Integrated Use of GPS and GLONASS in Civil Aviation Navigation II: Experience With GLONASS

P. Misra, E. Bayliss, R. Lafrey, M. Pratt, and R. Hogaboom

Abstract:	Pursuant to a bilateral agreement signed in 1988, both the US and the USSR are in the process of examining the integrated use of GPS and GLONASS for civil aviation navigation. The combination of signals available for civil use from the two autonomous systems offers the promise of an accurate and economical sole-means navigation system. An FAA-sponsored program at Lincoln Laboratory is aimed at examining the technical issues associated with such integrated use, and to establish the performance achievable therefrom. A SatNav data collection and analysis facility, comprising GPS and GLONASS receivers and the supporting computer systems, has been established at Lincoln Laboratory. In this paper, we present results based on an analysis of the measurements from GLONASS collected at this facility over a six-month period (February-July 1991). While our main interest is in the positioning results obtained from GLONASS, we also examine some important issues related to the system operations. The findings are generally consistent with the technical data provided by the Soviets. The GLONASS positioning results are compamble to those provided by the GPS Standard Positioning Service (SPS), when the Selective Availability (SA) feature of the latter is off. When the GPS signal is degraded via SA, the GLONASS position estimates would be clearly better. Of course, the positioning accuracy reflects directly on the quality of the system upkeep and control. We have analyzed the navigation messages in order to understand the nominal patterns of data uploads, changes in parameter values at uploads, and the handling of the system anomalies. We discuss these findings and identify some issues requiring further clarification.
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:	321 - 332
Cite this article:	Misra, P., Bayliss, E., Lafrey, R., Pratt, M., Hogaboom, R., "Integrated Use of GPS and GLONASS in Civil Aviation Navigation II: Experience With 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. 321-332.
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