The Usefulness of WADGPS Satellite Orbit and Clock Corrections for Dual-Frequency Precise Point Positioning

Hyunho Rho and Richard B. Langley

Abstract:	In this paper, we examine the accuracies of the WAAS and CDGPS orbits and clocks as well as investigate the possibility to use those WADGPS corrections in the precise point positioning domain. The methodology, which fully takes into account the different satellite antenna phase-center offsets used by the different agencies, assesses the CDGPS and WAAS satellite orbit and clock correction accuracies with respect to the International GNSS Service (IGS) precise orbit and clock products. Experimental results with a continuous five days worth of data show that user range errors observed with the WAAS satellite orbit and clock corrections is at about the 50 cm level and using the CDGPS satellite orbit and clock corrections, the user range errors are about the 20 cm level. The analyzed results also show that the WAAS satellite orbit and clock corrections are highly correlated and it is not valid to separately use them for a correction or validation. Precise point positioning (PPP) results obtained with the IGS, CDGPS and the WAAS satellite orbits and clocks are presented. PPP with IGS products produces the most accurate user results. The tests with the WADGPS corrections show that WADGPS orbit and clock corrections can be used for a PPP process with the carrierphase observables. However, it will be limited by slower parameter convergence compared to using IGS products and there might be a challenge for kinematic PPP.
Published in:	Proceedings of the 20th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2007) September 25 - 28, 2007 Fort Worth Convention Center Fort Worth, TX
Pages:	939 - 949
Cite this article:	Rho, Hyunho, Langley, Richard B., "The Usefulness of WADGPS Satellite Orbit and Clock Corrections for Dual-Frequency Precise Point Positioning," Proceedings of the 20th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2007), Fort Worth, TX, September 2007, pp. 939-949.
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