Real Time Estimation of Ionospheric Delays

Evelin Engler, Esther Sardon, and Dietmar Klahn

Abstract:	The estimation of the ionospheric delay in real time with GPS can be very useful, especially for high precision navigation applications. To estimate TEC in real time it is necessary to separate the ionospheric delay Tom the total error budget. Therefore, the reachable accuracy of the derived real time absolute values of slant TEC is determined by several parameters: number of epochs before the first ambiguity fixing, elevation cut-off, predicted or estimated satellite and receiver instrumental delays, and the multipath and its handling. Our method for real time TEC e&nation will be described and demonstrated with real observations, using two independently working GPS receivers. The influence of selected processing parameters on the reachable accuracy of the real time TEC will be shown. The evaluation of the quality will be obtained by comparison of the real time with the postprocessed TEC, using our reference receiver, and with the postprocessed TEC obtained using our station plus a subset of IGS stations. These comparisons will permit the determination of an optimized setup of real time estimation algorithms.
Published in:	Proceedings of the 8th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1995) September 12 - 15, 1995 Palm Springs, CA
Pages:	1183 - 1191
Cite this article:	Engler, Evelin, Sardon, Esther, Klahn, Dietmar, "Real Time Estimation of Ionospheric Delays," Proceedings of the 8th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1995), Palm Springs, CA, September 1995, pp. 1183-1191.
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