【作者】 蒋志浩；

【导师】 白征东； 张鹏；

【作者基本信息】 清华大学 ， 建筑与土木工程， 2009， 硕士

【摘要】 高精度空间基准的建立、维持与更新一直以来是国际上的热点问题。近年来许多国家和地区都在研究和实施地心坐标参考框架的更新和现代化工作。我国于2008年7月1日启用了中国地心坐标系统2000 (CGCS 2000),它由全球导航卫星系统国家级连续运行站网(国家CORS网)和国家高精度大地控制网这两部分组成。本论文以计算所获取的高精度GPS网成果为基础,围绕建立、维持和更新我国地心坐标参考框架为主线,采用地壳运动特征分析和坐标参考框架质量分析的方法,评定了我国地心坐标参考框架的精确性、动态性和可靠性。本论文主要研究内容和成果如下。1.研究了全球地心坐标参考框架和我国CGCS2000坐标参考框架的建立方法,提出了通过建立我国长、短期坐标参考框架来形成我国统一时空基准的思想,指出了国家CORS站的连续观测方式是建立我国动态、高精度地心坐标参考框架的唯一途径。2.对国家CORS网站近10年的连续观测成果和中国大陆高精度GPS网1999年至2007年多期重复观测数据进行了精细处理,获取了中国大陆精度高(坐标精度优于5mm,速度场精度优于2mm/a),范围广(覆盖了中国大陆),观测点数多(1081个点)的实测坐标和速度场值;3.基于GPS站点的实测速度场值,研究了中国大陆现今地壳运动速度场,同时采用Euler矢量法和相似变换法建立了我国地壳运动背景场,并在此基础上建立了我国区域地壳运动模型速度场,进一步研究了我国区域板块运动特征。4、讨论了我国地心坐标参考框架的框架点选取原则。采用了通过框架点坐标时间序列,研究框架点的稳定性和动态性能的方法。5.利用国家CORS站的周解坐标时间序列实现了我国短期框架。通过周解坐标分量重复性对我国坐标长期、短期坐标参考框架的质量进行了分析。6.使用多种分析方法对框架点的坐标分量重复性进行了分析,对坐标时间序列的误差特征进行了研究。利用功率谱分析方法、小波分析方法,对国家CORS站点高程分量周期性特征进行了分析。更多还原

【Abstract】 The definition, renewal and maintenance of geodetic datum have been international hot issues. In recent years, many countries and regions have been studying and implementing in modernization and renewal in local geodetic reference coordinate frame. Our country started CGCS 2000 on July 1st 2008, which was composed of CORS network and national high-precision geodetic control network. In order to estimate the precision, dynamic and reliability of geocentric coordinate framework, this paper is focused on definition, renewal and maintenance of geocentric coordinate framework. The analysis are based on the precise result of CORS and national GPS network, and two analysis methods are adopted: the first one is the crustal movement characteristics, and second one is the quality of coordinates and velocity. The main research works and results are as below.1. This paper studied the establishment methodology of ITRF and CGCS network, the ideas are referred which create unified space-time geodetic datum through the long-term reference frame and short-term reference frame, and the unique methods to obtain the dynamic, high-precision geocentric coordinate framework through the construction of CORS network are referred2. The data of recent 10 years continuous observation results from state CORS network and the data between 1999 and 2007 from the mainland GPS network have been finely processed, the coordinates and velocities of Chinese mainland are obtained, which is the most precise (coordination better than 5mm, velocity better than 2mm / a), Wide area (covering Chinese mainland), and densest (1081 points).3. Crustal movement velocity field and its gradient field are inferred through the GPS-derived velocity field data, and the model of crustal deformation velocity field for the Chinese mainland has been established base on the adoptions of Euler vector model and similar transformation methods, on which, the regional crustal deformation characters of china mainland have been further analyzed.4. This paper summarizes the principle used to choice frame stations of Chinese geocentric coordinate reference frame, and the further studying on stability and dynamical of frame stations have been implementing.5. The short-term frame is realized by the time series which are derived from weekly result of CORS, and the quality is analyzed based on the coordinate time series and coordinate components repeatability which abstained from weekly resolves.6. Multi-resolution is used to analyze the coordinate components repeatability, and the error characters of coordinate time series are investigated. Wavelet analysis and spectral method are implemented to analysis GPS time series in height component generated from CORS network, and indicates that the time series of CORS station has some periodicity, especially the periodicity in the elevation direction.更多还原