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针对传统列车速度测量装置存在量程小、调试复杂等问题,基于扫描激光雷达技术,设计了一套适用于高速列车动态限界测量的列车速度测量系统。将扫描激光雷达固定在距列车10m左右的位置上,根据激光脉冲飞行时间测距原理,沿列车行驶方向对进入扫描范围内的列车车身逐点扫描,获得由测量点组成的车身轮廓信息;通过最小二乘拟合车厢测量点,得到列车行驶轨迹,确定列车行驶方向;采用分段线性差值确定相邻两次测量周期内列车行驶的距离,完成列车速度的测量。结果表明:该测速系统操作方便,量程可达600km/h,测速误差控制在±1.2%以内,可以满足高速列车速度测量需求。
Aiming at the problems of small measuring range and complicated debugging of traditional train speed measuring device, a set of train speed measuring system is designed based on the scanning lidar technology, which is suitable for dynamic limit measurement of high speed trains. According to the principle of laser pulse time of flight, the scanning laser radar is fixedly scanned at a distance of about 10m from the train, scanning the train body entering the scanning range point by point along the traveling direction of the train to obtain the vehicle body contour information formed by the measurement points; Least squares fit the measurement points of the train car, get the train driving track, determine the train driving direction; using the piecewise linear difference to determine the distance between two adjacent measuring cycle train to complete the train speed measurement. The results show that the speed measurement system is easy to operate with a range of up to 600km / h and a speed error within ± 1.2%, which can meet the needs of high speed train speed measurement.