Research on Subgrade Settlement Monitoring based on Beidou Navigation System

A real-time high-precision monitoring system and algorithm are proposed and demonstrated for subgrade settlement using Beidou navigation satellite system in this paper. Along with installing monitoring equipment on railway subgrade, the 4G module is introduced to communicate with the continuously operating reference stations (CORS) to acquire differential corrections so as to enhance the positioning accuracy of Beidou receiver. The horizontal and vertical deviation of rail are successfully achieved based on high-precision positioning information and sent to the upper computer for timely warning. While using the Strong Tracking Kalman Filter under abnormal circumstances, e.g. mutational data and weak network signal conditions, the effectiveness and practicability of the monitoring algorithm are evaluated.