Very Precise Differential GPS - Development Status and Test Results

Xinhua Qin, Sergei Gourevitch and Mark Kuhl

Abstract:	VPDGPS is Ashtech’s package for realizing the ultimate accuracy’s that GPS relative navigation is capable of achieving. It utilizes the full P-code observable set for real-time positioning at decimeter to centimeter levels of accuracy. It takes advantage of precise dual band P-code pseudorange and carrier phase observables and is capable of on-the- fly ambiguity resolution. This PC-based system consists of two dual band P- code receivers, a 25-MHz 486 processing unit, and a reliable data link. One receiver set-up - the base receiver - is placed at a known point to broadcast the raw observables collected from the reference station. The other receiver set-up - the rover - along with the processing unit, will be tracked. The system set-up can be reversed; i.e., transmitting observables from the rover receiver and estimating the rover trajectory at a stationary base station. The parameter estimation engine for VPDGPS is a Kalman filter. Depending on what observables are available and the processing options selected, the program can estimate real-time, three-dimensional position and velocity with accuracy’s ranging from meter level (conventional DGPS) to sub-centimeter (UPDGPS). The VPDGPS system will find use in applications ranging from real-time land surveying to aircraft auto-landing. This paper wiIl discuss the system configuration, development strategies, and applications and present the preliminary test results.
Published in:	Proceedings of the 5th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1992) September 16 - 18, 1992 Albuquerque, NM
Pages:	615 - 624
Cite this article:	Qin, Xinhua, Gourevitch, Sergei, Kuhl, Mark, "Very Precise Differential GPS - Development Status and Test Results," Proceedings of the 5th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1992), Albuquerque, NM, September 1992, pp. 615-624.
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