GPS spoofer and repeater mitigation system using digital...

Details GPS spoofer and repeater mitigation system using digital... GPS spoofer and repeater mitigation system using digital...

2007-07-31

2007-07-31

Tarcza, Thomas H. (Department: 3662)

Communications: directive radio wave systems and devices (e.g.,

Directive

Including a satellite

C342S357490

Reexamination Certificate

active

11405080

ABSTRACT:
A system and method using a multi-element digital beamformer for detection and mitigation of spoofer and repeater threats to GPS that would not be addressed by baseline signal-to-noise (SNR) maximization algorithms is disclosed. GPS correlators and processing are applied to multiple beam outputs to detect and locate spoofer and repeater threats. In the beamformer processing, detected threats can be spatially nulled, even in the presence of traditional high power jamming, by modifying the normal sample covariance matrix to introduce synthetic nulls. A digital complex weighting system multiples each input channel by a complex (gain/phase) weight and adds the weighted channels together to form beams that the GPS receiver can use to reacquire the satellites in use without knowledge of platform attitude or the antenna manifold.

REFERENCES:
patent: 5557284 (1996-09-01), Hartman
patent: 5952968 (1999-09-01), McDowell
patent: 5990831 (1999-11-01), McDowell
patent: 6421000 (2002-07-01), McDowell
patent: 6933885 (2005-08-01), Stockmaster

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