The impact of unmodelled multipath on ambiguity resolution

Peter Joosten, Thomas Pany and Jon Winkel

Abstract:	In this contribution we will analyze the sensitivity of GPS ambiguity resolution for errors in the modeling of multipath. The analysis is based on an analytical, closed form formula for the probability of correct integer estimation. This formula is generally valid and may be applied to any of the GPS models currently in use, as well as to future triple frequency systems like modernized GPS or the envisioned European Galileo. The formula takes as input the variancecovariance matrix of the float solution and the bias in the float solution. This formula will be used to study the sensitivity of the GPS geometry-based model for multipath. The study will make use of data provided by the GNSS endto- end simulator as developed by J. Winkel of the Institute of Geodesy and Navigation of the University of the Federal Armed Forces, which is able to simulate GPS observations and allows for an explicit calculation of multipath. Using these data, the biases in the float solution can be computed, and consequently the effects of multipath on the feasibility of correct integer ambiguity resolution can be computed.
Published in:	Proceedings of the 15th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 2002) September 24 - 27, 2002 Oregon Convention Center Portland, OR
Pages:	953 - 961
Cite this article:	Joosten, Peter, Pany, Thomas, Winkel, Jon, "The impact of unmodelled multipath on ambiguity resolution," Proceedings of the 15th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 2002), Portland, OR, September 2002, pp. 953-961.
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