采用多源重力场数据提高区域GNSS高程拟合精度  

Improve the Fitting Accuracy of Regional GNSS Elevation by Using Multi-Source Gravity Data

作　　者：丁渃鹏 杨久东 张凌云 DINIG Ruo-peng;YANG Jiu-dong;ZHANG Ling-yun(College of Mining Engineering,North China University of Science and Technology,Tangshan Hebei063210,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2期78-83,共6页Journal of North China University of Science and Technology：Natural Science Edition

基　　金：国家自然科学基金项目(42004075)。

摘　　要：为提高在无实测重力数据下,提高区域GNSS高程拟合精度的问题,提出了一种应用于区域GNSS高程拟合的新方法,即采用多源重力场数据的多元回归模型法,该方法通过使用地球重力场模型XGM2019e_2159(X Gravity Models2019e_2159)、EIGEN-6C4和EGM96(Earth Gravity Models96)作为多源重力场的模型选择,计算高程异常长波部分、重力异常和扰动重力,根据不同地球重力场模型的高程异常长波部分之间的标准差的大小,建立只包含高程异常长波部分或包含重力异常与扰动重力的多元回归模型。该方法与广泛使用的"移去-拟合-恢复"法的拟合结果进行了精度对比。研究结果表明,在三个研究区内,该方法的外符合精度相比采用XGM2019e_2159模型的"移去-拟合-恢复"法,最大约有3厘米的提升,最小有毫米级提升。因此可验证该方法在提高区域GNSS高程拟合精度的可行性,为提高GNSS高程拟合精度提供了可行的新方案。In order to improve the accuracy of regional GNSS elevation fitting without measured gravity data,a new method for regional GNSS elevation fitting is proposed,that is,the multiple regression model method using multi-source gravity field data.This method uses the earth gravity field model XGM2019e_2159(X Gravity Models 2019e_2159)、EIGEN-6C4 and EGM96(Earth Gravity Models 96)as the model selection of multi-source gravity field.According to the Bruns formula,the long wave part of elevation anomaly,gravity anomaly and disturbance gravity are calculated.According to the numerical value of the standard deviation between the long wave parts of different elevation anomalies,the multiple regression model of whether the gravity anomaly and the disturbance gravity are included is constructed.This method also compares the accuracy of the fitting results of the widely used'Remove-Fit-Restore'method.The results show that in the three study areas,the external coincidence accuracy of the method is compared with the'Remove-Fit-Restore'method using the XGM2019e_2159 model,with a maximum increase of 2.8 cm and a minimum increase of millimeters.Therefore,the feasibility of this method in improving the accuracy of regional GNSS elevation fitting can be verified,which provides a feasible new scheme for improving the accuracy of GNSS elevation fitting.

关 键 词："移去-拟合-恢复"法 区域GNSS高程拟合 多元回归 GNSS水准高程 高程异常 

分 类 号：P228[天文地球—大地测量学与测量工程]