The First Study of Establishing China Grid Ionospheric Model

Yun-Bin Yuan and Ji-Kun Ou

Abstract:	This paper describes and reviews some of the key issues in establishing a grid ionospheric model (GIM) based on GPS data for the area of China. A new method and two other methods are used to estimate the possible precision of establishing large range high precision grid ionospheric model (GIM) with dual-frequency GPS data of the Chinese crust deformation monitoring network (CCDMN) using 10 stations and over 6 days. The preliminary results show that the average internal precision for the whole serviced areas is about 0.30 m and is about 0.20 m for the great majority of the areas. The results from the areas near Kun Ming (KM) and Guang Zhou (GZ) are the poorest and the precision are 0.59 m and 0.70 m, respectively, and the effective rate of time periods (i.e. when the extreme error are less than 1.5 m (2.0 m)) during a day for KM are 85.34% (94.10%) and are 85.18% (91.35%) for GZ. According to the statistical results of the different longitude, latitude belts and some critical lattices, it can be seen that the three different precisions above are the worst for the two grid elements, whose latitudes are (20 ! , 25 ! ) and whose longitudes are (100! , 105! ) and (110! ,115! ), respectively. The results are 0.75 m, 87.20% (92.10%) for one of these and 0.66 m, 84.50% (92.60%) for the other one. The whole external precision is 0.58 m. The area distribution character of the external precision is similar to that of the internal precision. This experiment shows that it is possible to establish a real time high precision grid ionospheric model for the area of China using the GPS data collected by the national crust deformation monitoring network. Finally, some preliminary suggestions are given.
Published in:	Proceedings of the 14th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 2001) September 11 - 14, 2001 Salt Palace Convention Center Salt Lake City, UT
Pages:	2516 - 2524
Cite this article:	Yuan, Yun-Bin, Ou, Ji-Kun, "The First Study of Establishing China Grid Ionospheric Model," Proceedings of the 14th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 2001), Salt Lake City, UT, September 2001, pp. 2516-2524.
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