Compatibility of the New Military GPS Signals with Non-Aviation Receivers

Young C. Lee

Abstract:	The United States Department of Defense (DoD) plans to add new military signals on the Global Positioning System (GPS) beginning with the Block IIR-M satellites on GPS L1 and L2 frequencies. Initially they plan to broadcast the primary components, M-code signals, approximately at the same power level as the L1 C/A- code signal, but in the future broadcast M-code signals 100 times stronger using spot beams. In adding the new military signals, DoD has recognized backwards compatibility as a requirement for GPS modernization. Compatibility of the new military signals with aviation receivers was investigated previously. The current paper investigates their compatibility with non-aviation receivers. Sophisticated correlation techniques for maximum multipath mitigation designed into non- aviation receivers by various manufacturers are identified. The effectiveness of each of these techniques in multipath mitigation is analyzed. Degradation of effective signal- to-noise power density ratio due to military signals (M- code, IM-code, P(Y)-code) is analyzed for each of the correlation techniques identified. This degradation analysis is used to determine whether the new military signals are compatible with non-aviation receivers.
Published in:	Proceedings of the 58th Annual Meeting of The Institute of Navigation and CIGTF 21st Guidance Test Symposium (2002) June 24 - 26, 2002 Hyatt Regency Hotel Albuquerque, NM
Pages:	581 - 597
Cite this article:	Lee, Young C., "Compatibility of the New Military GPS Signals with Non-Aviation Receivers," Proceedings of the 58th Annual Meeting of The Institute of Navigation and CIGTF 21st Guidance Test Symposium (2002), Albuquerque, NM, June 2002, pp. 581-597.
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