An Investigation of the Adaptive Spatial Temporal Selective Attenuator

William R. Michalson and Ilir F. Progri

Abstract:	The vulnerability of the GPS signal against any kind of interference is known. Any interference signal near the band of the GPS signal can saturate the GPS receiver and at the same time can deteriorate the autocorrelation properties of the GPS signal and its PRN code, which results in loss of lock of the GPS signal. An adaptive spatial temporal selective attenuator (ASTSA) can be successfully utilized to mitigate the undesired effects of wideband/narrowband interference sources. The analytical development of this investigation exploits the fundamental issues regarding a new adaptive methodology, the impact of the array elements, and the number of temporal shifter delays for a given desired signal frequency on the ASTSA performance against one broad band jammer (BBJ) and one continuous wave jammer (CWJ). The new adaptive methodology exploits the crosscorrelation properties between a locally generated signal and the received signal. The old adaptive technique utilizes a pointing (or steering, or signature) vector to compute the desired set of multipliers, which act as terms of a finite impulse response digital filter. The new adaptive methodology allows restoring the phase of the signal coming out of the ASTSA. Results from several simulation experiments are presented to assess the performance of the old and new adaptive techniques. We suspect that this investigation could be particularly valuable for the implementation of ASTSAs or analogous systems that will operate on the L5 frequency as well as for ASTSAs which are undergoing implementation for either the L1 or L2 frequency.
Published in:	Proceedings of the 14th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 2001) September 11 - 14, 2001 Salt Palace Convention Center Salt Lake City, UT
Pages:	1985 - 2021
Cite this article:	Michalson, William R., Progri, Ilir F., "An Investigation of the Adaptive Spatial Temporal Selective Attenuator," Proceedings of the 14th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 2001), Salt Lake City, UT, September 2001, pp. 1985-2021.
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