基于2000国家大地坐标系的中国大陆速度场模型建立方法研究

发布时间：2018-05-10 19:48

本文选题：2000国家大地坐标系 + 速度场模型　；参考：《长安大学》2013年硕士论文

【摘要】：我国2000国家大地坐标系（CGCS2000）已于2008年7月1日正式启用。由于CGCS2000框架点没有点位速度场信息，无法反映我国地壳水平运动年变化量，所以不能完整表述我国地心坐标参考框架的动态性和现势性，也不能满足广大用户高精度定位的需要。随着我国GPS连续运行站点数量的快速增加，，以及大地测量和地球动力学等学科对基础地理信息需求的日益增长，建立我国大陆高精度速度场模型已势在必行。为此，有必要对基于2000国家大地坐标系的中国大陆速度场模型建立方法进行研究和探讨。本文在介绍地心坐标系、国际地球参考系统及框架的基础上，详细研究了基于CGCS2000坐标系的中国大陆速度场数据的获取、模型建立方法等一系列问题，取得的研究进展和成果主要有：（1）实现了GPS数据处理成果在不同ITRF参考框架及不同历元下的转换，为今后数据处理成果归算到我国统一的地心坐标系-CGCS2000提供了解决方案。（2）以高精度GPS数据处理软件GAMIT/GLOBK为计算平台，利用2000年-2010年国家GPS连续运行站及国际IGS站的大量重复观测数据，详细介绍了中国大陆速度场数据的获取与处理方法，并与中国地壳运动观测网络重合点进行分析比较，证明了计算结果的可靠性。（3）利用该方法获得的高精度点位成果及速度场数据（速度场值N方向精度优于±1.6mm/yr，E方向精度优于±1.8mm/yr），研究了近十年来国家GPS连续运行站的变化趋势及变化量，初步获得了各个站点的运动趋势。（4）将中国大陆简易划分成东北、华北、华南、青藏、西北5个块体，基于克里金插值法、最小二乘配置法、最小二乘配置移动拟合推估法三种方法及速度场数据研究了中国大陆速度场模型建立方法，并利用外检点分析了不同的建模方法在不同的块体建立速度场的精度情况，得出了初步结论：最小二乘配置法在大部分块体（华北、华南、东北块体）的拟合精度都较高，表现稳定；克里金插值法在青藏、华北块体的拟合精度较高；最小二乘配置移动拟合推估法在各个块体中的表现不如其他方法理想。最终利用克里金插值法与最小二乘配置法获取了中国大陆1o×1o格网中心点速度场成果，成果差异较小。
[Abstract]:The 2000 National Geodetic coordinate system (CGCS2000) was officially launched on July 1, 2008. Because the CGCS2000 frame points do not have the information of point velocity field and can not reflect the annual variation of crustal horizontal movement in China, the dynamic and present characteristics of the reference frame of geocentric coordinates in China can not be fully expressed. Also can not meet the vast number of users high-precision positioning needs. With the rapid increase of the number of GPS continuous operation stations in China and the increasing demand for basic geographic information in geodesy and geodynamics, it is imperative to establish a high precision velocity field model in China. Therefore, it is necessary to study and discuss the method of establishing Chinese continental velocity field model based on 2000 national geodetic coordinate system. Based on the introduction of the geocentric coordinate system, the international earth reference system and the frame, this paper studies in detail a series of problems, such as the acquisition of the velocity field data of the Chinese mainland based on the CGCS2000 coordinate system, the method of establishing the model, and so on. The main research developments and results achieved are: 1) the conversion of GPS data processing results under different ITRF reference frames and different epochs is realized, which provides a solution for the future data processing results to be calculated to the unified geocentric coordinate system -CGCS2000 in China. Based on the high precision GPS data processing software GAMIT/GLOBK, the acquisition and processing methods of velocity field data in mainland China are introduced in detail by using a large number of repeated observation data from the national GPS continuous operation station and the international IGS station from 2000 to 2010. Compared with the coincidence point of crustal movement observation network in China, the reliability of the calculation results is proved. (3) using the high accuracy point results and velocity field data obtained by this method (the accuracy of N direction of velocity field is better than 卤1.6 mm / y ~ (r) E direction is better than 卤1.8 mm / y ~ (rn), the variation trend and quantity of GPS continuous operation station in China in recent ten years have been studied. Initial access to the movement of each site trend. The Chinese mainland is easily divided into five blocks: northeast, South China, Qinghai-Tibet and Northwest, based on the Kriging interpolation method and the least Square collocation method. Three methods of least square collocation moving fitting and estimation method and velocity field data are studied in this paper. The method of establishing velocity field model in Chinese mainland is studied. The accuracy of different modeling methods in different blocks is analyzed by using external points. The results show that the least square collocation method has high fitting accuracy and stable performance in most blocks (North China, South China and Northeast China), and Kriging interpolation method has higher fitting accuracy in Qinghai-Tibet and North China blocks. The least square collocation moving fitting estimation method is not as good as other methods in each block. Finally, the Kriging interpolation method and the least square collocation method are used to obtain the velocity field of the central point of the 1o 脳 1o grid in the mainland of China, and the difference between the results is small.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：P22;P542

【引证文献】