Carrier Phase Multipath Calibration of GPS Reference Stations

Lambert Wanninger and Manja May

Abstract:	Based on available GPS reference network observations we developed, implemented and tested a procedure to es- timate carrier phase multipath corrections. This procedure consists of three steps: detection and localization of mul- tipath affected satellite signals, daily estimations of multi- path errors, and combination of these daily estimates to corrections for undifferenced L1 and L2 phase measure- ments. W e examined the variability of carrier phase multipath effects over one year in order to estimate the influence wetness and snow have on the reflectors. Whereas on days with continuous rainfall our multipath corrections worked as well as usually, on some days with snow cover multipath errors were altered. In order to prove the successful calibration and correction of carrier phase multipath errors, we compared the dou- ble-differenced residuals of short and of long baselines for both uncorrected and corrected observations. Multi- path errors could be significantly reduced for often used linear combinations of the dual-frequency observations, but not for the original L1 and L2 observations them- selves. The reason can be found in the small multipath ef- fects compared to a larger influence of remaining iono- spheric errors in the multipath corrections.
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:	132 - 144
Cite this article:	Updated citation: Published in NAVIGATION: Journal of the Institute of Navigation
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