Comparison Of The Two Alternate Methods Of Wide Area Carrier Phase Positioning

Dariusz Lapucha, Richard Barker and Henk Zwaan

Abstract:	In recent years new dual frequency carrier phase based real-time DGPS services have emerged to provide decimeter level positioning accuracy over wide areas. These services use geostationary satellite links to provide wide area coverage. The new positioning methods bridge the accuracy and coverage gap between meter level code based DGPS and prohibitively expensive centimeter level Real-Time Kinematic systems. In order to assure the highest level of integrity of the inherently ambiguous carrier phase positioning solution Fugro has developed two independent wide area carrier phase positioning methods. The first method uses the corrections from the multiple reference stations to mitigate the influence of the GPS satellite orbit and clock errors. The second method, instead of eliminating the orbit and clock errors along the line of sight from the reference stations, explicitly uses the satellite orbit and clock corrections without the reference stations. Both methods provide decimeter accuracy positioning. The paper reviews both carrier phase positioning methods. It describes the implementation of the methods in the operational real-time positioning services. It also presents the comparison results of the testing of the two methods. The results show better performance of the multiple reference station method. However both multiple reference station and precise orbit and clock methods achieved decimeter level positioning accuracy.
Published in:	Proceedings of the 17th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2004) September 21 - 24, 2004 Long Beach Convention Center Long Beach, CA
Pages:	1864 - 1871
Cite this article:	Lapucha, Dariusz, Barker, Richard, Zwaan, Henk, "Comparison Of The Two Alternate Methods Of Wide Area Carrier Phase Positioning," Proceedings of the 17th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2004), Long Beach, CA, September 2004, pp. 1864-1871.
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