在以正弦波为测量基准信号的激光脉冲飞行时间测距系统中, 由于高频信号之间的串扰或器件非线性等因素的影响, 将产生脉冲飞行时间周期误差, 导致测距精度降低。为此提出了一种利用测距仪在一定距离条件下的测量数据计算定时误差的方法, 通过最小二乘法拟合构造出一条含误差补偿功能曲线, 并将该曲线进行离散化处理, 将离散化数据存入单片机内, 在距离测量时以含误差补偿功能曲线作为测量基准, 实现对脉冲飞行时间周期误差的补偿。该方法具有原理简单、数据可靠、操作方便等优点。所研制的激光脉冲测距仪经过误差补偿后, 测距误差小于±3 mm。

In the high precision pulse laser ranging system based on sine wave, due to the factor of high frequency signal crosstalk, or electronic and optical devices with nonlinear and other factors, which would cause pulse time-of-flight periodic error, the range accuracy is reduced. The method of calculating the timing error by using the measuring data of the range finder in a certain distance was presented. An error compensation function curve was constructed by least square fitting, this curve was discretized in a sinusoidal reference period, the discrete data was stored into the single chip. In the distance measurement, the error compensation function curve was used as the reference, the compensation of pulsed time-of-flight periodic error was realized. The method had the advantages of simple principle, reliable data, convenient operation and so on. After the error compensation of the laser pulse measurement, the distance error is within ±3 mm.