane. By placing the first antenna in the back lobe of the second antenna, separating the first antenna and the second antenna with the grounded backplane, and mounting the second antenna in an orthogonal orientation to the first antenna, problems with feedback and concurrent oscillation have been overcome.

Inventors: 
Schwartz, Hugh Warren
Patent Number: 
US7346311
Technical domain: 
Communications
FIle Date: 
2005-04-25
Grant Date: 
2008-03-18
Grant time: 
1,058 days
Grant time percentile rank: 
19
Claim count percentile rank: 
2
Citations percentile rank: 
1
'Cited by' percentile rank: 
1
Assignee: 
NATIONAL SECURITY AGENCY

Method of estimating a high frequency carrier signal

Patent image
NSA

A method of estimating the carrier frequency of a signal is disclosed. The method comprising the steps of initializing a time average vector to zero, selecting a user-selectable time segment to divide a received signal into. A signal is received, and divided into the user-selectable time segments. A spectral peak vector is calculated by performing a spectral estimation process on the user-selectable time segment divided signal. A first correlation vector is calculated on the spectral peak vector, and a second correlation vector is calculated from the spectral peak vector and the first correlation vector. The time average vector is appended with the result from the second correlation vector, and the process repeats for each time segment the received signal was broken into. The carrier is estimated using the most commonly occurring frequency in the time average vector.

Inventors: 
Nelson, Douglas J.
Patent Number: 
US7444128
Technical domain: 
Communications
FIle Date: 
2006-01-19
Grant Date: 
2008-10-28
Grant time: 
1,013 days
Grant time percentile rank: 
18
Claim count percentile rank: 
2
Citations percentile rank: 
1
'Cited by' percentile rank: 
1
Assignee: 
NATIONAL SECURITY AGENCY

Method of decoding signals having binary BCH codes

Patent image
NSA

A method of correcting a communication signal with BCH product codes is disclosed. The method comprising the steps of receiving a codeword vector, establishing a generator polynomial, establishing a check polynomial, calculating a binary-matrix, and calculating the binary syndrome S=Hrt. If an all zero vector results, no errors exist in the received vector. If errors exist, a tm x (N−k) binary matrix is created, the power basis expansion of (r(α1), r(α3), r(α5), . . . r(α2t−1)) is calculated, and the syndrome is solved. The speed of the method comes from using word-level XOR's to apply the check polynomial to the stream at all offsets. The utility of this approach is due in part to the fact that the conversion matrix involved can be created quickly using only items needed elsewhere in BCH decoders: a field table and the generator polynomial coefficients.

Inventors: 
Kline, Jason Michael; Newhart, Donald W.; Nirschl, Nicholas Paul
Patent Number: 
US7694207
Technical domain: 
Communications
FIle Date: 
2006-09-25
Grant Date: 
2010-04-06
Grant time: 
1,289 days
Grant time percentile rank: 
23
Claim count percentile rank: 
1
Citations percentile rank: 
1
'Cited by' percentile rank: 
1
Assignee: 
NATIONAL SECURITY AGENCY

Device for and method of wireless intrusion detection

Patent image
NSA

A device for and method of detecting intrusion into a wireless network that includes a configuration file, a rules files, a main processor, a set packet processor, an initialize preprocessor, a parse rules file, an interface thread unit, a process packet unit, a decoder, a preprocess unit connected to the process packet unit; at least one preprocessor consisting of a rogue access point and transmit channel preprocessor, a NETSTUMBLER preprocessor, a MAC spoofing preprocessor, a DEAUTH flood preprocessor, an AUTH flood preprocessor, a rogue client preprocessor, a bridged network preprocessor, a rogue client valid access point preprocessor, valid client rogue access point preprocessor, an ad-hoc network preprocessor, a wrong channel preprocessor, a cloaking policy violation preprocessor, an encryption policy violation preprocessor, and a null SSID association policy violation preprocessor; and a detector.

Inventors: 
Matlock, Kristen L.
Patent Number: 
US8069483
Technical domain: 
Communications
FIle Date: 
2006-10-19
Grant Date: 
2011-11-29
Grant time: 
1,867 days
Grant time percentile rank: 
34
Claim count percentile rank: 
6
Citations percentile rank: 
1
'Cited by' percentile rank: 
8
Assignee: 
NATIONAL SECURITY AGENCY

Synchronous fusion of video and numerical data

Patent image
NSWCCD

According to typical practice of the present invention, temporal identifiers are simultaneously associated with (i) video and (ii) numerical data while these data are contemporaneously collected by, respectively, (i) a video camera filming an event and (ii) a data acquisition system acquiring numerical data from sensor(s) obtaining sensory information relating to the event. Various modes of inventive practice provide for time codes and/or markers as the temporal identifiers. The video and the numerical data are each converted to a digital form that furthers their mutual compatibility, the video to a compressed/encoded video file, the numerical data to an Adobe XMP data file. The compressed/encoded video file and the XMP data file are merged whereby the temporal identifiers are aligned with each other. The merged video file has numerical data embedded therein and is displayable so that the video and the numerical data are synchronized in comportment with actual real-time occurrence.

