多个超高阶重力场模型精度分析

The Accuracy Analysis of Multiple Ultra-High-Degree Gravity Field Models

分析了国际和国内公布的EGM2008、GECO、Eigen6c4、UGM2005、DQM2000d和DQM2006等超高阶重力场模型的内符合精度;利用中国境内的实测GPS/水准数据对各类模型进行了外符合精度检验;结合不同的方法对系统差进行了处理;最后基于试验区数据讨论了不同模型之间频谱组合方法对高程异常计算结果的改善情况。实验表明,Eigen-6C4模型具有更高的内符合精度,国内公布的UGM2005和DQM2006两种模型精度相当;本文提出的十参数法相比于传统四参数方法精度获得了4.6%~22.20%的提升;GECO模型和Eigen-6C4模型在实验区内外符合精度较好;不同模型之间的频谱组合可以在一定程度上提高试验区内模型确定高程异常的精度。

In this paper, the internal accord accuracy of several ultra-high-degree gravity models is analyzed, such as EGM2008, GECO, Eigen-6 C4, UGM2005, DQM2000 d and DQM2006, which are published in recent years.Besides their external accord accuracy is examined based on GPS/leveling data in China. The systematic error is eliminated via different methods, finally the improvement is presented based on the spectrum combination theory between different models. Results show that Eigen-6 C4 reveals the highest internal accord accuracy among others,and UGM2005 equals DQM2006; compared with the traditional method, the nine-parameter-method has improved by 4.6% ~ 22.20% in systematic error elimination; when it comes to external accord accuracy, GECO and Eigen-6 C4 are preeminent. What＇ s more, the spectrum combination theory between different models can improve the accuracy of model-determined height anomaly.