Atmosphere Decomposition for VRS Based Network-RTK System

S. Zhang, S. Lim, C. Rizos, J. Guo

Abstract:	The atmospheric delay is the main error source for medium-range relative GPS positioning, and therefore is the main challenge for Network-RTK systems. The double-differenced tropospheric and ionospheric delays are decomposed from the double differenced ionosphere-free and geometry-free combinations. However, for a Network-RTK system, the atmospheric delays are required to be expressed as single-differenced or zero-differenced values, it is necessary to decompose the atmospheric delays from double-differenced values to single-differences. As tropospheric delays are non-dispersive, they are calculated with long duration data series, and the zero-differenced tropospheric delays can be extracted using tropospheric mapping functions. In the case of the ionospheric delays, the single-differenced ionosphere delays are calculated using a constraint condition derived from the predicted total electron content information.
Published in:	Proceedings of the 22nd International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2009) September 22 - 25, 2009 Savannah International Convention Center Savannah, GA
Pages:	2707 - 2716
Cite this article:	Zhang, S., Lim, S., Rizos, C., Guo, J., "Atmosphere Decomposition for VRS Based Network-RTK System," Proceedings of the 22nd International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2009), Savannah, GA, September 2009, pp. 2707-2716.
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