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基于游标原理的快速高精度脉冲激光测距方法

A Fast and High-Precision Pulse Laser Ranging Method Based on Cursor Principle

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摘要

提出一种适用于运动目标的快速高精度距离测量方法,通过结合正弦基准时间间隔测量方法与游标时钟控制脉冲发射技术,实现对运动目标的高精度测距。以正弦信号为基准,测量出激光脉冲从测距仪到目标之间的飞行时间,并将其作为估计目标距离的初值;利用游标时钟控制脉冲发射技术,选取正弦信号0点处的线性段作为定时特征点,可以得到高分辨率的测量结果;以该定时特征点对应的游标时刻为脉冲定点发射时刻,通过多脉冲测量取平均值后实现快速高精度测距。实验结果表明:当激光平均功率为1 mW时,在无合作目标的300 m测程内,测距精度为±(3 mm+2×10-6×D)(D为测量距离),测量时间缩短至5 ms。该测量系统具有结构简单、成本低、容易实现等特点。

Abstract

This study proposes a fast and high-precision distance measurement method suitable for moving targets. By combining the sinusoidal reference time interval measurement method with the vernier clock controlled pulse emission technology, this method could achieve high-precision ranging for moving targets. The time-of-flight of a laser pulse from a range finder to a target is used as the initial value of the estimated distance; this value is measured using a sinusoidal signal as a reference. Using the vernier clock controlled pulse emission technology, the high-resolution measurement can be obtained by selecting a linear segment at zero point of the sinusoidal signal as the timing feature point. The high-accuracy ranging can be realized by averaging multi-pulse measurements based on the vernier moment corresponding to the timing feature point as the time of the fixed-point pulse emission. The experimental results show that for an average laser power of 1 mW, the range accuracy is ±(3 mm+2×10-6×D), where D is the measured distance. Moreover, the measurement time is shortened to 5 ms within 300-m ranging without a cooperation target. The proposed system has a simple structure, is inexpensive, and can be easily implemented.

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中图分类号:TN247

DOI:10.3788/cjl201946.0510001

所属栏目:遥感与传感器

收稿日期:2018-12-21

修改稿日期:2019-01-16

网络出版日期:2019-01-28

作者单位    点击查看

黄民双:北京石油化工学院光机电装备技术北京市重点实验室, 北京 102617
关在辉:北京石油化工学院光机电装备技术北京市重点实验室, 北京 102617

联系人作者:黄民双(huangminshuang@bipt.edu.cn)

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引用该论文

Huang Minshuang,Guan Zaihui. A Fast and High-Precision Pulse Laser Ranging Method Based on Cursor Principle[J]. Chinese Journal of Lasers, 2019, 46(5): 0510001

黄民双,关在辉. 基于游标原理的快速高精度脉冲激光测距方法[J]. 中国激光, 2019, 46(5): 0510001

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