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《Journal of the Graduate School of the Chinese Academy of Sciences》 2007-01
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An analysis of ionospheric grid model for satellite-based augmentation system

HUANG Zhi 1,2,3,4 YUAN Hong3 (1 Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan 430071, China;2 Graduate university, Chinese Academy of Sciences, Beijing 100049, China;3 Academy of Opto-Electronics, Chinese Academy of Sciences, Beijing 100080, China; 4 Xuzhou Normal University, Xuzhou 221116, China)  
In this paper, the algorithm of wide area augmentation system ionospheric grid correction was tested using 15 GPS stations' observational data. The span of data was from July 1 to 8 and from July 14 to 18, 2000, which represented quiet and disturbed geomagnetic conditions respectively. The paper discussed algorithmic accuracy and the emphasis was laid on the different latitude users and the stormy conditions. Using geostatistics method, this paper further analyzed the spatial correlation of ionospheric grid errors distribution in terms of integrity and availability. The results show that precision is high for user stations in the middle-high latitudes with the average of around 0.4m,but it relatively decreases for the lower latitude. The algorithm prediction error is larger under ionospheric stormy conditions, which is more prominent for the stations in the low latitudes. Correlation of residual error decreases with the great circle distance between pierce points increasing. For the ionospheric quiet behaviors residual error is small and correlation is high between neighboring errors, but it is the opposite for the storm time.
【Fund】: supported by the National Natural Science Foundation(40374054)
【CateGory Index】: P228.4
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