Inventors: 
Congedo, Peter D.; Fry, David J.; Krishen, Calvin D.
Patent Number: 
US9025937
Technical domain: 
Communications
FIle Date: 
2012-10-26
Grant Date: 
2015-05-05
Grant time: 
921 days
Grant time percentile rank: 
16
Claim count percentile rank: 
6
Citations percentile rank: 
1
'Cited by' percentile rank: 
1
Assignee: 
US NAVY

Integrated capacitor and inductor

Patent image
NSWCCD

An integrated capacitor and inductor device for separate use as a capacitor and inductor. The device has a four-terminal arrangement having separate capacitor and inductor terminals, which allows connection as two independent circuit elements within one physical package. The device includes a hollow vessel having an exposed integrated capacitor element, in which the exposed integrated capacitor element comprises at least a portion of the hollow vessel. The device also includes a coil winding at least partially within the hollow vessel, electrically communicating with the integrated capacitor element. The integrated capacitor and inductor device may be configured in a plurality of shapes, using different materials to maximize the effects of electric and magnetic fields.

Inventors: 
Cho, Chahee P.; Lynch, William A.; Ly, Thong N.; Mcconnell, Richard A.
Patent Number: 
US7492240
Technical domain: 
Communications
FIle Date: 
2006-09-28
Grant Date: 
2009-02-17
Grant time: 
873 days
Grant time percentile rank: 
16
Claim count percentile rank: 
5
Citations percentile rank: 
1
'Cited by' percentile rank: 
1
Assignee: 
US NAVY

Hybrid digital-to-synchro converter unit

Patent image
NSWCCD

A digital-to-synchro converter (“DSC”) is a device that converts digital signals to analog signals suitable for use by a synchro device. A conventional DSC implements complex circuitry to take digital input and generate [V Sin({acute over (ω)}t) Sin(Φ)] and [V Sin({acute over (ω)}t) Cos(Φ)] analog signals, and a Scott-T transformer to transform these analog signals into [V Sin({acute over (ω)}t) Sin(Φ)], [V Sin({acute over (ω)}t) Sin(Φ+120)], and [V Sin({acute over (ω)}t) Sin(Φ+240)] analog signals. An inventive DSC, as typically embodied, implements a microcontroller to take digital input and generate [V Sin({acute over (ω)}t) Sin(Φ)] and [V Sin({acute over (ω)}t) Sin(Φ+120)] digital signals, a digital-to-analog converter to convert these digital signals to [V Sin({acute over (ω)}t) Sin(Φ)] and [V Sin({acute over (ω)}t) Sin(Φ+120)] analog signals, and a regular transformer (i.e., non-Scott-T transformer) to transform these analog signals (typically, in amplified voltage form) into [V Sin({acute over (ω)}t) Sin(Φ)], [V Sin({acute over (ω)}t) Sin(Φ+120)], and [V Sin({acute over (ω)}t) Sin(Φ+240)] analog signals. Inventive practice is accurate, versatile, and economical.

Inventors: 
Patel, Bhavesh V.
Patent Number: 
US8514111
Technical domain: 
Communications
FIle Date: 
2012-06-04
Grant Date: 
2013-08-20
Grant time: 
442 days
Grant time percentile rank: 
8
Claim count percentile rank: 
5
Citations percentile rank: 
2
'Cited by' percentile rank: 
1
Assignee: 
US NAVY

Longwave infrared imaging of a high-temperature, high-intensity light source

Patent image
NSWCCD

A neutral density (ND) filter made of an LWIR-transmissive, heat-resistant material is interposed between a longwave infrared (LWIR) imager and an entity that is highly emanative of both light and heat. According to exemplary inventive practice, the ND filter is a thermoplastic (e.g., polystyrene) sheet characterized by a thickness in the 1-2 mm range and a thermal conductivity≦0.13 W/m-K. Important parameters of the ND filter include LWIR transmittance (which depends on material and thickness) and thermal conductivity (which depends on material). The quality of the image taken of the entity is affected by the respective degrees of LWIR attenuation by, and heating up of, the ND filter. Accordingly, the material and the thickness of the ND filter are selected to optimize the image, in particular so as to avoid saturation and/or whiting-out of the image due to insufficient LWIR attenuation and/or excessive ND filter temperature.

