Jam Resistant GPS Reception

A unique approach is proposed for the effective rejection of cochannel, but otherwise arbitrary, jamming and other interference in GPS reception. The approach is based on a method of processing a multiplicity of signals sharing the same time-frequency and polarization space, in such a way as to favor a bona fide GPS signal over the others present (jamming, spoofing, multipath, atmospherics or other cochannel signals/noise.)A Phase I effort/program is proposed herein to investigate analytically, with the aid of computer simulations, the effects on wideband signals of the unique signal processing operations performed in the proposed approach. Wideband signals represent sentative of those received from GPS satellites will be the focus of the proposed investigations to determine quantitatively how their code waveforms. The necessity for compensatory measures, and how best to implement such, to be undertaken in the receiver front end to counter likely distortions of the GPS signal, will also be determined. A program will be evolved for validating and demonstrating experimentally the results of Phase I analyses in a follow-on Phase II effort, by means of actual GPS satellite signals derived in the laboratory either as generated internally to a Miniature Airborne GPS Receiver (MAGR); or by actual reception from GPS satellites, with retrofits to a MAGR using adaptations of hardware designs already successfully proven to function as required, plus other circuits or software to be defined in Phase I. Anticipated benefits, both military and commercial, center on the absolute necessity of totally immunizing GPS receivers against cochannel interference/jamming/spoofing, in all situations of GPS-aided navigation and/or rescue location.