User-Autonomous Ionospheric Correction for Hybrid Constellations

Jurn-Sun Leung

Abstract:	This paper discusses the feasibility of a user-autonomous ionospheric correction scheme with a hybrid (mixed single and dual civilian frequency) constellation. The local zenith total electron content (Tec)1 is modeled as sum of a nominal and a perturbation term. The nominal term could simply be the Klobuchar model from the GPS navigation message. The perturbation term is most conveniently described as a function of three independent variables: (1) the hour angle of the Sun, l, (2) the geomagnetic latitude, q, and (3) UT. An ionosphere filter making use of the available 2- frequency measurements employed to estimate the parameters in this perturbation term. The total Tec-function thus obtained can then be applied to compensate for the ionospheric delay of the 1-frequency measurements. This filter has a built-in mechanism to respond to the varying intensity of solar activity by monitoring rate of change of the ionosphere. The efficiency of this filter is demonstrated by some simulation results.
Published in:	Proceedings of the 11th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1998) September 15 - 18, 1998 Nashville, TN
Pages:	711 - 716
Cite this article:	Leung, Jurn-Sun, "User-Autonomous Ionospheric Correction for Hybrid Constellations," Proceedings of the 11th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1998), Nashville, TN, September 1998, pp. 711-716.
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