Title: HIGH-PRECISION IONOSPHERIC TEC RECOVERY USING A REGIONAL-AREA GPS NETWORK
Author(s): Xiangqian Liao and Yang Gao
Published in: NAVIGATION, Journal of the Institute of Navigation, Volume 48, Number 2
Pages: 101 - 112
Cite this article: Liao, Xiangqian, Gao, Yang, "HIGH-PRECISION IONOSPHERIC TEC RECOVERY USING A REGIONAL-AREA GPS NETWORK", NAVIGATION, Journal of The Institute of Navigation, Vol. 48, No. 2, Summer 2001, pp. 101-112.
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Abstract: A new method of ionospheric total electron content (TEC) recovery has been developed and is described in this paper. It focuses on recovering ionospheric vertical TEC at centimeter accuracy using carrier phase as the principal observable from regional-area GPS networks. To eliminate satellite- and receiver-dependent biases, the double-difference technique is applied to derive reference network ionospheric measurements. A grid model with a moving window is used along with a streamlined Kalman filter to model and estimate the absolute vertical ionospheric TEC across the GPS network. Numerical tests have been carried out to assess the attainable accuracy of the ionosphere estimates using data from an operational GPS network. The results confirm that regional ionospheric TEC estimates can be determined at an accuracy of several centimeters.