中国东部GRACE全球重力场模型的精度分析
Precision and Analysis of GRACE Global Gravity Field Model in East China
本文通过比较最新GRACE地球重力场模型EIGEN_GRACE02S与EGM96模型在中国东部区域与WDM94模型重力场参量残差的差异，分析差异产生的原因及分布，进而研究新一代卫星重力方法对于提高区域重力场模型精度的潜力以及存在的问题。比较结果证明卫星跟踪卫星方法对于现有模型中低阶部分有明显改善。论文还发现EIGEN模型该区域存在沿纬度方向的周期性系统误差，引起这种误差的原因值得进一步研究。另外，论文的比较分析方法也可作为卫星重力观测标定的一种参考手段。
In this paper, with East China as the region in test, the potential of the new satellite gravity technology, Satellite-to-Satellite Tracking, to improve the precision of regional gravity field model is studied. With WDM94 as reference, the gravity parameter residuals of two models, the latest GRACE global gravity field model (EIGEN_GRACE02S) and EGM96, are computed and compared. The causes for the differences between the residuals of the two models are discussed. The along-latitude and along-longitude distributions of the residuals are analyzed. The comparison between the residuals shows that in the selected region, EIGEN_GRACE02S is better than EGM96 by about 15%. From the analysis of the along-latitude distribution of the residuals, it is found that some systematic errors with periodical properties exist in the EIGEN model. The results of the paper can also be taken as references in the validation of the SST gravity data.
罗志才、汪海洪、罗佳、宁津生
地球物理学
卫星跟踪卫星，重力场，GRACE，卫星重力标定
satellite-to-Satellite Tracking Gravity Field GRACE
罗志才,汪海洪,罗佳,宁津生.中国东部GRACE全球重力场模型的精度分析[EB/OL].(2004-12-14)[2025-07-21].http://www.paper.edu.cn/releasepaper/content/200412-39.点此复制
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