光子学报, 2012, 41 (8): 967, 网络出版: 2012-08-15
基于FPGA的激光雷达高速数据采集系统设计
Design of a High-speed Data Acquisition System Based on FPGA for Laser Radar
激光雷达 回波信号 高速数据采集 同步状态机 双端口RAM Laser rader Echo signal High-speed data acquisition Synchronous finite state-machine Dual-port RAM
摘要
为了对激光雷达的回波信号进行采集,设计了一款基于FPGA的高速数据采集、预处理系统.该系统以FPGA内嵌DRAM作为存储器,以同步有限状态机作为控制方式,可在1 kHz的外触发信号激励下,以20 MHz的采集频率采集数据,并可在不丢失脉冲的情况下,对采集到的4 096个数据点进行5 000次以上的对应点累加平均(滤除背景噪音).设计完成的数据采集系统已应用于一台米散射激光雷达系统中,达到了30 km探测距离、7.5 m时空分辨率的设计要求.
Abstract
A high-speed data acquisition and preprocessing system was proposed based on FPGA for echo signal sampling of laser radar. By use of embedded DRAM and synchronous finite state-machine, the designed system, triggered by a 1 kHz excitation signal, can sample the signal at the rate of 20 MHz, and the 4 096 sampled data can be accumulated correspondingly more than 5 000 times for the purpose of filtering background noise. The completed system was applied in a Mie scattering laser radar, which can achieve the spatial and temporal resolution of 7.5 meter and the detection range of 30 km.
辛文辉, 李仕春, 华灯鑫, 宋跃辉, 狄慧鸽, 周智荣. 基于FPGA的激光雷达高速数据采集系统设计[J]. 光子学报, 2012, 41(8): 967. XIN Wen-hui, LI Shi-chun, HUA Deng-xin, SONG Yue-hui, DI Hui-ge, ZHOU Zhi-rong. Design of a High-speed Data Acquisition System Based on FPGA for Laser Radar[J]. ACTA PHOTONICA SINICA, 2012, 41(8): 967.