Modeling Maximum Aggregate GPS Signal Power Levels for GPS Self-Interference Analyses

Rick Owen, David B. Goldstein, and Christopher Hegarty

Abstract:	This paper presents a model for computing maximum aggregate GPS signal power levels for use in selfinterference analyses. Geometry dependent and time varying terms such as user and satellite antenna gain patterns and space loss are included in this model for the computation of power from all satellites in-view. Worstcase interfering power is determined over a grid of user locations on the earth’s surface and at specified time intervals. Results are presented for several GPS constellation configurations, receiver antenna types and GPS spacecraft types. As an example, the worst-case aggregate power is computed for the proposed earthcoverage M-code signal. The inclusion of user and spacecraft antenna gain patterns provides more realistic estimates of aggregate received power than the typical approach of using a fixed maximum signal power level and maximum user antenna gain for the interfering signals while assuming a fixed minimum signal power and minimum user antenna gain for the desired signal.
Published in:	Proceedings of the 2002 National Technical Meeting of The Institute of Navigation January 28 - 30, 2002 The Catamaran Resort Hotel San Diego, CA
Pages:	939 - 947
Cite this article:	Owen, Rick, Goldstein, David B., Hegarty, Christopher, "Modeling Maximum Aggregate GPS Signal Power Levels for GPS Self-Interference Analyses," Proceedings of the 2002 National Technical Meeting of The Institute of Navigation, San Diego, CA, January 2002, pp. 939-947.
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