Determination and Reduction of GPS Reference Station Multipath Using Multiple Receivers

J. Raquet and G. Lachapelle

Abstract:	A new method for reducing code and carrier-phase mul- tipath is tested which uses GPS receiver measurements from two or more receivers in order to obtain accur- ate estimates of code or carrier-phase multipath. This method generates a multipath estimate for each individual receiver/satellite pair on an epoch by epoch basis. One of the strengths of this method is that it uses double differen- cing from receivers in very close proximity to each other, so all correlated errors (including atmospheric errors) are significantly reduced. The effectiveness of this method is demonstrated in a kin- ematic field test involving one mobile receiver and four reference receivers. Single difference L1 code positioning of the mobile receiver was performed at distances between 5 and 29 km. When the reference receiver measurements were corrected using the new method and three additional reference receivers, there was a 28-35% improvement in positioning accuracy at the mobile receiver. It is also demonstrated that this method can be used in conjunction with other multipath mitigation techniques (such as carrier- phase smoothing).
Published in:	Proceedings of the 9th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1996) September 17 - 20, 1996 Kansas City, MO
Pages:	673 - 681
Cite this article:	Raquet, J., Lachapelle, G., "Determination and Reduction of GPS Reference Station Multipath Using Multiple Receivers," Proceedings of the 9th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1996), Kansas City, MO, September 1996, pp. 673-681.
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