Development of a Real-Time Single-Frequency Precise Point Positioning System and Road Test Results

Y. Gao, Y. Zhang, K. Chen

Abstract:	Precise Point Positioning (PPP) has received wide attention in the past several years as one of the next generation RTK technologies. PPP can offer great flexibility and cost-saving to field positioning work as it can eliminates the need to deploy base stations. Centimetre to decimetre accurate positioning accuracy has been widely demonstrated for PPP using a dual-frequency GPS receiver. The requirement of a dual-frequency GPS receiver in PPP is for the elimination of the ionospheric effect, currently the largest error source in GPS measurements. Considering the fact that the majority of GPS receivers in use are single-frequency type, it is beneficial to investigate methods and algorithms for PPP using only a single-frequency GPS receiver. The emergence of precise ionospheric products has also pushed for research work on this direction. The major objective of this paper is to describe the development of a real-time single-frequency PPP system and test results under road and marine conditions. The paper will begin with an outline of the real-time singlefrequency PPP system including the observation and positioning models and error mitigation strategies which are essential to achieve the best position accuracy possible. Due to significant horizontal gradients in ionospheric densities, ionospheric gradient has been taken into account in the position determination and can be estimated in addition to zenith ionospheric parameters. Road testing of the real-time single-frequency PPP system has been conducted to assess its performance. The road environments include signal attention, blockage as well as multipath which represent real application environments The marine tests were conducted independently by a third party under operational conditions. Both test results have demonstrated decimetre to sub-metre accuracy which is very encouraging since so far only accuracy at sub-metre to several metres has been demonstrated for point positioning using a single-frequency GPS receiver.
Published in:	Proceedings of the 19th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2006) September 26 - 29, 2006 Fort Worth Convention Center Fort Worth, TX
Pages:	2297 - 2303
Cite this article:	Gao, Y., Zhang, Y., Chen, K., "Development of a Real-Time Single-Frequency Precise Point Positioning System and Road Test Results," Proceedings of the 19th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2006), Fort Worth, TX, September 2006, pp. 2297-2303.
Full Paper:	ION Members/Non-Members: 1 Download Credit Sign In