Comparative Study on OEM-Based Differential GPS

Mohammed Hossam-e-Haider and Zhang Qishan

Abstract:	Differential GPS (DGPS) is a technique that significantly improves the positioning accuracy of the GPS. DGPS requires high quality GPS “reference receiver” at known location. The reference station estimates the slowly varying error components of each range measurement and forms a correction for each GPS satellite in view. This correction is broadcast to all DGPS users on a convenient communication link and accordingly the user receivers made correction. The differential correction greatly improves the positioning accuracy to all users. This improvement arises because the largest GPS errors vary slowly with time and are strongly corrected over distance. In this paper two kinds of DGPS technique, position space differential GPS and range space differential GPS has been studied and compared their performance. Positioning experiments are separately carried out by single GPS receiver, position space DGPS and range space DGPS receiver based on GPS-OEM board. Experimental results indicate that position error is about 100 meters for single GPS receiver and is reduced to 3~8 meters for DGPS. Furthermore, developed DGPS system based on GPS-OEM has the advantages of low cost and flexible in utility.
Published in:	Proceedings of the 13th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 2000) September 19 - 22, 2000 Salt Palace Convention Center Salt Lake City, UT
Pages:	305 - 310
Cite this article:	Hossam-e-Haider, Mohammed, Qishan, Zhang, "Comparative Study on OEM-Based Differential GPS," Proceedings of the 13th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 2000), Salt Lake City, UT, September 2000, pp. 305-310.
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