초록 ▼

A method and apparatus for utilization of GPS, GLONASS or other existing RF signals is disclosed. These existing RF signals are scattered by targets, with a receiver of these scattered signals providing processing to extract three dimensional track of these objects. Angle-of-Arrival (AOA) informatio

A method and apparatus for utilization of GPS, GLONASS or other existing RF signals is disclosed. These existing RF signals are scattered by targets, with a receiver of these scattered signals providing processing to extract three dimensional track of these objects. Angle-of-Arrival (AOA) information of a received signal may be used, but is not required. Modifications of standard GPS signal processing allows observables such as range-sum, range-difference, and bistatic Doppler frequency to be observed. These observables, when coupled with standard bistatic/multistatic location equations, provide unambiguous and even redundant information on target coordinates. The method/device employs a modified code (range)/carrier(Doppler) search routine for initial target search/acquisition, wherein a direct path signal is used as a reference from which chip delay and Doppler shift excursions are examined. In this manner, the range and Doppler components observed will correspond to [range-sum-direct path] range, and true bistatic target Doppler irrespective of the satellite or receiver induced Doppler shifts.

대표청구항 ▼

[ Having thus described my invention and the manner of its use, it should be apparent that incidental changes may be made thereto that fairly fall within the scope of the following appended claims, wherein I claim:] [1.]1. A method for utilizing RF location signals broadcast over a wide area by at l

[ Having thus described my invention and the manner of its use, it should be apparent that incidental changes may be made thereto that fairly fall within the scope of the following appended claims, wherein I claim:] [1.]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.