A General Concept and Algorithm of Projected DGPS for High-Accuracy DGPS-Based Systems

Yujie Zhang and Chris Bartone

Peer Reviewed

Abstract:	Typical high-accuracy relative differential GPS (DGPS) solutions define single differences (SDs) based on the assumption that the unit vectors from both the reference and user sites to the satellite are parallel. However, the parallel assumption is challenged by the nonlinearity problem in augmented DGPS and long-baseline high-accuracy DGPS systems. This paper proposes the general concept of Projected DGPS (PDGPS) to effectively remove the nonlinear geometry bias in a closed-form solution. PDGPS is applicable not only to augmented highaccuracy positioning applications using auxiliary ranging sources (ARS), such as low earth-orbiting satellites (LEOs) and earth-bound pseudolites (PLs), but also to medium- and long-baseline applications using medium earth-orbiting satellites (MEOs). Simulation results and real-data test results are presented. The conclusion is drawn that PDGPS significantly improves the resolution performance of high-accuracy DGPS-based systems in terms of simplicity, accuracy, and reliability.
Published in:	NAVIGATION: Journal of the Institute of Navigation, Volume 51, Number 4
Pages:	293 - 310
Cite this article:	Zhang, Yujie, Bartone, Chris, "A General Concept and Algorithm of Projected DGPS for High-Accuracy DGPS-Based Systems", NAVIGATION: Journal of The Institute of Navigation, Vol. 51, No. 4, Winter 2004-2005, pp. 293-310.
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