A threat to GNSS receivers is posed by a spoofing transmitter that emulates authentic signals but with randomized code phase and\r\nDoppler values over a small range. Such spoofing signals can result in large navigational solution errors that are passed onto the\r\nunsuspecting user with potentially dire consequences. An effective spoofing detection technique is developed in this paper, based\r\non signal power measurements and that can be readily applied to present consumer grade GNSS receivers with minimal firmware\r\nchanges. An extensive statistical analysis is carried out based on formulating a multihypothesis detection problem. Expressions\r\nare developed to devise a set of thresholds required for signal detection and identification. The detection processing methods\r\ndeveloped are further manipulated to exploit incidental antenna motion arising from user interaction with a GNSS handheld\r\nreceiver to further enhance the detection performance of the proposed algorithm. The statistical analysis supports the effectiveness\r\nof the proposed spoofing detection technique under various multipath conditions
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