A Flexible Replay Delay Control Method for GNSS Direct Meaconing Signal

Shunshun Shang, Hong Li, Yimin Wei, Mingquan Lu

Peer Reviewed

Abstract:	In this paper, we introduce a flexible delay control method for the GNSS direct meaconing signal. Since GNSS has been playing an important role in human life, we need to pay attention to its security issues, especially spoofing attacks. In order to explore the corresponding anti-spoofing techniques, we should know more about spoofing methods so that we can study the characteristics of spoofing signals. As far as an encrypted GNSS signal is concerned, only the direct meaconer can generate the corresponding spoofing signal. In detail, the meaconer receives authentic signals from different directions and delays them with different delays, respectively. However, the delay control method has not yet been public, which restricts researchers to explore more efficient anti-spoofing methods. To this end, we introduce a flexible delay control method for meaconer based on the integer and fractional delay filters. In detail, the integer filter can delay the signal with an integer delay that is an integer multiple of sampling period, and the fractional filter can delay the signal by a fraction delay. We implement the fractional filter using the Farrow structure so that we only need to adjust one parameter in the filter if the replay delay changes. As a consequence, the delay control method is flexible and easy to implement on a hardware platform. We verify the introduced method by carrying out meaconing attacks against both the GNSS-SDR receiver and the GPS hardware receiver of our lab.
Published in:	Proceedings of the 2020 International Technical Meeting of The Institute of Navigation January 21 - 24, 2020 Hyatt Regency Mission Bay San Diego, California
Pages:	992 - 1000
Cite this article:	Shang, Shunshun, Li, Hong, Wei, Yimin, Lu, Mingquan, "A Flexible Replay Delay Control Method for GNSS Direct Meaconing Signal," Proceedings of the 2020 International Technical Meeting of The Institute of Navigation, San Diego, California, January 2020, pp. 992-1000. https://doi.org/10.33012/2020.17192
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