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

作　　者：辛文辉[1] 李仕春[1] 华灯鑫[1] 宋跃辉[1] 狄慧鸽[1] 周智荣[1] 

机构地区：[1]西安理工大学机械与精密仪器工程学院,西安710048

出　　处：《光子学报》2012年第8期967-971,共5页Acta Photonica Sinica

基　　金：国家自然科学基金(No.41027004)科学仪器基础研究专项;教育部博士学科点专项基金(博导类)(No.20106118110005)资助

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1kHz的外触发信号激励下,以20MHz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30km探测距离、7.5m时空分辨率的设计要求.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 1kHz excitation signal,can sample the signal at the rate of 20MHz,and the 4 096sampled data can be accumulated correspondingly more than 5 000times 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 7.5meter and the detection range of 30km.

关 键 词：激光雷达 回波信号 高速数据采集 同步状态机 双端口RAM 

分 类 号：TN95[电子电信—信号与信息处理]