Ionospheric Effect in Instantaneous Positioning

M. Gende, S.M. Radicella, B. Nava, C. Brunini

Abstract:	Since May 2000, after removal of SA, GPS accuracy for navigation purposes has improved by one order of magnitude and the ionosphere has become the most important source of error in positioning calculation. The GPS includes a ionospheric model (ICA) in order to mitigate the ionospheric effect. Taking into account that the intentional degradation introduced by the SA was at least 10 times bigger than any other error, a systematic evaluation of the performance of the ionospheric model using GPS data was never carried out. This paper examines ICA capability to improve the accuracy confidence level for point positioning under different geographical conditions, different local times and seasons, during a period of high solar activity (year 2001). The comparison among uncorrected raw data, ionosphere-free linear combination and ionosphere-corrected solutions are shown and discussed. The single epoch positioning analysis are done using 30 seconds sample rate data of all visible satellites from a dozen of stations located in different geomagnetic latitudes.
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:	826 - 832
Cite this article:	Gende, M., Radicella, S.M., Nava, B., Brunini, C., "Ionospheric Effect in Instantaneous Positioning," Proceedings of the 2003 National Technical Meeting of The Institute of Navigation, Anaheim, CA, January 2003, pp. 826-832.
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