Frequency Modulation Nonlinear Correction and Ranging in FMCW LiDAR

被引:2
|
作者
Jiang, Yuchen [1 ]
Hu, Miao [1 ]
Xu, Mengmeng [1 ]
Li, Haozhen [1 ]
Zhou, Xuefang [1 ]
Bi, Meihua [1 ]
Pan, Sunqiang [2 ]
Liu, Chong [3 ]
机构
[1] Hangzhou Dianzi Univ, Coll Commun Engn, Hangzhou 310018, Peoples R China
[2] Zhejiang Inst Metrol, Inst Biochem Metrol, Hangzhou 310015, Peoples R China
[3] Zhejiang Univ, Coll Opt Sci & Engn, Hangzhou, Peoples R China
关键词
Frequency modulation; Adaptive optics; Optical modulation; Nonlinear optics; Optical interferometry; Optical fibers; Fiber nonlinear optics; Frequency modulated continuous wave; laser ranging; nonlinear correction; LINEARIZATION; SWEEP;
D O I
10.1109/JQE.2024.3454604
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
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-r(2)) of the laser is reduced to 1.85x10-4 for the up-sweeping and 8.47x10(-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 mu m .
引用
收藏
页数:7
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