Tropospheric Delay Modelling for the European Space Agency’s Galileo Testbed: Methods of Improvement and First Results

A. Posfay, E. Krueger, T. Schueler, G.W. Hein

Abstract:	The European Space Agency ESA has initiated its Galileo Testbed in early 2002 which has - among others - the purpose of extensively evaluating all components of the Galileo error budget and to improve it where possible. One remaining burden to the error budget is the uncertainty of the tropospheric propagation delay which is about 2.5 metres in zenith direction and a factor of 3 higher for elevations as low as 15 degrees. Reducing this error component results in an improved performance for most elements of the Galileo ground segment including more accurate positioning and orbit determination and, also worth to mention, in a significant reduction of the threshold for outlier detection with respect to the integrity monitoring algorithms. This paper presents some of the strategies applied to reduce the tropospheric error component as well as first results for selected sites.
Published in:	Proceedings of the 2003 National Technical Meeting of The Institute of Navigation January 22 - 24, 2003 Disneyland Paradise Pier Hotel Anaheim, CA
Pages:	817 - 825
Cite this article:	Posfay, A., Krueger, E., Schueler, T., Hein, G.W., "Tropospheric Delay Modelling for the European Space Agency’s Galileo Testbed: Methods of Improvement and First Results," Proceedings of the 2003 National Technical Meeting of The Institute of Navigation, Anaheim, CA, January 2003, pp. 817-825.
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