调频连续波激光雷达光源非线性校正技术(特邀)  

Nonlinearity Correction Technology for Light Source of Frequency-Modulated Continuous-Wave Light Detection and Ranging(Invited)

作　　者：谈宜东[1] 林晨啸 Tan Yidong;Lin Chenxiao(State Key Laboratory of Precision Measurement Technology and Instruments,Department of Precision Instruments,Tsinghua University,Beijing 100084,China)

机构地区：[1]清华大学精密仪器系精密测试技术及仪器国家重点实验室,北京100084

出　　处：《激光与光电子学进展》2024年第3期285-294,共10页Laser & Optoelectronics Progress

基　　金：国家重点研发计划(2020YFC2200204,2020YFC2200101)。

摘　　要：调频连续波(FMCW)激光雷达具有非接触式测量、抗环境光干扰、高分辨率、能够同时获取速度和距离信息等优势,近年来被广泛应用于航空航天、精密制造、无人驾驶等领域。FMCW激光雷达的测距能力很大程度依赖于其光源的扫频线性度。在实际应用中,扫频光源会受到诸如应力拉伸不均匀、腔内温度变化、电路噪声等因素的影响,导致扫频非线性的产生,使得测距分辨率和精度下降。针对这一问题,本文从原理出发,分析了FMCW激光雷达中光源扫频非线性的影响,系统介绍了不同类型扫频非线性校正技术的原理和国内外研究进展,并对这些方法的适用场景、特性和优缺点进行总结,为后续相关研究提供启发。Frequency-modulated continuous-wave(FMCW)light detection and ranging(LiDAR)has the advantages of noncontact measurements,resistance to ambient light interference,high resolution,and the ability to simultaneously determine speed and distance information.In recent years,it has been widely used in various fields,including aerospace,precision manufacturing,and autonomous driving.The ranging performance of FMCW LiDAR significantly depends on the sweep linearity of its light source,which is typically influenced by several factors,such as uneven stress stretching,temperature variations,and circuit noise.These factors decrease the ranging resolution and accuracy.The influence of light source nonlinearity in FMCW LiDAR is analyzed theoretically,and research progress in different types of nonlinearity correction techniques is presented.The characteristics,advantages,and disadvantages of each method are summarized to provide a reference for future research.

关 键 词：调频连续波 激光雷达 绝对测距 扫频光源 非线性校正 

分 类 号：O436[机械工程—光学工程]