Evaluation of a Multi-Base-Station Differential Approach

N. Kjorsvik, O. Ovstedal, J.G.G. Svendsen, L.E. Blankenberg

Abstract:	In airborne applications (e.g. photogrammetry, gravimetric measurements and laser scanning) the positions of the sensors are determined by Global Navigation Satellite Systems (GNSS). Traditionally, this has been done with differential techniques using GNSS observations from one reference station only. In this work the alternative approach of Multi-Base-Station (MBS) differential processing is discussed and verified. In the MBS approach, data from a network of permanent reference stations are used to estimate the spatially correlated errors. Improved reference station data can be materialized as e.g. observations from a Virtual Reference Station (VRS). Software has been implemented in order to reduce the effect of site dependent errors and to estimate the spatially correlated errors. Improved reference station data is generated as a Virtual Reference Station. Results from a photogrammetric test flight over a dedicated test field in Fredrikstad, Norway are presented. Independent reference positions are estimated using photogrammetric aerial triangulation and compared to the positions from various GNSS processing strategies. The results verify that the method of Multi-Base-Station processing has several attractive properties.
Published in:	Proceedings of the 16th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS/GNSS 2003) September 9 - 12, 2003 Oregon Convention Center Portland, OR
Pages:	1381 - 1389
Cite this article:	Kjorsvik, N., Ovstedal, O., Svendsen, J.G.G., Blankenberg, L.E., "Evaluation of a Multi-Base-Station Differential Approach," Proceedings of the 16th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS/GNSS 2003), Portland, OR, September 2003, pp. 1381-1389.
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