Advances in GPS/GLONASS Combined Solutions

Günter W. Hein, Udo Rossbach and Bernd Eissfeller

Abstract:	In combining GPS and GLONASS observations in one single or differential position solution we are facing four problems: (1) differences in the time frame, (2) differences in the coordinate datum, (3) Selective Availability (S/A) in GPS (only of minor nature in differential solutions) and (4) the problem of solving carrier phase ambiguities in combined carrier frequency solutions due to different GLONASS frequencies (only in high-precision carrier phase differential solutions). Although progress has been made to determine the coordinate transformation parameters in recent campaigns (see e.g. Rossbach et al., 1996) there are still uncertainties which result in errors in combined single positioning mode. In addition, in the transforma-tion and combined GPS/GLONASS solutions the effect of S/A adds to the remaining errors. This papers addresses a new approach which tries to cope with these two types of errors: S/A and residual uncertainties in the transformation parameters. In addition the authors present their improved solution for the determination of carrier phase ambiguities in a combined differential GPS/GLONASS approach.
Published in:	Proceedings of the 10th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1997) September 16 - 19, 1997 Kansas City, MO
Pages:	1533 - 1451
Cite this article:	Hein, Günter W., Rossbach, Udo, Eissfeller, Bernd, "Advances in GPS/GLONASS Combined Solutions," Proceedings of the 10th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1997), Kansas City, MO, September 1997, pp. 1533-1451.
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