Integrity Monitoring Tests Conducted on GPS/GLONASS

P. Raby, P. Daly and S. Riley

Abstract:	Both Navstar GPS & GLONASS are currently in a pre-operational test phase which is due to be completed in the early 1990’s. In the meantime both systems have been proposed to the International Civil Aviation Organisation(ICA0) as possible candidates for future global navigation systems in civil aviation. In view of the importance of establishing adequate spacecraft performance before allowing their use, integrity monitoring of spacecraft has been proposed as an essential ingredient in securing safe operation. Since December 1990 tests have been conducted at the University of Leeds using a common C/A code receiver capable of measuring both GPS and GLONASS satellite epochs in a sequential mode. The aim has been to establish what level of performance is currently achieved with GPSIGLONASS . Measurements of the offsets between a local reference and the GPS and GLONASS system times have been made for all satellites. Plots of typical spacecraft performance over a single pass are included for both GPS and GLONASS, as well as typical system performance over a single day. The results are intended to establish a baseline for future integrity monitoring procedures, as well as indicating what effects on system performance might be anticipated should Selective Availability be re- introduced on GPS.
Published in:	Proceedings of the 4th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1991) September 11 - 13, 1991 Albuquerque, NM
Pages:	1063 - 1070
Cite this article:	Raby, P., Daly, P., Riley, S., "Integrity Monitoring Tests Conducted on GPS/GLONASS," Proceedings of the 4th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1991), Albuquerque, NM, September 1991, pp. 1063-1070.
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