The CE-GPS RGIC Experiment: Theoretical and First Practical Results

Dominique Berges, Jean-Lue Issler, Jean-Paul Lefevre, Norbert Suard, Marie-Christine Flipo

Abstract:	CNES is involved in a GPS geostationary overlay experimentation. The purpose is to test different new techniques in order to select optimal station synchronisation method, as well as the geostationary spacecraft orbitography method. These new techniques are necessary for the Ranging GPS Integrity Channel (RGIC). The experimentation implemented by CNES includes three transmitting/receiving earth stations (manufactured by IN-SNEC and called STRATEGIC stations) and one Inmarsat 2 C/L band transponder. GPS integrity and WADGPS missions require very precise synchronisation between the different stations, but also between the time broadcast by the geostationary overlay and that by the GPS satellites. The experimentation requires software modifications of the NR 106 GPS receivers (manufactured by SERCEL) which are used for the Inmarsat 2 and GPS signals simultaneous acquisition. These modifications are presented here. Theoretical study and experimental results, concerning the C/A codes interference and the jamming influence, are presented in this paper. The C/A codes synchronisation, in the geostationary repeater, is recommended to improve the range and two way time transfer performances. Preliminary results show the successful convergence of the servo-loop and pseudorange measurements of the geostationary and GPS satellites are compared. The code/carrier coherency of the received RGIC signals is as good as that of GPS.
Published in:	Proceedings of the 6th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1993) September 22 - 24, 1993 Salt Palace Convention Center Salt Lake City, UT
Pages:	399 - 408
Cite this article:	Berges, Dominique, Issler, Jean-Lue, Lefevre, Jean-Paul, Suard, Norbert, Flipo, Marie-Christine, "The CE-GPS RGIC Experiment: Theoretical and First Practical Results," Proceedings of the 6th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1993), Salt Lake City, UT, September 1993, pp. 399-408.
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