GPS Anti-Jam for CAT II Landing Applications

Kenneth Falcone, Naresh Babu Jarmale, Frank Allen and John Clark

Abstract:	The Navy JPALS (Joint Precision Approach and Landing System) Architecture Requirements and Definition (ARD) Program objective is to develop a Local Area Differential GPS (LDGPS) based ship landing system architecture that supports CAT II landing applications in a GPS jamming environment. The aim of this work is to develop GPS Anti-Jam Technology ensuring the quality of GPS carrier phase measurements necessary to meet shipboard CAT II landing requirements in a jamming environment. The technical issues involved are the ship’s severe RF environment (EMI), the higher jamming vulnerability of carrier phase tracking, and the impact of jamming mitigation on the availability, integrity, and accuracy of GPS carrier phase measurements. The goals are to provide an additional up to 40 dB of anti-jam margin on carrier phase tracking against multiple jammers. The results presented include software simulations using the Mayflower Simulation Toolkit, along with hardware measurements using COTS products: the Mayflower GPS Receiver (RGR-6000), the Mayflower GPS Interference Canceller (AIC-2000), and the CAST GPS Signal Generator (CCSG). Simulation results show that Adaptive Temporal Filter (ATF) and Adaptive Spatial Filter (ASF) GPS anti-jam techniques provide the required anti-jam margin on carrier phase tracking. Laboratory results show that Mayflower ATF technology, embedded in the AIC- 2000, does not significantly affect GPS carrier phase measurement accuracy. Post processing of the carrier phase measurements with Mayflower relative navigation filter software indicated submeter (cm-level) relative navigation accuracy which meets the shipboard autolanding accuracy requirements with a significant margin.
Published in:	Proceedings of the 13th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 2000) September 19 - 22, 2000 Salt Palace Convention Center Salt Lake City, UT
Pages:	1301 - 1308
Cite this article:	Falcone, Kenneth, Jarmale, Naresh Babu, Allen, Frank, Clark, John, "GPS Anti-Jam for CAT II Landing Applications," Proceedings of the 13th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 2000), Salt Lake City, UT, September 2000, pp. 1301-1308.
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