基于大地水准面经典定义的地球重力场模型评价

发布时间：2018-03-29 11:57

本文选题：Gauss-Listing大地水准面经典定义　切入点：地球重力场模型　出处：《中国科学院大学学报》2016年04期

【摘要】：提出一种基于Gauss-Listing经典大地水准面定义的地球重力场模型评价方法.该方法依据经典大地水准面为重力等位面的特性,以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参考面上的重力位离散度,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理论表达能力进行评价.结果表明:EGM96和OSU91A模型的大地水准面精度分别为±11.1 cm和±14.3 cm,说明EGM96要优于OSU91 A;EGM2008和EIGEN-6 C4模型的大地水准面精度分别为±8.8 cm和±8.9 cm,说明这两个模型的精度相当.这些结果均与已有研究结果一致.该模型评价方法的研究结果显示:对于利用EGM2008确定的全球大地水准面,EGM2008和EIGEN-6 C4模型的全球大地水准面表达精度分别为±11.3 cm和±14.1 cm,即在厘米级精度上EGM2008要优于EIGEN-6C4.
[Abstract]:A method for evaluating the gravity field model of the earth based on the definition of the classical geoid of Gauss-Listing is presented, which is based on the characteristic that the classical geoid is a gravity isotropic surface and takes any gravity geoid as the reference surface. To calculate the dispersion of gravity potential on the reference plane of different earth gravity field models, The method is used to evaluate the theoretical expression ability of different Earth gravity field models and the same gravity field model in different regions. The results show that the weight EGM96 and OSU91A models are large. The accuracy of geoid is 卤11.1 cm and 卤14.3 cm respectively, which indicates that the geoid accuracy of EGM96 is better than that of OSU91 Agne M2008 and EIGEN-6 C4, which is 卤8.8 cm and 卤8.9 cm, respectively, indicating that the accuracy of these two models is the same. These results are consistent with those of previous studies. The results of the model evaluation method show that the global geoid expression accuracy of the global geoid determined by EGM2008 is 卤11.3cm and 卤14.1 cm respectively, which means that EGM2008 is superior to EIGEN-6C4 in centimeter accuracy.
【作者单位】：中国测绘科学研究院;中国科学院测量与地球物理研究所;中国科学院大学;
【基金】：国家自然科学基金(41304009;41374081) 地理空间信息工程国家测绘地理信息局重点实验室2014年度开放研究基金(777142109)资助
【分类号】：P223

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