高铁CPIGPS网复测数据处理及控制点稳定性分析

GPS repetition survey data processing and stablility analysis for High-speed rail CPI networkand control points

以新建合肥至福州铁路安徽段HFZQ-8标CPI GPS复测数据为基础,介绍了高铁客运专线首级施工控制网CPI平面复测技术和方法,并采用严密平差方法对其采集的GPS原始数据进行平差处理,获取各控制点的3维约束平差坐标,求出转换到相应的中央子午线和投影面大地高坐标系统中的二维坐标,与设计单位提供的平面坐标成果比对,比较其绝对坐标差和相邻点间坐标差之差的相对精度两项参数,对测区所有CPI控制点进行稳定性分析,得出复测结论与成果使用说明.确保了平面复测精度及工程质量,对类似工程项目具有较高的参考价值.

Based on the CPI＇s repetition measurement GPS data built in Hefei to Fuzhou high-speed railway section （HFZQ-8）,the survey technology and methods for level construction control network （CPI） plane are mainly introduced. The acquired GPS original data of CPI are adjusted and processed by using the strict adjust- ment method, and every point of three dimension coordinates constraint adjustment results are calculated. The points are converted into the independent two-dimensional coordinate systems belong to the corresponding cen- tral meridian and geodetic height of a project surface. Then these coordinates and the plane coordinates offered by the design unit are compared, and two parameters of their absolute coordinates differences and the relative precision of the coordinate differences among adjacent point coordinates are analyzed. Finally, the stability of all CPI are analyzed and discussed, the conclusion of the repetition survey results and work instructions are drawn so as to ensure the plane survey precision and quality of projects to be correct. The research results have high reference value for similar projects.