Ionospheric Error Compensation for GPS Receivers Using Real-Time Ionospheric Model

T.R. Jenkins, B. Wu, P. Nicolaides, and T.N. Upadhyay

Abstract:	This paper describes a new technique that combines a Real-time Ionospheric Model (RIM) , which is developed at MayRower based on the well-known Parameterized Ionospheric Model (PIM) Version 1.2, with an adaptive random field Kalman filter to provide Total Electron Content (TEC) compensation for GPS satellite measurements. By using dual frequency GPS pseudo- range and carrier phase measurements with RJM, an instantaneous lo& TEC map can be constructed for the entire visible horizon. The resultant TEC map is represented by RIM plus a perturbation field, estimated by using the carrier phase smoothed TEC measurements. Its indicated values can be applied for ionospheric range error compensation for any line-of-sight in the local horizon. When there are no TEC measurements, the ionospheric map will slowly degrade to that represented by PIM. This new technique effectively compensates the ionospheric error and significantly reduces the computation requirement demanded by PIM model. The corresponding algorithm together with RIM can be implemented on a microprocessor and used in real-time GPS applications with high precision accuracy requirements.
Published in:	Proceedings of the 9th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1996) September 17 - 20, 1996 Kansas City, MO
Pages:	575 - 583
Cite this article:	Jenkins, T.R., Wu, B., Nicolaides, P., Upadhyay, T.N., "Ionospheric Error Compensation for GPS Receivers Using Real-Time Ionospheric Model," Proceedings of the 9th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1996), Kansas City, MO, September 1996, pp. 575-583.
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