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三角波调制在激光测距中的应用研究

Triangular-Wave Modulation in a Laser Ranging System

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摘要

提出了一种基于最小二乘拟合的三角波调幅激光测距方法,设计了具有光程差的参考信号和测量信号两路信道,采用改进的最小二乘直线拟合算法对两路回波信号进行拟合,得到了关于三角波的拟合参数和奇异特征点;根据两路信号特征点所携带的时移信息之间的关系,可用所提方法进行测距。在10 kHz三角波调制频率的实验条件下,采用几何理论计算得出所提测距方法在测量距离为10 m时的平均测量精度能达到3.2 mm。实验结果证明了该测距方法的有效性,在短距离激光测距方面具有一定的应用前景。

Abstract

In this study, a novel least-squares-based method is proposed to measure the distance using a triangular-wave amplitude modulation laser. Further, we designed two channels comprising a reference signal and a measured signal that exhibit an optical path difference. Their return signals were fitted using the improved least-squares-based straight-line fitting algorithm, and a series of fitting parameters and singular characteristic points were obtained for the triangular-wave. Subsequently, we estimated the detection distance using the proposed theoretical algorithm based on the relation of the time shift information associated with the characteristic points of two signals. The average measurement error associated with this laser ranging system is 3.2 mm at a 10-m measurement range in case of a triangular-wave modulation frequency of 10 kHz, demonstrating the reliability of the proposed method. Furthermore, the proposed method exhibits certain application potential with respect to short-scale laser ranging.

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补充资料

中图分类号:O436

DOI:10.3788/CJL202047.0304006

所属栏目:测量与计量

基金项目:中国铁路总公司系统性重大项目科技研究开发计划;

收稿日期:2019-08-19

修改稿日期:2019-10-17

网络出版日期:2020-03-01

作者单位    点击查看

傅勤毅:中南大学交通运输工程学院, 湖南 长沙 410012
周遵梅:中南大学交通运输工程学院, 湖南 长沙 410012
金鼎沸:中南大学交通运输工程学院, 湖南 长沙 410012
王鸿飞:中南大学交通运输工程学院, 湖南 长沙 410012

联系人作者:周遵梅(zmzhou@csu.edu.cn); 金鼎沸(dr.kin@csu.edu.cn);

备注:中国铁路总公司系统性重大项目科技研究开发计划;

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引用该论文

Fu Qinyi,Zhou Zunmei,Jin Dingfei,Wang Hongfei. Triangular-Wave Modulation in a Laser Ranging System[J]. Chinese Journal of Lasers, 2020, 47(3): 0304006

傅勤毅,周遵梅,金鼎沸,王鸿飞. 三角波调制在激光测距中的应用研究[J]. 中国激光, 2020, 47(3): 0304006

被引情况

【1】李淼成,杨岳,易兵,刘龙. RC-IRLSCF方法及服役车轮踏面线激光检测应用. 中国激光, 2020, 47(9): 904005--1

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