激光脉冲测距双阈值时刻判别技术研究  

Research on pulsed laser rangefinding dual-threshold timing discriminating technology

作　　者：徐伟[1] 陈钱[1] 顾国华[1] 何伟基[1] 

机构地区：[1]南京理工大学近程高速目标探测技术国防重点学科实验室,江苏南京210094

出　　处：《激光杂志》2011年第3期30-31,共2页Laser Journal

基　　金：装备预先研究项目(4040508011)

摘　　要：在脉冲式激光测距技术中,回波信号幅度和上升时间变化引起的时间晃动误差是影响激光测距精度的主要因素之一。针对时间晃动误差带来的测距精度低的难题,在分析了时间晃动误差和总结一般时刻判别技术的基础上,设计了由高速比较电路,单稳态脉冲展宽电路、脉冲延时电路和快符合电路组成的双阈值时刻判别电路,并对电路进行了误差分析。与一般的时刻判别电路相比,时间晃动误差大大减小,时刻判别精度得到有效提高。实验结果表明:采用该技术的激光测距机精度达到10cm。Time jitter error affected by changed echo signal amplitude and rise time is one of the main factors of low precision in pulsed laser rangefinding technology.In order to solve the problem of low precision for time jitter error,the dual-threshold timing discriminating circuit consist of high-speed comparator,monostable pulse broaden circuit,pulse delay circuit and fast coincidence circuit was designed,based on analyzing time jitter error and summarizing general timing discriminating techniques.And the circuit errors were analyzed.Compared to general timing discriminating techniques,time jitter error was greatly reduced and the timing discriminating precision was effectively improved.The experimental results show that the pulsed laser rangefinding precision is better than 10cm with the technology.

关 键 词：激光脉冲测距 回波信号 时刻判别 双阈值 时间晃动误差 

分 类 号：TN248.1[电子电信—物理电子学]