基于北斗高精度定位系统的大跨度斜拉桥平面坐标实时预测法  

Real Time Prediction Method for Plane Coordinates of Large-span Cable-stayed Bridges Based on Beidou High-precision Positioning System

作　　者：袁达 YUAN Da(China Railway Design Corporation,Tianjin 300251,China)

机构地区：[1]中国铁路设计集团有限公司,天津300251

出　　处：《铁道勘察》2024年第5期8-13,共6页Railway Investigation and Surveying

基　　金：中国铁路设计集团有限公司科技开发项目重点课题(2021A240504,2023A0240103)。

摘　　要：大跨度斜拉桥在受到外界条件影响时,易造成桥梁上加密CPⅡ、CPⅢ平面坐标发生变化。为解决该问题,采用一种基于北斗高精度定位系统的坐标实时预测的方法,首先将大跨度斜拉桥上的加密CPⅡ设置成带有棱镜的北斗高精度定天线,通过该定位天线不仅能实时测量加密CPⅡ坐标,而且天线下的棱镜可与CPⅢ进行联测;然后通过桥梁上加密CPⅡ的实时坐标与首期坐标,利用四参数变换求解实时转换参数;CPⅢ实时坐标可通过实时转换参数计算获得。通过比较某大跨斜拉桥CPⅢ连续4期的实测成果与计算成果,X方向最大较差值为3.0 mm,最小较差值为-3.0 mm,Y方向最大值较差为2.9 mm,最小较差值为-3.0 mm,满足《高速铁路工程测量规范》的要求。研究结果表明,CPⅢ坐标实时预测方法可行,适用于高速铁路大跨斜拉桥CPⅢ实时坐标预测,为轨道工程施工提供一种新方法。When a large-span cable-stayed bridge is affected by external conditions,it is easy to cause changes in the plane coordinates of the encrypted CPⅡand CPⅢon the bridge.To solve this problem,a real-time coordinate prediction method based on the Beidou high-precision positioning system was adopted.Firstly,the encrypted CPⅡon the large-span cable-stayed bridge was set as a Beidou high-precision fixed antenna with a prism.This positioning antenna could measure the encrypted CPⅡcoordinates in real time and connect the prism under the antenna with CPⅢfor measurement.The real-time coordinates of CPⅡand the first phase coordinates were encrypted on the bridge,and the real-time conversion parameters were solved using four parameter transformation.The real-time coordinates of CPⅢwere obtained through real-time conversion parameter calculation.By comparing the measured and calculated results of a large-span cablestayed bridge CPⅢfor four consecutive periods,the maximum difference value in the X direction is 3.0 mm,the minimum difference value is-3.0 mm,and the maximum difference value in the Y direction is 2.9 mm,and the minimum difference value is-3.0 mm,which meets the requirements of the Code for Engineering Survey of High-speed Railway.The research results indicate that the real-time coordinate prediction method for CPⅢis feasible and suitable for real-time coordinate prediction of high-speed railway large-span cable-stayed bridges,providing a new method for track engineering construction.

关 键 词：高速铁路 北斗定位 大跨度斜拉桥 CPⅡ CPⅢ 四参数坐标转换 

分 类 号：U238[交通运输工程—道路与铁道工程] P221[天文地球—大地测量学与测量工程]