基于激光拍频高准确度相位式测距方法

姜成昊; 杨进华; 张丽娟; 王晓坤

doi:doi:10.3788/gzxb20144309.0912006

光子学报, 2014, 43 (9): 0912006, 网络出版: 2014-10-23

基于激光拍频高准确度相位式测距方法

High-precision Phase-shift Laser Range Finder System Based on Laser Beat-frequency

论文大纲

姜成昊 ^*杨进华张丽娟王晓坤

作者单位

长春理工大学光电工程学院, 长春 130022

摘要

介绍一种基于相位式激光测距的高动态、高准确度测距系统.系统引入光频调制技术实现激光拍频产生高频调制信号并完成信号的高速变测尺调制.在对回波信号进行鉴相时, 为降低鉴相偏差采用无窗全相位谱分析并实现对测量信号的相位计算.计算表明, 该方法可以有效抑制频谱泄露, 减小噪声对测量结果的影响, 提高鉴相准确度.实验表明该测距系统可以有效地解决相位法测距中存在的抗干扰能力差、距离模糊较难抑制等问题, 调制信号频率为100 MHz、信噪比为30 dB时测距准确度优于0.5 mm.

Abstract

A high-dynamic and high-precision ranging system based on laser phase-shift ranging was studied.The optical frequency modulation technology was introduced in system to realize laser beat-frequency, produce high-frequency modulation signals and complete the rapid-change measuring tape modulation of signal.In the phase demodulation of echo signal, the windowless all-phase spectrum analysis was adopted and the phase calculation of measuring signal was realized for the purpose of reducing the phase demodulation deviation.The calculation shows that the proposed method can effectively retrain spectrum leakage, reduce the influence of noise on the measurement results, and improve the phase demodulation precision.The experiment shows that this ranging system can effectively solve the problems such as poor anti-jamming capability and difficult mitigation of range ambiguity in the phase ranging.The ranging precision is more than 0.5 mm when the modulating signal frequency is 100 MHz and SNR is 30 dB.

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姜成昊, 杨进华, 张丽娟, 王晓坤. 基于激光拍频高准确度相位式测距方法[J]. 光子学报, 2014, 43(9): 0912006. JIANG Cheng-hao, YANG Jin-hua, ZHANG Li-juan, WANG Xiao-kun. High-precision Phase-shift Laser Range Finder System Based on Laser Beat-frequency[J]. ACTA PHOTONICA SINICA, 2014, 43(9): 0912006.

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