Inventors: 
Sinfield, Matthew; Lueken, Dennis M.; Setlik, Brian J.
Patent Number: 
US9307156
Technical domain: 
Communications
FIle Date: 
2013-12-19
Grant Date: 
2016-04-05
Grant time: 
838 days
Grant time percentile rank: 
15
Claim count percentile rank: 
5
Citations percentile rank: 
1
'Cited by' percentile rank: 
1
Assignee: 
US NAVY

Active-avoidance-based routing in a wireless ad hoc network

Patent image
NSWCCD

Conventional multi-hop routing of ad hoc wireless networks involves considerations such as costs, connection quality, distances, and numbers of hops. A conventional wireless routing algorithm may fail when a destructive event takes place and is rapidly expanding in area, as the route discoveries may perpetually lag behind the rate of expansion of the destructive area. As typically embodied, the present invention's wireless routing algorithm detects a destructive event early, assumes rapid expansion of the destruction area, establishes “subnets” of nodes, and predetermines one or more routes that circumvent the rapidly expanding destruction area by exiting from and returning to the subnet in which the destructive event originates. Typical inventive practice avails itself of the architectural character of the physical setting for the wireless network, for instance by establishing subnets corresponding to compartments formed by wall-like structures (e.g., shipboard bulkheads), which represent natural barriers to expansion of a destruction area.

Inventors: 
Dong, Qing; Ortiz, Albert; Dalessandro, Donald D.; Kocsik, David J.
Patent Number: 
US8509060
Technical domain: 
Communications
FIle Date: 
2011-06-29
Grant Date: 
2013-08-13
Grant time: 
776 days
Grant time percentile rank: 
14
Claim count percentile rank: 
3
Citations percentile rank: 
2
'Cited by' percentile rank: 
1
Assignee: 
US NAVY

Quantum key distribution protocol process

Patent image
NSWCDD

A communication process is provided for sending a qubit message between Alice and Bob using a quantum channel for obviating a faked-state attack by Eve. The qubit message is composed of ensemble bits and transmitted as a plurality of photons into the quantum channel. Each photon has a corresponding bit value. The process includes: Alice preparing three uniformly random bit strings each of length 4N to produce strings R (raw key), P (bit basis) and U (unitary operation), and Bob preparing two uniformly random bit strings of the same length to produce strings M (bit basis) and V (unitary operation). Alice broadcasts P, applies her unitary operation and records a first weak measurement to the photons for transmission. Meanwhile Bob broadcasts M, applies his unitary operation and records both a second weak measurement and a strong measurement to the photons. Alice segregates her key and weak measurement strings to produce corresponding truncated strings from differing bases in P and M, and broadcasts the truncated key string. Bob segregates his weak and strong measurement strings from the differing bases to produce corresponding truncated strings, broadcasting the truncated strong measurement string. Bob then compares an average of his truncated weak measurement string to a security threshold as a first condition. Alice compares an average of her truncated weak measurement string to the security threshold as a second condition. If both conditions are satisfactory, Alice segregates a new truncated key string from R by selecting same bases in P and M for sending to Bob.

Inventors: 
Troupe, James E.
Patent Number: 
US9306739
Technical domain: 
Communications
FIle Date: 
2014-11-19
Grant Date: 
2016-04-05
Grant time: 
503 days
Grant time percentile rank: 
9
Claim count percentile rank: 
4
Citations percentile rank: 
1
'Cited by' percentile rank: 
1
Assignee: 
US NAVY

Discrete phased electromagnetic reflector based on two-state elements

Patent image
NSWCDD

An electromagnetic reflector for reflecting an electromagnetic signal is provided based on meta-surface phase control using photo-capacitive materials, varactors or other tuning means. The shape of the metamaterial unit cell enhances the resonance and phase shift. The reflector includes first and second cells having respective first and second phase states, along with a switch for selecting between the first and second cells.

Inventors: 
Feng, Simin; Boulais, Kevin A.; Wallace, Frank L.; Corbett, Blaise L.; Gehman Jr., Victor H.
Patent Number: 
US9515390
Technical domain: 
Communications
FIle Date: 
2015-06-11
Grant Date: 
2016-12-06
Grant time: 
544 days
Grant time percentile rank: 
9
Claim count percentile rank: 
1
Citations percentile rank: 
1
'Cited by' percentile rank: 
1
Assignee: 
US NAVY