Spoofing Detection and Mitigation in a Multi-correlator GPS Receiver Based on the Maximum Likelihood Principle

Spoofing Detection and Mitigation in a Multi-correlator GPS Receiver Based on the Maximum Likelihood Principle

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As a structural interference, spoofing is difficult to detect by the target receiver while the advent of a repeater makes the implementation of spoofing much easier.Most existing anti-spoofing methods are merely capable of detecting the spoofing, i.e.

, they cannot effectively remove copyright signals.Therefore, based on the similarities between multipath and spoofing, the feasibility of applying multipath mitigation methods Display Figure to anti-spoofing is first analyzed in this paper.We then propose a novel algorithm based on maximum likelihood (ML) estimation to resolve this problem.

The tracking channels with multi-correlators are constructed and a set of corresponding steps of detecting and removing the 7 Piece Queen Bedroom copyright signals is designed to ensure that the receiver locks the authentic signals in the presence of spoofing.Finally, the spoofing is successfully executed with a software receiver and the saved intermediate frequency (IF) signals, on this basis, the effectiveness of the proposed algorithm is verified by experiments.