顾及地球重力场模型的城市级区域似大地水准面精化方法研究  

Study on refinement method of urban-level regional quasi-geoid with earth gravity field model

作　　者：肖杰 XIAO Jie(Shanxi Institute of Surveying and Mapping Geographic Information,Taiyuan 030001,China)

机构地区：[1]山西省测绘地理信息院,太原030001

出　　处：《测绘科学》2024年第4期15-22,共8页Science of Surveying and Mapping

基　　金：山西省测绘地理信息院科技资助项目(2021-KK1)。

摘　　要：针对城市级地形复杂的大区域及重力数据收集困难的情况下,单纯使用数学模型无法精细描述似大地水准面的问题,该文提出了顾及地球重力场模型的“移去-恢复”技术拟合似大地水准面的方法。以某地级市实测数据为例,分别采用多面函数法、移动曲面法和顾及EGM2008、EIGEN-6C4地球重力场模型的“移去-恢复”方法拟合似大地水准面,并利用实测GNSS/水准数据和该市已有高精度似大地水准面模型对各种方案计算结果进行对比分析。结果表明:多面函数法精度优于移动曲面模型法;顾及地球重力场模型方法较单纯的函数模型法拟合精度更高;在实验区虽然EIGEN-6C4地球重力场模型较EGM2008地球重力场模型精度略优,但对最终的似大地水准面模型精度提高并不显著。In view of the large regions with complex terrain and difficulties in collecting gravity data in urban areas,a method called"remove-restore"technique that takes into account the earth gravity field model is proposed to accurately describe the geoid surface in this paper.Taking the measured data of a prefecture-level city as an example,the polyhedral function,the moving surface method,and the"remove-restore"method considering the EGM2008 and EIGEN-6C4 earth gravity field models were used to fit the quasi-geoid.The results of various schemes were compared and analyzed using the measured GNSS/level data and the high-precision quasi-geoid model already available in the city.The results show that the accuracy of the polyhedral function method is better than that of the moving surface model method.Considering the higher fitting accuracy of the earth gravity field model methods compared to the simple function model methods;Although the EIGEN-6C4 earth gravity field model has slightly better accuracy than the EGM2008 earth gravity field model in the experimental area,it does not significantly improve the accuracy of the final quasi-geoid model.

关 键 词：似大地水准面 高程异常 GNSS/水准 EGM2008 EIGEN-6C4 多面函数 

分 类 号：P228[天文地球—大地测量学与测量工程]