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中文摘要：
给出重力位模型计算高程异常的严密公式,用中国各地区实测的GPS/水准数据检核了EIGEN-6c2和EGM08模型的精度。结果表明,EIGEN-6c2模型高程异常的精度比EGM08模型提高了2~3 cm,尤其在青藏高原有显著提高,提高18 cm;同时确定出1985国家高程基准与全球高程基准（W0）系统差为26 cm。
英文摘要：
A rigorous formula for computing altitude anomaly with global geopotential model was proposed, and accuracy of two geopotential models, EIGEN-6c2 and EGM08 were checked using GPS/leveling data in different ar- eas. Results show that the accuracy of altitude anomaly of EIGEN-6c2 model is 2 - 3 cm higher than that of EGM08 model,especially,it is up to 18 cm in Tibetan plateau. Morerover, the system difference between 1985 national height datum and global height datum （ W0 ） is 26 cm determined by the formula.
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Derivation of the radial gradient of the gravity based on non-full tensor satellite gravity gradient
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