摘要
全球重力场模型在卫星精密定位、大地水准面精化、重力法探矿、气候变化研究、地球物理学、地质学和海洋学等诸多领域都有非常重要的意义。据此,总结了全球重力场模型的研究进展,简要介绍了重力位模型计算扰动场元的方法与公式,对比了勒让德函数递推几种方法的效率。利用我国范围内实测的GPS/水准数据和垂线偏差数据对两个超高阶地球重力场模型EGM2008和EIGEN-6C2进行精度对比和分析,结果表明,EIGEN-6C2模型垂线偏差子午分量计算精度约为2.07″,卯酉分量计算精度约为2.13″,高程异常计算精度约为0.305m(含系统差),均优于EGM2008模型的计算精度。故在我国范围内,推荐使用EIGEN-6C2模型进行似大地水准面精化以及各类扰动重力场元计算。
Global gravity field model is very important in satellite precise orbit determination,geoid refinement,prospection,climate research,geophysics,physical geology,marine science and many other fields.The research progress of global gravity field model was summarized here.The computation of the disturbing filed elements using gravity filed model was presented briefly,and the efficiency of Legendre computation was compared using different formulae.The precision of EGM2008 and EIGEN-6C2 were compared using real height anomaly and vertical deflection data.Results show that,precision of the horizontal component is about 2.07″,while the vertical component is about 2.13″.The precision of height anomaly is about0.305 m.In conclusion,the EIGEN-6C2 model shows a better precision than EGM2008 in China.As a result,the EIGEN-6C2 is recommended to be used in geoid refinement and other disturbing filed elements computation in China.
作者
张杰
孙文
梅宇庭
范玉磊
ZHANG die;SUN Wen;MEI Yu-ting;FAN Yu-lei(61243 PLA troops,Urumqi Xinjiang 830006,China)
出处
《现代测绘》
2018年第2期40-43,共4页
Modern Surveying and Mapping
基金
国家自然科学基金项目(41404020
41504018)
