Real-Time Spoofing Detection in a Narrow-Band Civil GPS Receiver

B.W. O'Hanlon, M.L. Psiaki, T.E. Humphreys, J.A. Bhatti

Abstract:	A real-time method for detecting GPS spoofing in a narrowbandwidth civilian GPS receiver has been implemented and tested, both in the absence of and in the presence of spoofing. The system was implemented as a software-defined radio system on a personal computer, using a pair of narrowbandwidth radio front-ends that were geographically separated, with data transmitted between the two over the Internet. The presence of a spoofing signal is determined by mixing and accumulating the base-band quadrature channel samples from the two receivers, with the aim of cross-correlating the P(Y) code that should be present in both signals in the absence of spoofing. Cross-correlation of spurious signals and undesired autocorrelation of C/A codes precluded the reliable detection of a spoofing signal in the real-time system, though further post-processing in MATLAB resolved these issues.
Published in:	Proceedings of the 23rd International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2010) September 21 - 24, 2010 Oregon Convention Center, Portland, Oregon Portland, OR
Pages:	2211 - 2220
Cite this article:	O'Hanlon, B.W., Psiaki, M.L., Humphreys, T.E., Bhatti, J.A., "Real-Time Spoofing Detection in a Narrow-Band Civil GPS Receiver," Proceedings of the 23rd International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2010), Portland, OR, September 2010, pp. 2211-2220.
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