基于TDC的激光测距传感器飞行时间测量研究

摘要

Laser ranging sensor measure the distance between sensor and target by calculating the flight time of laser pulse. So the precision of laser time interval is a basic beacon to measure the capability of the sensor. A special time-digital-converter chip is used to develop a high resolution time interval measurement module. The principle of the laser ranging of TDC-GP2 is introduced,and the software and hardware realization are presented as well. The test results show that the module has high measurement frequence. The time measurement precision of single pulse is less than 100 ps with good linearity, which can satisfy the requirements of speed measurement and precision in different applications.%激光测距传感器是通过测量传感器与目标之间激光脉冲往返飞行时间来获取待测距离值的,因此激光飞行时间的测量精度是衡量传感器性能的根本指标.采用一种专用的时间数字转换芯片TDC-GP2设计了高精度时间间隔测量模块,介绍了TDC-GP2的测时原理,给出了软硬件的实现方法.实验结果表明:该模块测量频率快,单脉冲测量精度可达100 ps以内,线性度良好,可满足不同应用中的测速和精度要求.