Communications: directive radio wave systems and devices (e.g. – Directive – Including a satellite
Patent
1995-02-03
1996-09-17
Tarcza, Thomas H.
Communications: directive radio wave systems and devices (e.g.,
Directive
Including a satellite
342352, G01S 502
Patent
active
055572847
ABSTRACT:
A pair of antennae in combination with a GPS signal receiver system is employed for detecting the reception of satellite information signals from a spoofing signal transmitter as opposed to those satellite information signals transmitted aboard each of the satellite vehicles which form a satellite positioning system. As described herein, an indication of the pointing angle between the antennae and the actual transmitter transmitting the satellite information signals is detected. The pointing angle and/or alternatively the range difference may be observed by monitoring the behavior of the pseudo random code associated with the carrier of the satellite information signal, or the carrier itself. In turn, pseudo range measurements, pseudo range rate measurements, carrier phase measurements, and or Doppler count measurement associated with the two antennae may be use to obtain the desired discriminant.
REFERENCES:
patent: 4754283 (1988-06-01), Fowler
patent: 4894655 (1990-01-01), Joquet et al.
patent: 5119102 (1992-06-01), Barnard
patent: 5311194 (1994-05-01), Brown
patent: 5311197 (1994-05-01), Sorden et al.
patent: 5379045 (1995-01-01), Gilbert et al.
Honeywell Inc.
Phan Dao L.
Tarcza Thomas H.
Ungemach Charles J.
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