Efficient Ionospheric Model using Wavelet for Geomagnetic Storm

Kyoungho Sohn, Byungwoon Park, Changdon Kee

Abstract:	Ionospheric time delay is one of the main error source for single-frequency DGPS applications, including time transfer and Wide Area Differential GPS (WADGPS). Because this delay varies with the circumstance of ionosphere that satellite signals pass through, the distances between reference station and user is limited about 100 km generally. In case of WADGPS, ionosphere of service coverage is modeled on the measurements of overall stations and the correction messages are sent to single-frequency receiver user. So, grid-based algorithm was already developed for WADGPS but that algorithm is not applicable to geomagnetic storm condition in accuracy and management. In geomagnetic storm condition, the spatial distribution of vertical ionospheric delay is noisy and therefore the accuracy of modeling becomes low in grid-based algorithm and conventional single-scale function based algorithm. In this paper, we developed the ionospheric storm model using multi-scale wavelet based algorithm. This algorithm shows better accuracy with the same number of correction message than the existing algorithm and guarantees the continuity of correction messages when the number of message is expanded for geomagnetic storm condition.
Published in:	Proceedings of the 2009 International Technical Meeting of The Institute of Navigation January 26 - 28, 2009 Disney's Paradise Pier Hotel Anaheim, CA
Pages:	718 - 723
Cite this article:	Sohn, Kyoungho, Park, Byungwoon, Kee, Changdon, "Efficient Ionospheric Model using Wavelet for Geomagnetic Storm," Proceedings of the 2009 International Technical Meeting of The Institute of Navigation, Anaheim, CA, January 2009, pp. 718-723.
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