Precise Point Positioning with GPS Dual-Frequency Carrier-Phase Measurements using WADGPS Corrections

Hyunho Rho and Richard B. Langley

Abstract:	The goal of the research described in this paper is the design of a GPS dual-frequency carrier-phase data processing technique capable of producing high-accuracy positioning results with WAAS SBAS corrections. The main issues in using WAAS corrections for dual-frequency GPS precise point positioning (PPP) with carrier-phase measurements are the low resolution of WAAS fast clock corrections, the residual satellite orbit and clock errors and the residual clock reference issue (P1-C1 bias issue). A dual-frequency PPP algorithm which can utilize the carrier-phase ambiguity parameter to take into account the residual satellite orbit and clock errors as well as reducing the effects of clock reference issue has been designed. To account for the low resolutions of WAAS fast clock corrections, a weighted moving average filter was adopted and a proper smoothing factor has been carefully determined. Results determined via developed software indicate a few decimeter-level of positioning accuracy with WAAS orbit and clock corrections in kinematic mode could be attainable.
Published in:	Proceedings of the 25th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2012) September 17 - 21, 2012 Nashville Convention Center, Nashville, Tennessee Nashville, TN
Pages:	3683 - 3695
Cite this article:	Rho, Hyunho, Langley, Richard B., "Precise Point Positioning with GPS Dual-Frequency Carrier-Phase Measurements using WADGPS Corrections," Proceedings of the 25th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2012), Nashville, TN, September 2012, pp. 3683-3695.
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