大气与环境光学学报 ›› 2018, Vol. 13 ›› Issue (2): 151-160.

• 光电技术 • 上一篇    

基于FPGA的激光雷达回波信号数据采集卡设计

李新强1,2, 张天舒1, 付毅宾1, 项衍1,2, 刘洋1,2   

  1. (1中国科学院安徽光学精密机械研究所环境光学与技术重点实验室,安徽 合肥 230031; 
    2中国科学技术大学,安徽 合肥 230026)
  • 收稿日期:2017-03-06 修回日期:2017-05-08 出版日期:2018-03-28 发布日期:2018-04-15
  • 通讯作者: 李新强 (1992-), 男, 汉族, 河南省南阳市人,硕士,主要从事激光雷达回波信号采集方面的研究。 E-mail:xqli@aiofm.ac.cn
  • 作者简介:李新强 (1992-), 男, 汉族, 河南省南阳市人,硕士,主要从事激光雷达回波信号采集方面的研究。
  • 基金资助:

    Supported by Young Scientists Fund of the National Natural Science Foundation of China (国家自然科学基金青年科学基金, 41605020), the Major Research plan of the National Natural Science Foundation of China (国家自然科学基金重大研究计划, 91544232)

Design of Data Acquisition Card for Lidar Echo Signal Based on FPGA

LI Xinqiang1,2, ZHANG Tianshu1, FU Yibin1, XIANG Yan1,2, LIU Yang1,2   

  1. (1 Key Laboratory of Environmental Optics and Technology, Anhui Institute of Optics and Fine Mechanics, China Academy of Sciences, Hefei 230031, China; 
    2 University of Science and Technology of China, Hefei 230026, China)
  • Received:2017-03-06 Revised:2017-05-08 Published:2018-03-28 Online:2018-04-15
  • Supported by:

    Supported by Young Scientists Fund of the National Natural Science Foundation of China (国家自然科学基金青年科学基金, 41605020), the Major Research plan of the National Natural Science Foundation of China (国家自然科学基金重大研究计划, 91544232)

摘要:

回波信号数据采集设备是激光雷达系统的关键部分。为了提高信噪比,回波信号数据采集设备应当具有滤波和高速数据累加功能,为了满足不同重复频率激光雷达的探测需求,累加过程的采集深度和累加次数等参数应当是可配置的。使用FPGA作为主控设备,实现了一个采样率为20 MHz,具有滤波和硬件累加功能,且参数可配置的通用回波信号数据采集卡 (DAQ card)。测试结果表明,在不同重复频率的触发信号下,采集卡实现了基本的参数配置功能和累加功能,其信噪比为71.9 dB。与国外某回波信号数据采集设备相比,采集卡在高重复频率激光雷达中具有更远的探测距离和更高的信噪比。

关键词: 激光雷达, FPGA, 模数转换, 数据采集, 累加平均技术

Abstract:

Data acquisition equipment of lidar echo signal is the critical part of lidar system. In order to improve signal-to-noise ratio (SNR), data acquisition equipment should have the function of filtering and high-speed data accumulation. In order to meet the requirement of lidars with different repetition frequency, the parameters such as sampling depth and accumulating time should be reconfigurable. A universal data acquisition card of lidar echo signal (DAQ card) with a sampling rate of 20 MHz and reconfigurable parameters, which has the function of filtering and hardware accumulation, is realized by using FPGA as main control element. The test results show that the DAQ card achieves the basic parameter configuration function and accumulation function under the different repetition rate of the trigger signal, and the SNR is 71.9 dB. Compared with a foreign echo signal acquisition equipment, the DAQ card has longer detection range and higher SNR in high repetition frequency lidar.

Key words: lidar, FPGA, analog-digital conversion, data acquisition, accumulation-average technique

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