脉冲式激光测距系统中时间测量模块设计与实现  

Design and Implementation of a Time Measurement Module in Pulsed Laser Ranging System

作　　者：王磊[1] 郭唐永[1] Wang Lei;Guo Tangyong(Key Laboratory of Earthquake Geodesy,Institute of Seismology,CEA,Wuhan,Hubei 430071,China)

机构地区：[1]中国地震局地震研究所(地震大地测量重点实验室)

出　　处：《伊犁师范学院学报（自然科学版）》2019年第2期65-71,共7页Journal of Yili Normal University：Natural Science Edition

基　　金：湖北省重大科学仪器设备开发专项(2013BEC053)

摘　　要：在脉冲式激光测距的设计当中,时差测量成了一个影响整个系统测量精度最关键的因素.针对激光测距中时差测量原理,设计了一种基于FPGA的时间测量模块,采用低成本、60 nm低功耗工艺的Cyclone IV系列芯片实现了模块设计,整个模块包括PLL时钟源、待测信号产生电路、计数器、边沿检测电路、延迟链电路、查找表及数据处理.首先介绍了脉冲激光测距原理,然后描述了设计时间测量模块的原理、结构以及各个部分电路的原理与设计,最后测试结果,时差测量精度小于250 ps,满足脉冲式激光测距系统的要求.In the design of a pulsed laser ranging,the time measurement(time of flight measurement)has become a measurement precision of the key factors affecting the whole system.The time measuring principle for laser ranging,the paper has designed a time measurement module based on FPGA and Cyclone IV series chip is used.The whole module system includes the PLL clock source,signal generating circuit,counters,edge detection circuit,delay chain circuit,look-up-table,and data processing.In this paper pulse laser ranging principle is firstly introduced,and then describes the design principle,the system framework and each part of module circuit principle and design.Finally it provides the measured results of module system,the time measuring precision is less than 250 ps,it can meet the requirements of the pulsed laser ranging system.

关 键 词：时差测量 激光测距 现场可编程门阵列 VERILOG HDL 

分 类 号：TN247[电子电信—物理电子学]