基于GNSS实时数据流的载波相位差分测速方法及精度评估

Time-differenced Carrier Phase velocity measurement method and accuracy evaluation based on GNSS real-time data stream

为了满足地质灾害实时高精度监测应用需求,对常规全球卫星导航系统(GNSS)载波相位差分测速事后处理软件进行改进,增加了实时数据流接收和实时解码国际海运事业无线电技术委员会(RTCM)的功能,实现了真正的GNSS载波相位差分测速.利用静态站和振动台模拟正弦波振动实验的GNSS数据,评估改进后GNSS实时测速程序的精度.静态模拟动态的测速精度误差均方根(RMS)优于5 mm/s;振动台动态实验解算结果与振动台输出真值的互差RMS为10.4 mm/s.说明本实验的实时GNSS测速程序在静态实时测速条件下的测速精度可达到mm/s级,在实时动态条件下测速精度仍能达到cm/s级.

In order to meet the real-time and accurate monitoring and early warning of geological disasters,and in view of the fact that the traditional GNSS carrier phase difference speed measurement mainly adopts the post-event simulation real-time processing mode,the post-event GNSS carrier phase difference speed measurement program is improved.Added the function of real-time data stream reception and real-time decoding of the RTCM to meet the needs of real-time speed measurement.Use the static station experiment and the shaking table to simulate the sine wave vibration experiment to evaluate the accuracy of the improved GNSS real-time speed measurement program.The root mean square(RMS)of the error in NEU directions in the static experiment is better than 5 mm/s;the RMS difference between the calculated speed in NEU directions and the true value in the dynamic experiment is 10.4 mm/s.It shows that the speed measurement accuracy of the real-time GNSS speed measurement program in this experiment can reach millimeter level under static real-time speed measurement conditions,and the speed measurement accuracy can still reach centimeter level under real-time dynamic conditions.