GPS/GALILEO Radio Frequency Compatibility Analysis

Jeremie Godet

Abstract:	This paper gives first results and conclusions as far as GPS / GALILEO radio frequency compatibility is concerned. However, this study should be considered as a theoretical exercise since it does not take into account all implications at system level (service associated to the signals, access deny issues, …) but only focuses on interference computa- tion. In this respect, several study cases are considered for GALILEO narrow band (NB) signals and wide band (WB) signals taking into account the possibility to share GPS bands or to use independent frequency bands. SNR degradation of modernized GPS signals is computed. This degradation is due to the adjunction of GALILEO constellation emitting signals at different central frequen- cies, ∆f, from GPS bands : GPS L bands sharing case (∆f=0, 1.023 and 2.046 MHz) and GALILEO bands E1&E2 (∆f=14.322 MHz). Both GPS intra-system inter- ference and GALILEO inter-system interference are com- puted through simulations modeling the two constellations and taking also into account receiver antenna pattern. The SNR degradation computation methodology is based on the use of interference coefficients that are calculated for each combination of signals. Continuous spectrum as- sumptions is used and applicability of the results is dis- cussed. Eventually, first conclusions as far as feasibility of frequency bands sharing for two radio navigation satellite systems are presented.
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:	1782 - 1790
Cite this article:	Godet, Jeremie, "GPS/GALILEO Radio Frequency Compatibility Analysis," 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. 1782-1790.
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