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

Y. Zhang, C. Bartone

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 site and user site 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 to not only augmented high accuracy positioning application using auxiliary ranging sources (ARS) such as lower earth orbiting satellites (LEOs) and earth bound pseudolites (PLs), but also 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 high accuracy DGPS based systems resolution performance in terms of simplicity, accuracy and availability.
Published in:	Proceedings of the 16th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS/GNSS 2003) September 9 - 12, 2003 Oregon Convention Center Portland, OR
Pages:	1248 - 1257
Cite this article:	Zhang, Y., Bartone, C., "A General Concept and Algorithm of Projected DGPS for High Accuracy DGPS Based Systems," Proceedings of the 16th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS/GNSS 2003), Portland, OR, September 2003, pp. 1248-1257.
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