脉冲激光测距时间间隔测量技术

Pulsed laser ranging time-interval measuring technique

在脉冲激光测距系统中,为提高时间间隔测量的精度,采用插值法进行时间间隔测量。在分析传统的数字计数法测量原理与误差的基础上,重点研究了插值法。其测量对象针对传统数字计数法中待测脉冲上升沿与下一个量化时钟脉冲上升沿之间的时间间隔。测量采用电容充放电技术,把时间间隔加入到一个时间扩展模块(通常为一只高精度的电容),实现时间上的放大,再对放大后的时间进行测量,可提高时间测量的精度。利用该方法得到的时间间隔测量精度可达到100 ps,对应于1.5 cm的测距精度。

In pulsed laser ranging system,the time interval measurement to improve the accuracy of the interpolation method for time interval measurement.This article analyzes the traditional digital counting method based on the principle and error,focusing on the interpolation.The objects of measurement are the conventional digital counting pulse under test and the next rising edge of a quantitative clock time interval between pulse rising edge.By capacitive discharge technology,the time interval is loaded to a time extension module（usually a high-precision capacitance）to achieve time amplification.Measurement of the enlarged time can improve the precision of time measurement.Using this method,the time interval measurement accuracy is up to 100 ps,corresponding to 1.5 cm range accuracy.