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Method for evaluating similarity of signals having a carrier frequency offset

  • US 5,363,103 A
  • Filed: 07/06/1993
  • Issued: 11/08/1994
  • Est. Priority Date: 01/05/1993
  • Status: Expired due to Term
First Claim
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1. An apparatus for evaluating the similarity of multi-mode radar signals detected by a passive receiver said apparatus comprising a means to determine the differential phase of pairs of received signals, one signal of each pair being a currently received signal and the other a previously received signal, and means for fitting a straight line to the differential phase of pairs of signals wherein the slope of the line gives the frequency offset between signals and the mean square error between the actual phase-time data and the straight lines indicates the similarity of the signals.

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