The Method of Receiver-Spoofer Signal Mitigation Based on Multi-correlator

Zhou Meng, Ma Tianyi, Li Hong, Lu Mingquan, Zhu Hongyu

Abstract: Receiver-Spoofer (RS) is a means of Global Navigation Satellite System (GNSS) spoofing that is the least likely to be found at present. It can accomplish the spoofing process without interrupting the receiver tracking state. The required spoofing signal ratio is very low, so it is difficult to be detected in terms of the anomaly power detection and other traditional anti-spoofing methods. However, the RS will cause distortion of the code loop after entering the receiver. By using this feature, the trace detection method based on Ratio Metric can effectively detect the RS, but may mistake the multipath signal for RS signal. RS detection method based on multi-correlator can effectively reduce the false alarm probability of Ratio Metric by adding a pair of correlators in the loop. Although this optimized method can give an alarm when RS works, the receiver code loop will still be captured by spoofing signal, so that the pseudo range from the spoofed channel cannot be used in the positioning calculation. To mitigate the impact of spoofing signal on the receiver code loop, in this work, a multi-correlator based RS signal mitigation method is proposed. Specifically, in terms of the additional observations provided by the extra correlator in the aforementioned spoofing detection method. By using the increment of observed amount, the error of the phase discriminator (caused by the spoofing signal) can be calculated. Using this error as the correction of the phase discriminator equation, the receiver code loop will be locked on the authentic signal and will not be affected by the spoofing signal. Finally, the validation of RS signal mitigation method based on multi-correlator is verified via a series of simulation experiments.
Published in: Proceedings of the ION 2017 Pacific PNT Meeting
May 1 - 4, 2017
Marriott Waikiki Beach Resort & Spa
Honolulu, Hawaii
Pages: 842 - 850
Cite this article: Meng, Zhou, Tianyi, Ma, Hong, Li, Mingquan, Lu, Hongyu, Zhu, "The Method of Receiver-Spoofer Signal Mitigation Based on Multi-correlator," Proceedings of the ION 2017 Pacific PNT Meeting, Honolulu, Hawaii, May 2017, pp. 842-850. https://doi.org/10.33012/2017.15108
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