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Method of estimating digital signal frequency

Patent image
NSA

The present invention is a novel method of performing spectral analysis on a digital signal. The received signal is segmented into a number of data blocks, which may be disjoint or overlapping. For each data block, the signal is differentiated, and the Gram-Schmidt process is used to obtain orthogonality between a signal and its derivative. The complex extension leads to computation of phase using either the inverse tangent function or the complex logarithm. Finally, frequency estimation follows through differentiation of the unwrapped phase.

Inventors: 
Cusmariu, Adolf
Patent Number: 
Technical domain: 
Sensors and Measurement
FIle Date: 
2007-09-27
Grant Date: 
2010-05-11
Grant time: 
957 days
Grant time percentile rank: 
17
Claim count percentile rank: 
4
Citations percentile rank: 
1
'Cited by' percentile rank: 
1
Assignee: 
NATIONAL SECURITY AGENCY