摘要
针对使用单纯数学模型在进行GNSS高程拟合过程中,只能体现测区高程异常的大致趋势,无法表现出细节变化,进而影响GNSS高程转换精度的问题。提出了地球重力场模型与数学函数相结合的"移去-拟合-恢复"GNSS高程转换方法,以安徽省淮南市某矿工作面走向线为例,分别采用单纯数学模型和顾及EIGEN-6C4、EIGEN-6C2、EGM2008地球重力场模型的"移去-拟合-恢复"法进行了高程转换研究,并将各种高程转换的结果进行了对比分析。结果表明,多面函数相对二次曲面的转换精度较好,顾及地球重力场模型的"移去-拟合-恢复"法较单纯数学模型的高程转换精度有了大幅度的提高;顾及EIGEN-6C4地球重力场模型的GNSS高程转换精度,优于顾及EIGEN-6C2地球重力场模型的转换精度,优于顾及EGM2008地球重力场模型的转换精度。
In the process of GNSS elevation fitting with purely mathematical model,only the general trend of elevation anomaly in the survey area can be shown,the detail change can’t be shown,thus affecting the accuracy of GNSS elevation transformation.In this paper,we propose a“remove-fit-recover” GNSS elevation transformation method combining the Earth’s gravitational field model with the mathematical function.Taking the strike line of a mining face in Huainan ciry,Anhui Province as an example,the mathematical model and the “Alt-Fitting-Resuming”method which take EIGEN-6C4, EIGEN-6C2and EGM2008models into account Elevation transfer study,a variety of elevation conversion results also were compared.The results show that the conversion accuracy of multi-facial function relative to quadratic surface is better,and the accuracy of the“Alt-Fitting-Resuming”method of Earth Gravity Field model is greatly improved compared with pure mathematical model.The GNSS elevation conversion accuracy of the considering EIGEN-6C4earth gravity model,it is better than that of the considering EIGEN-6C2 earth gravity model, which is superior to the earth gravity field model of considering EGM2008.
作者
贾雪
徐炜
刘超
赵兴旺
余学祥
JIA Xue;XU Wei;LIU Chao;ZHAO Xingwang;YU Xuexiang(School of Geodesy and Geomatics,Anhui University of Science and Technology,Huainan,Anhui 232001,China)
出处
《测绘科学》
CSCD
北大核心
2019年第5期14-20,共7页
Science of Surveying and Mapping
基金
国家自然科学基金项目(41404004
41404026
41704008)
安徽理工大学科研启动基金资助项目(11152)
