Development of Spatio-temporal Calibration System for Higher Speed Comprehensive Detection Trains
Aiming at the problems of unstable time synchronization delay and insufficient mileage calibration accuracy in the existing high-speed comprehensive detection train spatio-temporal calibration system,a high-precision spatio-temporal calibration system is proposed.In terms of time calibration,the system uses GNSS time information for the main clock timing and high-frequency crystal oscillator to achieve nanosecond time retention,and designs a distributed multi-node time precise synchronization strategy based on the PTP precise time protocol.In terms of mileage calibration,the self-accumulation of train mileage is realized based on the axle-type photoelectric encoder,and the mileage calibration is realized by comprehensively using inertial combined mileage positioning,RFID radio frequency mileage tag,point-type transponder mileage information and LKJ train running mileage information.A time stamp is attached to the mileage location,after the mileage calibration information is published via Ethernet.The experimental results show that the system can achieve precise nanosecond-level time synchronization and centimeter-level mileage calibration,and the calibration frequency of the system can reach up to 1 250 Hz,which can effectively meet the application requirements of higher speed comprehensive inspection trains.
NETL
NSTL
万方数据
维普
