基于EGM2008模型的高程拟合工程应用研究  

Study of engineering application of elevation fitting based on EGM2008 model

作　　者：李传中 王琮琪 LI Chuanzhong;WANG Congqi(Anhui Survey&Design Institute of Water Resources&Hydropower Co.,Ltd.,Hefei 230000,China;China South-to-North Water Diversion Corporation Limited,Beijing 100038,China)

机构地区：[1]安徽省水利水电勘测设计研究总院有限公司,安徽合肥230000 [2]中国南水北调集团有限公司,北京100038

出　　处：《水利水电快报》2022年第7期57-61,共5页Express Water Resources & Hydropower Information

摘　　要：在GNSS测量中,从大地高转换到正常高需要求取符合精度要求的高程异常值。采用TBC软件选取了丘陵地区和平原地区不同地形类别的GNSS网;在GNSS网平差时,对比一般数学曲面(移动曲面法)和基于EGM96的模型,分析了基于EGM2008模型的高程拟合精度。结果表明:在GNSS水准高程均匀布设测区范围,保持一定的间距并设置检核点,采用TBC软件基于EGM2008模型的GNSS拟合高程能够达到四等高程精度。加入地球重力场模型高程拟合后,丘陵地区拟合高程精度比平原地区提高更显著,EGM2008模型比EGM96的拟合高程精度更好,3种方式对平原地区拟合高程精度的提高不显著。In the GNSS survey,it is necessary to obtain the height anomaly that meets the accuracy requirement in the conversion from geodetic height to normal height.By adopting TBC software and selecting GNSS network of hilly area and plain area,in the adjustment of GNSS network,the elevation fitting accuracy based on EGM2008 model was analyzed by comparing general mathematical curved fitting and EGM96 model.The results showed that the fourth-grade elevation accuracy could be achieved by TBC software based on EGM2008 model on the condition that the GNSS leveling elevation be uniformly laid out in the survey area with a certain distance and checking points.By adding the Earth Gravity Field model,the elevation fitting accuracy would be better improved in the hilly area than in the plain area,and the EGM2008 model was more accurate than EGM96 model;the accuracy of three methods showed no significant improvement for the elevation fitting in plain area.

关 键 词：EGM2008模型 高程拟合 高程异常 大地高 正常高 

分 类 号：P224[天文地球—大地测量学与测量工程]