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System and method for detecting a weak signal in a noisy environment

Patent image
ARL

Systems and methods are disclosed for computing a power spectral density of a signal. One such method computes a Fast Fourier Transform (FFT) of a first signal segment and an FFT of a second signal segment. The first and second segments are adjacent and non-overlapping in time, and the second segment follows the first. The first FFT is multiplied by a complex conjugate of the second FFT. A first complex value is computed from this first product. An FFT of a third signal segment is computed. The second and third segments are adjacent and non-overlapping in time. The third segment follows the second segment. The second FFT is multiplied by a complex conjugate of the third FFT. A second complex value is computed from this second product. The first and second complex values are added, and the power spectral density of the sum is computed.

Inventors: 
Ly, Canh; Burke, Edward W.; Wellman, Ronald J.
Patent Number: 
Technical domain: 
Sensors and Measurement
FIle Date: 
2007-06-26
Grant Date: 
2012-11-27
Grant time: 
1,981 days
Grant time percentile rank: 
36
Claim count percentile rank: 
2
Citations percentile rank: 
1
'Cited by' percentile rank: 
1
Assignee: 
US ARMY