高精度高重频脉冲激光测距系统  

High precision and high frequency pulse laser ranging system

作　　者：纪荣祎[1] 赵长明[1] 任学成[1] 

机构地区：[1]北京理工大学光电学院,北京100081

出　　处：《红外与激光工程》2011年第8期1461-1464,共4页Infrared and Laser Engineering

基　　金：国防科技工业技术基础科研项目(J172009C001)

摘　　要：在三维激光扫描探测系统中,激光测距的测量重频和测量精度是影响整个系统性能的关键参数。介绍了三维激光扫描探测系统的工作特点,设计了一种以NiosII嵌入式软处理器为核心的高重频、高精度脉冲激光测距系统。通过分析影响测量重频和测距精度的因素,采用双阈值时刻鉴别方法进行计时起止时刻的鉴别,使用TDC-GP2高精度时间间隔测量芯片进行精密计时,设计了基于NiosII嵌入式软处理器的计时控制系统以提高测量重频。实验结果表明:实现了测量重频为20 000次/s、测距精度为3 cm的激光测距。与传统的单片机控制的计时系统相比,该系统不仅测量重频和测量精度高,且具有更好的可扩展性和灵活性。In three-dimensional （3D） laser scanning detection system, the measurement repetition rate and measurement precision of laser ranging are the key parameters affecting the performance of the whole system. The work characteristics of 3D laser scanning detection system were introduced, and a high repetition rate and high measurement precision pulse laser ranging system based on the Nios II soft-core was designed. According to the analysis of the factors which affected the repetition rate and precision of range measure, the double-threshold time discriminator was adopted to produce timing mark for the starttop time discrimination, and the TDC-GP2 high-precision interval measuring chip was used to achieve high precision on time measure. In addition, the time measure control system based on the Nios II softcore was designed to improve the measurement repetition rate. Experimental results show that the measurement repetition rate of 20 000/s and the ranging precision of _＋3 cm are achieved. Compared with the traditional MCU time measure control system, the designed system owns the advantages of high repetition rate and high measurement precision, furthermore, it is more expandable and flexible.

关 键 词：脉冲激光测距 精密时间测量 三维激光扫描 NIOSII 

分 类 号：TN247[电子电信—物理电子学]