城市轨道交通框架网下的线路GPS控制网与交叉线路控制点的精度分析

Accuracy analysis of line GPS control network and cross line control points under urban rail transit frame network

以昆明地铁4号线控制网为研究对象,根据控制网中的先建线路、后建线路、不同坐标系统及不同换乘类型车站中共用GPS控制点情况,选取各共用控制点同期复测(或原测)成果,采用点位中误差法及坐标对比法分析交叉线路共用GPS点的精度,总结在实际建设过程中统一的城市轨道交通框架网对地铁线路控制网与相邻线路交叉区域共用GPS点的精度影响。

Taking the control network of Kunming Metro Line 4 as the research object,according to the shared GPS control.points in the control network's pre-built lines,post-built lines,different coordinate systems and stations of different transfer types,each common control point is selected for retesting at the same time(or original measurement)results,the accuracy of GPS points shared by crossing lines is analyzed using the error method of points and the comparison method of coordinates,summarize the influence of the unified urban rail transit frame network on the accuracy of the GPS points shared by the subway line control network and the adjacent line intersection area during the actual construction process.