Frequency Modulation Nonlinear Correction and Ranging in FMCW LiDAR

IF 2.2 3区工程技术 Q3 ENGINEERING, ELECTRICAL & ELECTRONIC

IEEE Journal of Quantum Electronics Pub Date : 2024-09-05 DOI:10.1109/JQE.2024.3454604

Yuchen Jiang;Miao Hu;Mengmeng Xu;Haozhen Li;Xuefang Zhou;Meihua Bi;Sunqiang Pan;Chong Liu

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Abstract

The linearity of the laser frequency modulation is a crucial factor that affects the performance of the frequency-modulated continuous wave (FMCW) LiDAR ranging. Nonlinearity can influence ranging resolution and introduce errors. This paper proposes a method for correcting frequency modulation nonlinearity based on waveform preprocessing for the modulation signal of the laser. After correction, the residual nonlinearity (1-r2) of the laser is reduced to

$1.85\times 10^{-4}$

for the up-sweeping and

$8.47\times 10^{-4}$

for the down-sweeping using the modulation signal with the repetition frequency of 50 kHz. The full-width at half of the maximum (FWHM) of the spectrum decreases by 86% compared to pre-correction, resulting in the ranging error of 0.37% at the distance of 38 cm. With distances of 0.90 m, 1.80 m, 2.89 m, and 4.13 m, respectively, the ranging error stabilizes at 0.2%, and the minimum deflection of distance can reach

$8~\mathrm {\mu m}$

查看原文本刊更多论文

FMCW 激光雷达中的调频非线性校正与测距

激光频率调制的线性度是影响频率调制连续波（FMCW）激光雷达测距性能的关键因素。非线性会影响测距分辨率并带来误差。本文提出了一种基于激光调制信号波形预处理的频率调制非线性校正方法。经过校正后，使用重复频率为 50 kHz 的调制信号，激光器的残余非线性（1-r2）在上扫时降低到 1.85times 10^{-4}$，在下扫时降低到 8.47times 10^{-4}$。与校正前相比，光谱的最大值一半的全宽（FWHM）减小了 86%，因此在 38 厘米的距离上，测距误差为 0.37%。距离分别为 0.90 米、1.80 米、2.89 米和 4.13 米时，测距误差稳定在 0.2%，距离的最小偏差可达 $8~\mathrm {\mu m}$ 。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

IEEE Journal of Quantum Electronics 工程技术-工程：电子与电气

CiteScore

4.70

自引率

4.00%

发文量

审稿时长

3.0 months

期刊介绍： The IEEE Journal of Quantum Electronics is dedicated to the publication of manuscripts reporting novel experimental or theoretical results in the broad field of the science and technology of quantum electronics. The Journal comprises original contributions, both regular papers and letters, describing significant advances in the understanding of quantum electronics phenomena or the demonstration of new devices, systems, or applications. Manuscripts reporting new developments in systems and applications must emphasize quantum electronics principles or devices. The scope of JQE encompasses the generation, propagation, detection, and application of coherent electromagnetic radiation having wavelengths below one millimeter (i.e., in the submillimeter, infrared, visible, ultraviolet, etc., regions). Whether the focus of a manuscript is a quantum-electronic device or phenomenon, the critical factor in the editorial review of a manuscript is the potential impact of the results presented on continuing research in the field or on advancing the technological base of quantum electronics.