Sequential Interference Nulling and Localization in Two-Dimensional GPS Receiver Array

Moeness G. Amin

Abstract:	Global Positioning System (GPS) receivers are subject to jamming, which can compromise the performance of the GPS receiver and disallow the receiver to acquire or track the GPS signals. Jammer nulling and localization is an important task in airborne or ground based GPS receivers. It is often two separate processes, both act on the sampled data for covariance matrix estimation or perform recursive minimization of an error cost function. In this paper, a sequential nulling and localization process is proposed. The direction of arrivals (DOAs) of the jammers are obtained from the adaptive nulling weights, rather than the nulling array pattern, using high resolution direction finding. Interference mitigation is performed for each satellite independently using an adaptive spatial weight vector whose length is equal to the number of antennas. At convergence, the weight vectors contain the interference bearing information, which can be extracted using subspace processing. We consider two dimensional steering dual polarized arrays. Examples are provided to illustrate performance in various jamming and noise environments.
Published in:	Proceedings of the 20th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2007) September 25 - 28, 2007 Fort Worth Convention Center Fort Worth, TX
Pages:	1257 - 1264
Cite this article:	Amin, Moeness G., "Sequential Interference Nulling and Localization in Two-Dimensional GPS Receiver Array," Proceedings of the 20th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2007), Fort Worth, TX, September 2007, pp. 1257-1264.
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