GPS Network Design and Error Mitigation for Real-Time Continuous Array Monitoring Systems

Shaowei Han and Chris Rizos

Abstract:	In this paper a near real-time (typically a baseline update once per hour, or once per day) continuous array system, with at least three dual-frequency GPS receivers connected to the IGS network, and many single frequency receivers, is proposed for monitoring applications covering a region of 50km radius, A weighted differential GPS method, appropriate for the suggested array design, can be implemented in order to eliminate or mitigate the orbit bias, including the effects of SA. A local area epoch-by-epoch and satellite-by-satellite ionospheric delay model, determined using dual-frequency observations, is used to correct single frequency observations. Tropospheric delay is taken into account by modelling it as a first order Gauss-Markov (or random walk) process with temporal correlations. Multipath elimination is achieved by using an Finite Impulse Response (FIR) lowpass filter for the local ionospheric delay model and multipath extraction using an FIR bandpass filter to account for the multipath in real-time. The biases dependent on the GPS receiver and antenna are also discussed and associated optimaI network designs for data processing are suggested. In addition, efficient and reliable ambiguity resolution, and automatic cycle slip detection and repair procedures will be incorporated. This system would be capable of millimeter horizontal accuracy and centimeter vertical accuracy, and is intended to address real-time applications for earthquake studies, and for volcano and engineering deformation monitoring.
Published in:	Proceedings of the 9th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1996) September 17 - 20, 1996 Kansas City, MO
Pages:	1827 - 1836
Cite this article:	Han, Shaowei, Rizos, Chris, "GPS Network Design and Error Mitigation for Real-Time Continuous Array Monitoring Systems," Proceedings of the 9th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1996), Kansas City, MO, September 1996, pp. 1827-1836.
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