XGM2019模型在似大地水准面精化中的应用  

Application of XGM2019 Model in Refinement of Quasi-geoid

作　　者：丁渃鹏 杨久东 张凌云 Ding Ruo-peng;YANG Jiu-dong;Zhang Ling-yun(College of Mining Engineering,North China University of Science and Technology,Tangshan Hebei 063210,China)

机构地区：[1]华北理工大学矿业工程学院,河北唐山063210

出　　处：《华北理工大学学报（自然科学版）》2024年第1期59-65,共7页Journal of North China University of Science and Technology：Natural Science Edition

基　　金：国家青年科学基金项目(42004075)。

摘　　要：为了对即将发布的新一代全球重力场模型EGM2020(Earth Gravitational Model 2020)在似大地水准面精化上的提升进行评估,通过其试验版的全球重力场模型XGM2019(X Gravitational Model 2019)利用扰动位配合布隆斯公式计算出高程异常的长波项,以评估XGM2019(Earth Gravitational Model 2008)相较于EGM2008(Earth Gravitational Model 2008)在直接转换为正常高精度上的提升;利用"移去-恢复-拟合"法以及顾及由地形起伏变化引起高程异常的短波波分,通过内符合精度和外符合精度来对比其在似大地水准面精度上的提升。以河南省平顶山市某区域的实测数据为例验证了该模型和方法的GPS高程拟合精度。结果表明,在研究区域内使用XGM2019模型在计算高程异常长波精度上相比EGM2008有近1倍的提高,在应用"移去-拟合-恢复"法后两种模型的计算结果比较相近。In order to evaluate the improvement of the new generation of global gravity field model EGM2020(Earth Gravitational Model 2020) in quasi-geoid refinement.By using the perturbation potential of XGM2019(X Gravity Model 2019) and Bruns formula,the long-wave term of elevation anomaly was calculated so as to evaluate the improvement of XGM2019(X Gravity Model 2019) compared with EGM2008(Earth Gravitational Model 2008) in direct conversion to normal high precision.The move-fitting-recovery method and the short-wave wave division considering the elevation anomaly caused by topographic fluctuation were used to compare the improvement of quasi-geoid refinement through internal coincidence accuracy and external coincidence accuracy.The GPS elevation fitting accuracy of the model and method was verified by the measured data of a certain area in Pingdingshan City of Henan Province.The results show that the coincidence degree of quasi-geoid under XGM2019 model is better than that of EGM2008 in the study area.

关 键 词：XGM2019 "移去-拟合-恢复"法 高程拟合 高程异常 

分 类 号：P228.4[天文地球—大地测量学与测量工程]