GLONASS Double Difference Ambiguity Resolution in Real-Time

Udo Rossbach

Abstract:	Undoubtedly, the combined use of GPS and GLONASS brings along a number of advantages as compared to the use of either of the systems alone. However, the different signal frequencies of the GLONASS satellites give rise to problems in the determination of double difference inte- ger ambiguities. This is the more concerning, since dou- ble difference carrier phase observations are preferably used for geodetic applications. Therefore, this topic is under investigation by different groups of scientists all over the world. In brief, the problem with GLONASS double differences is that either the receiver clock errors do not cancel, or the ambiguities are no longer of integer nature. Proposed solutions to this problem include confining to single dif- ferences or scaling GLONASS carrier phase measure- ments to a common frequency. This paper introduces an improved approach to tackle the problem of using GLONASS and GPS/GLONASS com- binations for high-precision geodetic applications. It is suitable for real-time operation, especially also for Real- Time Kinematic (RTK) applications. The approach is described in theory. Processing results are given, and its performance is evaluated.
Published in:	Proceedings of the 13th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 2000) September 19 - 22, 2000 Salt Palace Convention Center Salt Lake City, UT
Pages:	163 - 171
Cite this article:	Rossbach, Udo, "GLONASS Double Difference Ambiguity Resolution in Real-Time," Proceedings of the 13th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 2000), Salt Lake City, UT, September 2000, pp. 163-171.
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