GPS Multipath Mitigation Assessment of Digital Beam Forming Antenna Technology in a JPALS Dual Frequency Smoothing Architecture

Gary A. McGraw, Ryan S.Y. Young, Kristen Reichenauer, Jeff Stevens, and Fred Ventrone

Abstract:	The Joint Precision Approach and Landing System (JPALS) is the U.S. Department of Defense’s next generation landing system. A key challenge for the JPALS is achieving required accuracy and integrity in the presence of jamming and with ground station installations in poor multipath conditions. In this paper we consider two potential JPALS multipath mitigation technologies: Dual- Frequency Smoothing (DFS) differential GPS (DGPS) and digital beam-forming (DBF) with controlled reception pattern antennas (CRPAs). To perform a controlled assessment of different antenna and signal processing alternatives, we used a simulated diffuse ground multipath model along with a detailed anti-jam receiver signal processing model. The simulated code and carrier multipath errors were used to generate elevation angledependent statistical models that we used for comparative availability assessments. The combination of DBF and DFS algorithms yields substantial improvement in ground multipath errors compared to fixed-gain antennas, with a corresponding improvement in overall system availability.
Published in:	Proceedings of the 2004 National Technical Meeting of The Institute of Navigation January 26 - 28, 2004 The Catamaran Resort Hotel San Diego, CA
Pages:	561 - 572
Cite this article:	McGraw, Gary A., Young, Ryan S.Y., Reichenauer, Kristen, Stevens, Jeff, Ventrone, Fred, "GPS Multipath Mitigation Assessment of Digital Beam Forming Antenna Technology in a JPALS Dual Frequency Smoothing Architecture," Proceedings of the 2004 National Technical Meeting of The Institute of Navigation, San Diego, CA, January 2004, pp. 561-572.
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