A high-precision range extraction method using an FM nonlinear kernel function for DFB-array-based FMCW lidar
A high-precision range extraction method using an FM nonlinear kernel function for DFB-array-based FMCW lidar
复制标题
基于DFB阵列的FMCW激光雷达使用FM非线性核函数的高精度距离提取方法
DOI：
10.1016/j.optcom.2021.127469
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发表时间：
2021-09
影响因子：
2.4
通讯作者：
Guodong Liu
中科院分区：
文献类型：
--
作者：
Cheng Lu;Zehao Yu;Guodong Liu
调频连续波（FMCW）激光雷达是一种高精度的绝对距离测量技术，其分辨率与光源的调频带宽成正比。分布反馈（DFB）阵列具有调频范围宽、线宽窄、调频速度快、成本低等优点，符合FMCW激光雷达的要求。然而，现有的DFB阵列FMCW激光雷达距离提取方法存在信号拼接误差、残留FM非线性、高采样率要求和色散失配等问题。本文提出并实现了一种基于调频非线性核函数的距离提取方法，提高了DFB阵列FMCW激光雷达的测量精度。利用该方法对距离为5m的目标进行了实验测量，获得了1.9 μ m的精度，远优于同等条件下已有的距离提取方法。
Frequency modulated continuous wave (FMCW) lidar is a high-precision absolute distance measurement technology in which the resolution is proportionate to the frequency modulation (FM) bandwidth of the light source. The distributed feedback (DFB) array exhibits advantages that meet FMCW lidar, such as a wide FM range, narrow linewidth, high FM speed, and low cost. However, the existing range extraction method for DFB array-based FMCW lidar has problems such as signal splicing error, residual FM nonlinearity, high sample rate requirement, and dispersion mismatch. Here, we propose and demonstrate an FM nonlinear kernel function-based range extraction method, which improves the measurement precision of DFB array-based FMCW lidar. The distance to a target located at 5 m is experimentally measured using this method, and a precision of 1.9 μ m is obtained, which is much better than the existing range extraction method under the same conditions.
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