The Geometry-Free Approach to Integer GPS Ambiguity Estimationc

N.F. Jonkman

Abstract:	The geometry-free approach is the simplest approach to integer GPS double differenced ambiguity estimation. It is based on an adjustment of the GPS observations according to the so-called geometry-free observation model. The geometry-free observation model parametrizes the GPS observations simply in carrier phase ambiguities and satellite-receiver ranges. In this study we will give a description of the geometry-free approach and present and analyze the results of a series of experiments concerning the repeated estimation with the geometry-free approach of integer ambiguities. The experiment results indicate that the geometry-free approach is a reliable method for dual frequency integer ambiguity resolution within short observation time spans - time spans of a few seconds - provided that the geometry-free observa-tion model does not contain unknowns for the residual ionospheric delays in the observations and that the length of the baseline is limited to 10 to 20 kilometres.
Published in:	Proceedings of the 11th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1998) September 15 - 18, 1998 Nashville, TN
Pages:	369 - 379
Cite this article:	Jonkman, N.F., "The Geometry-Free Approach to Integer GPS Ambiguity Estimationc," Proceedings of the 11th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1998), Nashville, TN, September 1998, pp. 369-379.
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