Accuracy Analysis of 3-D Ionospheric Tomography

Zhizhao Liu and Yang Gao

Abstract:	A 3D high precision ionospheric model is developed based on tomography technique. This tomographic model employs GPS data from a network of dual-frequency GPS receivers. The methodology of developing 3D ionospheric tomography model will be described in this paper but the focus will be placed on the 3D ionosphere model accuracy and performance analysis of the proposed ionospheric tomography model. First the 3D model’s ionosphere prediction accuracy is evaluated with referencing to the GPS measured ionosphere data. Next, the 3D ionosphere model together with other three different ionosphere models are applied to a GPS positioning application, namely, single point positioning (SPP). The performance of the 3D ionospheric model will be assessed by the positioning accuracy of the ionosphere error corrected SPP results and by the comparison to ionospheric corrections that are derived from others ionosphere correction models. The analysis of 24-hour data indicates that the short-term (5 minutes) ionosphere prediction based on the 3D model can obtain an accuracy of 0.15 to 0.24 meter on L1 frequency. SPP results show that 3D model’s effectiveness to mitigate the ionosphere errors is comparable to the dual-frequency ionosphere error removal method.
Published in:	Proceedings of the 15th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 2002) September 24 - 27, 2002 Oregon Convention Center Portland, OR
Pages:	1307 - 1312
Cite this article:	Liu, Zhizhao, Gao, Yang, "Accuracy Analysis of 3-D Ionospheric Tomography," Proceedings of the 15th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 2002), Portland, OR, September 2002, pp. 1307-1312.
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