Weak GPS Interference Direction of Arrival Estimation Using GPS Signal Cancellation

Zili Xu and Matthew Trinkle

Abstract:	Due to the low transmission power, GPS signal is vulnerable to both intentional and unintentional interferences. The need to localize GPS interference sources is becoming more pressing as more systems begin to rely on GPS. In this paper, the direction of arrival of weak GPS interference, which has the same power level as the GPS signals or is even weaker than them, is intended to be estimated using an antenna array. To achieve this, GPS signals which become the strong interferences of the bearing estimation are cancelled by the FIR Wiener filter, the mutual coupling between the antennas and channel gain/phase errors in the antenna array are estimated by the antenna array calibration techniques, and the non-uniformly distributed coloured noise is mitigated by the covariance matrix subtraction. This paper first proposes the FIR Wiener filter based GPS signal cancellation method. The array signal model, the antenna array calibration technique and the non-uniformly distributed coloured noise mitigation method are described later. At last, the performance of the GPS interference direction of arrival estimation is analyzed in the experiment.
Published in:	Proceedings of the 25th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2012) September 17 - 21, 2012 Nashville Convention Center, Nashville, Tennessee Nashville, TN
Pages:	2940 - 2945
Cite this article:	Xu, Zili, Trinkle, Matthew, "Weak GPS Interference Direction of Arrival Estimation Using GPS Signal Cancellation," Proceedings of the 25th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2012), Nashville, TN, September 2012, pp. 2940-2945.
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