New Concepts for a Carrier Phase Based GPS Positioning Using a National Reference Station Network

Bryan Townsend, Gérard Lachapelle, Luiz Paulo Fortes, Tor Egil Melgård, Torbjørn Nørbech, J. Raquet

Abstract:	Kværner Marine Automation (KMA) along with the Norwegian Mapping Authority (NMA) has put together a project to deploy a national DGPS RTK service in Norway. The project, named DeciPos, was initiated in early 1997. DeciPos is an augmentation to the existing GPS reference station network (SATREF®) operated by SK. SATREF® currently consists of 10 reference stations linked with high-speed data lines to a control center in Hønefoss, Norway. The GPS methodology incorporated in DeciPos is being developed in close cooperation with the University of Calgary. This approach uses a network of GPS reference stations to correct for the effect of correlated atmospheric and orbital errors on RTK positioning. Previous work has shown that a network approach provides more RTK coverage per reference receiver than the traditional single reference station approach. A comparison of data collected in September 97 and September 1998 shows that the method proposed is stable despite the increase in the level of ionospheric activity. Some real-time implementations issues are discussed. The latency of carrier phase data corrections based on the network is shown to have little effect on the quality of the results.
Published in:	Proceedings of the 1999 National Technical Meeting of The Institute of Navigation January 25 - 27, 1999 Catamaran Resort Hotel San Diego, CA
Pages:	319 - 326
Cite this article:	Townsend, Bryan, Lachapelle, Gérard, Fortes, Luiz Paulo, Melgård, Tor Egil, Nørbech, Torbjørn, Raquet, J., "New Concepts for a Carrier Phase Based GPS Positioning Using a National Reference Station Network," Proceedings of the 1999 National Technical Meeting of The Institute of Navigation, San Diego, CA, January 1999, pp. 319-326.
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