A Controlled Experiment of Real-Time Precise Point Positioning for Deformation Monitoring

Min Wang and Yang Gao

Abstract:	The availability of GPS precise orbit and clock products has made it feasible for the development of PPP (Precise Point Positioning) that uses a single GPS receiver to derive centimeter to decimeter accurate positioning solutions. PPP also has great potential to be used for deformation monitoring applications. This paper has designed a controlled experiment to investigate the potential and capability of PPP for real-time deformation monitoring and to answer questions such as how small a displacement can be detected and how the quality of the precise orbit and clock products would affect the displacement detection performance. The displacement simulated in the controlled experiment ranges from ± 0.4 cm to ± 8 cm. The true motion or displacement of the GPS antenna over a 3.6 m long baseline is determined using double-difference ambiguity fixed solutions. The PPP performance for real-time deformation monitoring is examined using two real-time precise orbit and clock products, namely, the IGS (International GNSS Service) Ultra-Rapid predicted half and the JPL (Jet Propulsion Laboratory) IGDG (Internet- Based Global Differential GPS) corrector. The experiment results indicate that real-time PPP is able to detect deformation of centimeter level with the JPL IGDG real-time result slightly better than the IGS Ultra-Rapid predicted half result because the former has higher data rate for clock corrections. The data collected in the controlled experiment is also processed in post-mission using the IGS Final orbit and JPL Final clock products and IGS Rapid orbit and clock products, providing better performance than the real-time results.
Published in:	Proceedings of the 2008 National Technical Meeting of The Institute of Navigation January 28 - 30, 2008 The Catamaran Resort Hotel San Diego, CA
Pages:	585 - 594
Cite this article:	Wang, Min, Gao, Yang, "A Controlled Experiment of Real-Time Precise Point Positioning for Deformation Monitoring," Proceedings of the 2008 National Technical Meeting of The Institute of Navigation, San Diego, CA, January 2008, pp. 585-594.
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