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中文摘要：
针对EGM08重力场模型构建过程中存在的不足,提出用GOCE重力场模型替换EGM08模型的中低频部分,用剩余地形模型RTM拓展EGM08模型的甚高频信号。模拟分析表明,GOCE模型能大幅提高高程异常计算的精度,而RTM对高程异常的贡献也不可忽视。实测GPS/水准数据表明,GOCE模型对高程异常的贡献达到43%,而RTM也贡献了1cm的精度。
英文摘要：
According to the deficiency existing in the EGM08 global gravity field model,a combined model is presented in this paper.The low and medium frequencies bands of the EGM08 model are substituted by a GOCE geopotential model,and very ultra-high frequencies signals are extended by a residual terrain model RTM.Simulant analyses show that the precision of height anomalies is widely improved by GOCE model,and the RTM＇s contribution to height anomalies cannot be ignored.The GPS/leveling benchmarks tests show that the GOCE model＇s contribution to height anomalies is up to43%,and RTM＇s contribution is 1cm.
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Derivation of the radial gradient of the gravity based on non-full tensor satellite gravity gradient
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