| 利用重力等位面特性进行地球重力场模型评价 |
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| 引用本文： | 丁剑,许厚泽,章传银.利用重力等位面特性进行地球重力场模型评价[J].武汉大学学报(信息科学版),2018,43(6):832-839. |
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| 作者姓名： | 丁剑 许厚泽 章传银 |
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| 作者单位： | 1.中国测绘科学研究院, 北京, 100830 |
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| 基金项目： | 国家自然科学基金41304009国家自然科学基金41374081地理空间信息工程国家测绘地理信息局重点实验室开放研究基金777142109 |
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| 摘 要： | 提出了一种基于大地水准面等位面特性的地球重力场模型优劣评价方法。通过取任一重力大地水准面为参考面，计算不同地球重力场模型在该面上的重力位标准差，以此作为不同模型相对优劣的评价指标。利用该方法对不同地球重力场模型以及同一重力场模型在不同区域的精度进行了评价。结果表明:EGM96、OSU91A模型的大地水准面高精度分别为±11.1 cm、±14.3 cm，说明EGM96要优于OSU91A，EGM2008、EIGEN-6C4模型的大地水准面高精度分别为±8.8 cm、±8.9 cm，说明该两个模型的精度相当，与已有研究结果一致，表明本文方法的有效性与适用性。进一步研究结果显示，对于全球大地水准面，EGM2008和EIGEN-6C4模型的大地水准面高精度分别为±11.3 cm和±14.1 cm，即在厘米级精度上EGM2008略优。
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| 关 键 词： | 大地水准面 地球重力场模型 重力位标准差 精度评价 |
| 收稿时间： | 2016-02-18 |
To Evaluate Earth Gravitational Model Using Equigeopotential Character |
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| Affiliation: | 1.Chinese Academy of Surveying and Mapping, Beijing 100830, China2.Institute of Geodesy and Geophysics, CAS, Wuhan 430077, China3.University of Chinese Academy of Sciences, Beijing 100039, China4.Key Laboratory of Geo-Informatics of National Administration of NASG, Beijing 100830, China |
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| Abstract: | This paper proposes an evaluation approach for an earth gravitational model(EGM), which is based on the equigeopotential surface character of the geoid. We select a gravity geoid as reference surface, calculated the gravity potentials of different EGMs on the reference surface, to build an index of gravity potential standard deviation to evaluate EGMs. We evaluated the theoretical ability for compliance of different EGMs and the same EGM applied in different areas of the earth using the approach. The results show that the geoid precisions of EGM96 and OSU91A are respectively ±11.1 cm and ±14.3 cm, meaning that the precision of EGM96 is better than that of OSU91A, while the EGM2008, EIGEN-6C4 are similar in precision. These are consistent with the existing research conclusions. But, the result further suggests that the precision of EGM2008 is slightly better than that of EIGEN-6C4 at the cm level. |
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