EIGEN-CG01C用于GPS高程转换的精度分析

ACCURACY ANALYSIS OF GPS HEIGHT TRANSFORMATION WITH EIGEN-CG01C MODEL

介绍了综合CHAMP、GRACE卫星数据和地面重力数据得到的最新重力场模型EIGEN-CG01C,利用GPS水准数据探讨了该模型用于GPS高程转换的精度问题,并同EGM96模型进行了比较。统计结果表明:在我国西部某区域(2000km×2000km)的范围内、点间距100km的情况下,该模型用于GPS高程转换的精度约0.7m;在我国中、东部的3个小区域算例中,该模型的精度分别约0.13m、0.05m和0.06m,均优于EGM96模型的精度。

The new gravity field model EIGEN-CG01C combining CHAMP and GRACE data and surface gravity data is introduced in this paper. The accuracy of GPS height transformation based on GPS leveling data with this model is discussed and the results are compared with that with model EGM96. The statistical results show that the accuracy of GPS height transformation with model EIGEN-CG01C is closed to 0.7 m in the west part of China for the region of 2 000 km×2 000 km at the interval of 100 km,and about 0.13 m,0.05 m and 0.06 m for three cases in the middle and east of China respectively. All of the results is better than that with model EGM96.