基于超高阶地球重力场模型的GNSS高程转化方法  

GNSS height conversion method based on ultra-high order earth gravitational model

作　　者：赵保成 徐健 徐坚[1,2] ZHAO Baocheng;XU Jian;XU Jian(Spatial Information Technology Application Department,Yangtze River Scientific Research Institute,Wuhan 430010,China;Wuhan Center for Intelligent Drainage Engineering Technology Research,Wuhan 430010,China)

机构地区：[1]长江科学院空间信息技术应用研究所,武汉430010 [2]武汉市智慧流域工程技术研究中心,武汉430010

出　　处：《全球定位系统》2023年第1期51-56,共6页Gnss World of China

基　　金：国家重点研发专项(2018YFD1100450);长江科学院(CKSF2019410+KJ,CKSF201941+KJ,CKSF2019528/KJ);湖北省自然资源厅科技计划项目(ZRZY2021KJ10)。

摘　　要：为了将全球卫星导航系统(GNSS)得到的大地高直接应用于工程建设中,需要将大地高转换为正常高,基于5种超高阶地球重力场模型结合改进的“移去-拟合-恢复”法开展了GNSS高程转换方法研究,对实验结果的对比分析表明:在实验测区内,利用SGG-UGM-2地球重力场模型直接计算得出的高程异常值与真实高程异常的符合程度更高,中误差为±0.009 3 m.当采用“移去-拟合-恢复法”后,利用XGM2019e_2159地球重力场模型的高程异常拟合效果更优,中误差、极差、偏度值与峰度值最小,分别为±4.786 6 mm、18.875 7 mm、-0.648 8、0.887 8.To make the ellipsoidal height obtained by Global Navigation Satellite System(GNSS)directly applied to engineering construction, it was necessary to convert the ellipsoidal height to normal height. This paper researched the GNSS height conversion method based on 5 ultra-high-order earth gravity field models combined with the improved “removal fitting recovery method”. The comparative analysis of the experimental results showed that in the experimental survey area, the height anomaly directly calculated by SGG-UGM-2 earth gravity field model was more consistent with the real height anomaly, and the mean square error was ± 0.009 3 m. When the “removal fitting recovery method” was adopted, the fitting effect of the height anomaly using XGM2019e_2159 earth gravity field model was better, and the mean square error,range, skewness value, and kurtosis value were the smallest, which were ±4.786 6 mm, 18.875 7 mm,-0.648 8 and 0.887 8.

关 键 词：大地高 正常高 重力场模型 拟合 中误差 

分 类 号：P228.4[天文地球—大地测量学与测量工程]