Real Time Prediction Method for Plane Coordinates of Large-span Cable-stayed Bridges Based on Beidou High-precision Positioning System
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 CPⅡ and CPⅢ on 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 CPⅡ on 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 CPⅡ coordinates in real time and connect the prism under the antenna with CPⅢ for measurement.The real-time coordinates of CPⅡ and 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 CPⅢ were obtained through real-time conversion parameter calculation.By comparing the measured and calculated results of a large-span cable-stayed bridge CPⅢ for 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 CPⅢ is 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.
NETL
NSTL
万方数据
