Measurement of the RGIC Signal Code/Carrier Coherency with a GPS Receiver

Jean-Luc Issler and Jean-Paul Lefevre

Abstract:	The CNES is preparing an experimentation using a geostationary satellite with an global coverage (European Complement to GPS experimentation). This experimentation is dedicated to the Ranging GPS Integrity Channel (RGIC) concept technical validation. The RGIC is based on a geostationq Ll band repeater, transmitting GPS like signals to users. The RGIC data contain updated integrity informations concerning the GPS constellation. They contain also a navigation message linked to the geostationary satellite. This system is conceivable with a servo-loop, making the repated Ll carrier coherent with the repeated CIA code. This coherency between code and carrier permits all GPS receivers to make good measurements permanently with a signal issued from a geostationary repeater. In this context, CNES performed a preliminary experiment, in order to determine the non-coherency domain acceptable by the GPS receivers planned for the expelimentatiM. The czodeitier cderency is characterixed by its slipping value, in Hz or in m/s. Different GPS-like signals with different slipping values have been injected in GPS receivers. The code and phase measurements obtained have been compared with results provided by a reference GPS receiver. The results show that GPS receivers can easily be used as code/carrier slipping sensors, which can be used in the RGIC servo-loops of the CNES experimentation. The hardware specifically designed for the CNES experimentation will be carried out by IN-SNEC ( earth stations hardware and software ) and SERCEL ( modified GPS receivers ).
Published in:	Proceedings of the 5th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1992) September 16 - 18, 1992 Albuquerque, NM
Pages:	985 - 991
Cite this article:	Issler, Jean-Luc, Lefevre, Jean-Paul, "Measurement of the RGIC Signal Code/Carrier Coherency with a GPS Receiver," Proceedings of the 5th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1992), Albuquerque, NM, September 1992, pp. 985-991.
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