Combined GPS/GLONASS Data Processing

Steven M. Chamberlain and John Chuang

Abstract:	The United States' Global Positioning System (GPS)consisting of a 24 satellite constellation is expected to be in full operation near the end of 1992. Likewise the Soviet Union's Global Navigation System (GLONASS) consistino of a 24 satellite constellation could also be in full operation at about the same time. Although the two systems have been implemented differently, their ooeration and ourpose is fundamentally the same. By selectively combining data received from both systems the resulting position fix accuracy and reliability should be greater than by using data received from either system individually. With the combined 48 satellite constellation, three dimensional coverage is assured virtually anywhere on earth and the probability of degraded position fixes due to satellite shadowing or satellite failure is substantially reduced. Magnavox has developed the first combined GPS/GLONASS navigator. This paper addresses the problems encountered in combining data from the two systems which use different time references and different datums. Test results are presented comparing combined versus independent satellite system usage. An update on each satellite system's status is also presented.
Published in:	Proceedings of the 1991 National Technical Meeting of The Institute of Navigation January 22 - 24, 1991 Sheraton San Marcos Hotel Phoenix, AZ
Pages:	25 - 33
Cite this article:	Chamberlain, Steven M., Chuang, John, "Combined GPS/GLONASS Data Processing," Proceedings of the 1991 National Technical Meeting of The Institute of Navigation, Phoenix, AZ, January 1991, pp. 25-33.
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