三种重力场模型在高精度动态测量中的适用性分析  

Applicability analysis of three gravity field models in high precision kinematic surveying

作　　者：高士健 高淑照 孙诚彬 李杨 杨林 GAO Shijian;GAO Shuzhao;SUN Chengbin;LI Yang;YANG Lin(Faculty of Geosciences and Environmental Engineering,Southwest Jiaotong University,Chengdu 611756,China;Junan County Branch Center of Linyi Highway Development Center,Linyi,Shandong 276600,China)

机构地区：[1]西南交通大学地球科学与环境工程学院,成都611756 [2]临沂市公路事业发展中心莒南县中心,山东临沂276600

出　　处：《导航定位学报》2023年第1期113-121,共9页Journal of Navigation and Positioning

摘　　要：为了进一步研究重力场模型在工程测量中的适用性,对动态测点GNSS高程转换的精度进行评估:基于某铁路公司实际测量作业,将地球重力场模型2008(EGM2008)、欧洲新技术改进重力场模型6C4(EIGEN-6C4)、实验重力场模型2019e_2159(XGM2019e_2159)3种重力场模型应用在轨道上动态测点的GNSS高程转换中;并采用精度评定指标和多基准站高程互差法、基准站位差互差法进行对比分析。结果表明:1)XGM2019e_2159重力场模型的精度评定指标略优于EGM2008、EIGEN-6C4模型;2)不同模型的多基准站高程互差存在显著差异,2个测段中XGM2019e_2159重力场模型计算的高程互差都能满足限差要求;3)不同模型的基准站位差互差存在较大差异,XGM2019e_2159重力场模型在各测段的基准站位差互差最小。在实际作业中应结合测区选用合适的重力场模型,以保证动态测点的高程转换精度。In order to improve the work efficiency and the reliability of the results,technologies and operation modes such as continuous operation reference station(CORS),global satellite navigation system(GNSS),post-processing kinematic(PPK),etc.have been adopted in the track geometry measurement of existing general speed railway.Due to the uneven distribution of the global gravitational field,it is necessary to evaluate the accuracy of the kinematic survey point GNSS elevation conversion.Based on the actual project of a specified railway corporation,the three gravity field models,Earth gravitational model 2008(EGM2008),European improved gravity model of the Earth by new techniques 6C4(EIGEN-6C4),and the experimental gravity field model 2019e_2159(XGM2019e_2159)were applied to GNSS height conversion of kinematic points on the track.The accuracy evaluation indexes,multi-reference station elevation difference method and reference station potential deviation method were used in the comparison.The results show that the accuracy evaluation indexes of XGM2019e_2159 gravity field model was slightly better than that of EGM2008 and EIGEN-6C4 models.The multi-reference station elevation difference among three models was significant.The elevation difference calculated by XGM2019e_2159 can meet the specification.The reference station potential deviation from different models was obvious.The reference station potential deviation calculated by XGM2019e_2159 gravity field model was the smallest.In practical work,appropriate gravity field model should be selected to ensure the accuracy of height conversion of kinematic points.

关 键 词：地球重力场模型 高程异常 适用性分析 后处理动态 高精度动态测量 

分 类 号：P228[天文地球—大地测量学与测量工程]