Evaluation of GPS Anti-Jam System Effects on Pseudorange and Carrier Phase Measurements for Precision Approach and Landing

Gary A. McGraw, S.Y. Ryan Young, Kristen Reichenauer

Abstract:	A key challenge for the Joint Precision Approach and Landing System (JPALS) is achieving required accuracy and integrity in the presence of jamming and with ground station installations in poor multipath conditions. Prior work by the authors demonstrated that a JPALS architecture based on Digital Beam Forming (DBF) with controlled reception pattern antennas (CRPAs) in conjunction with Dual-Frequency Smoothing (DFS) differential GPS (DGPS) could yield significant reductions in code multipath errors. In this paper we introduce additional complexities, namely errors in the knowledge of the CRPA gain/phase response and jamming. We show that errors in the knowledge of the CRPA response can lead to carrier phase errors large enough to affect JPALS performance in some instances. While CRPA/DBF processing provides substantial anti-jam capability, our simulations show that the relative geometry between the satellite, jammer(s), and multipath source(s) can have a significant effect on the ability of the CRPA/DBF system to mitigate multipath.
Published in:	Proceedings of the 17th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2004) September 21 - 24, 2004 Long Beach Convention Center Long Beach, CA
Pages:	2742 - 2751
Cite this article:	McGraw, Gary A., Young, S.Y. Ryan, Reichenauer, Kristen, "Evaluation of GPS Anti-Jam System Effects on Pseudorange and Carrier Phase Measurements for Precision Approach and Landing," Proceedings of the 17th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2004), Long Beach, CA, September 2004, pp. 2742-2751.
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