GLONASS Performance: Measurement Data Quality and System Upkeep

P. Misra, M. Pratt, R. Muchnik, B. Burke, and T. Hall

Abstract:	With three launches each in 1994 and 1995, each launch placing three satellites in orbit, GLONASS achieved an important milestone of 24 working satellites in January 1996. Since then, the system has maintained a constellation of 20-22 working satellites. We review the status of the GLONASS constellation, health and availability of signals, data quality, and system upkeep practices based on measurements taken over recent months. The quality of the position estimates obtained from GLONASS has remained comparable to that from GPS with Selective Availability (SA) off. The rms value of the user range error (URE) for GLONASS has remained about IO m, as compared to 25 m for GPS with SA active. The issues of system upkeep and control have been examined via an analysis of the navigation messages for regularity of the data uploads, changes in parameter values at uploads, and the handling of the system anomalies.
Published in:	Proceedings of the 9th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1996) September 17 - 20, 1996 Kansas City, MO
Pages:	261 - 270
Cite this article:	Misra, P., Pratt, M., Muchnik, R., Burke, B., Hall, T., "GLONASS Performance: Measurement Data Quality and System Upkeep," Proceedings of the 9th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1996), Kansas City, MO, September 1996, pp. 261-270.
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