Rapid Static and Kinematic Positioning with Hong Kong GPS Active Network

Wu Chen, Congwei Hu, Yongqi Chen and Xiaoli Ding

Abstract:	The Lands Department of Hong Kong government is establishing a permanent GPS array of reference stations for various applications, including engineering surveying, navigation and other scientific research. Due to the low latitude of Hong Kong located at (~22o), the ionospheric effects are the major errors in GPS positioning. In practice, it is difficult to carry out RTK operation in Hong Kong with existing commercial GPS software as the integer ambiguities of carrier phase measurements could not be fixed in most of time in daytime. This paper presents method that utilises the reference network to model the double difference ionospheric residuals. This algorithm significantly improves not only the success rate of ambiguity resolution, but also the positioning accuracy. Tests demonstrate that the success rate of ambiguity resolution increases from 45% with conventional methods to 100% with this algorithm, using 15 minutes GPS L1 observation. The positioning accuracy also increases from 2 cm to 5 mm horizontally and from 4 cm to 3 cm vertically.
Published in:	Proceedings of the 14th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 2001) September 11 - 14, 2001 Salt Palace Convention Center Salt Lake City, UT
Pages:	346 - 352
Cite this article:	Chen, Wu, Hu, Congwei, Chen, Yongqi, Ding, Xiaoli, "Rapid Static and Kinematic Positioning with Hong Kong GPS Active Network," Proceedings of the 14th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 2001), Salt Lake City, UT, September 2001, pp. 346-352.
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