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Passive three dimensional track of non-cooperative targets through opportunistic use of global positioning system (GPS) and GLONASS signals

  • US 6,232,922 B1
  • Filed: 05/12/1999
  • Issued: 05/15/2001
  • Est. Priority Date: 05/12/1998
  • Status: Active Grant
First Claim
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1. A method for utilizing RF location signals broadcast over a wide area by at least one remote transmitter, with a receiver of said RF location signals disposed for discriminating between direct path said RF location signals and reflected said RF location signals in order to develop data relating to at least one reflective source of said reflected RF location signals, said method comprising the steps of:

  • a) receiving said RF location signals from said remote transmitter, b) extracting from said RF location signals direct range data representative of a direct RF signal path between said remote transmitter and said receiver, c) from said RF location signals, developing target range data representative of an RF signal path from said remote transmitter to said reflective source and then to said receiver, d) comparing said direct range data and said target data to develop relational data indicative of at least one selected relationship between said receiver and said reflective source.

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