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基于大地水准面经典定义的地球重力场模型评价
作者姓名:丁剑  许厚泽  章传银
作者单位:1. 中国测绘科学研究院, 北京 100830; 2. 中国科学院测量与地球物理研究所, 武汉 430077; 3. 中国科学院大学, 北京 100049
基金项目:国家自然科学基金(41304009,41374081)和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
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OSU91A;EGM2008和EIGEN-6C4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-6C4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。

关 键 词:Gauss-Listing大地水准面经典定义  地球重力场模型  重力位离散度  精度评价  
收稿时间:2016-01-25
修稿时间:2016-03-20

Evaluation of earth gravitational models based on classic geoid definition
Authors:DING Jian  XU Houze  ZHANG Chuanyin
Institution:1. Chinese Academy of Surveying and Mapping, Beijing 100830, China; 2. Institute of Geodesy and Geophysics, Chinese Academy of Sciences, Wuhan 430077, China; 3. University of Chinese Academy of Sciences, Beijing 100049, China
Abstract:We propose an evaluation approach of earth gravitational models (EGMs) based on Gauss-Listing classic geoid definition.The classic geoid is defined as an equigeopotential surface.Using this character, we select a gravity geoid as reference surface, calculate the gravity potentials of different EGMs on the reference surface, and establish an index of gravity potential dispersion to evaluate EGMs.Using this approach we evaluate theoretical compliance abilities of different EGMs and of an EGM applied in different areas in the earth.The results show that the precision of EGM96 is higher than that of OSU91, and EGM2008 and EIGEN-6C4 have similar precisions.The results are consistent with the existing research conclusions.The results further declare that the precision of EGM2008 is slightly higher than that of EIGEN-6C4 in the cm level.
Keywords:Gauss-Listing classic geoid definition                                                                                                                        earth gravitational model(EGM)                                                                                                                        gravity potential dispersion                                                                                                                        accuracy evaluation
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