Characterization of Multipath on Land and Sea at GPS Frequencies

Jean-Claude Auber, Alain Bibaut, Jean-Marie Rigal

Abstract:	DASSAULT ELECTRONIQUE acquired a ve- hicle tracking system based on GPS and installed it at the French Ranges. This system is supposed to give the French Ranges the vehicle location in real time for safety range purposes. Unfortunately, when the aircraft flies at low altitude and rolls, the solution is dis- turbed by multipath, especially above the sea and a RAIM* algorithm becomes inefficient because of too few visible satellites and/or too many distur- bed measurements. DASSAULT ELECTRONIQUE conducted a study on multipath in order to describe it analyti- cally for the typical French Ranges environment. Simulation of multipath effects on a wide range of missions with help assess system accuracy at low altitude and it will identify limitations from an operational point of view. This article describes our results obtained from high rate signals before correlation and tracking loops. The data were collected in a flight pattern that allowed us to separate the direct from the re- flected GPS signal.
Published in:	Proceedings of the 7th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1994) September 20 - 23, 1994 Salt Palace Convention Center Salt Lake City, UT
Pages:	1155 - 1171
Cite this article:	Auber, Jean-Claude, Bibaut, Alain, Rigal, Jean-Marie, "Characterization of Multipath on Land and Sea at GPS Frequencies," Proceedings of the 7th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1994), Salt Lake City, UT, September 1994, pp. 1155-1171.
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