设计了一款“FPGA+DSP”架构的高速数据采集系统,可对激光 雷达的多路回波信号进行同步并行采集、数据反演及远程传输。FPGA在同一触发信号激励下,可对输 入的四个通道回波信号进行高速采集、累加、存储；DSP读入四个通道的累加结果,求平均后进行反演, 并以TCP/IP协议实现数据的远程传输。 设计完成的数据采集系统在一台米散射激光雷达系统中进行了测试。结果表明：该系统可对脉冲重 复频率为1kHz的多路回波信号以20 MHZ的频率进行采样,并可对5000次的回波信号进行对应点累计 平均,完全满足激光雷达数据采集的特定要求。本系统具有性价比高、便携、可实现数据的远程 共享,在多光谱激光雷达及高光谱分辨率激光雷达的数据采集中具有推广价值。

A high-speed data acquisition system based on “FPGA+DSP” for echo signal sampling of lidar was proposed. FPGA in the system samples four channels signal simultaneously, cumulates and caches it. DSP reads into data and then average them, after retrieving by a certain algorithm, then transmite to the remote PC by the protocol of TCP/IP. Satisfactory results were obtained when the data acquisition system was applied in a Mie scattering laser radar. Results show that the system can sample the echo signal repeating at 1 kHz by a frequency of 20 MHz, and it can accumulate the corresponding data more than 5000 times, which meet the special features of lidar data acquisiton. The data acquisition system is worth popularizing in the multispectral lidar and the high spectral resolution lidar for features of cost-effective, portable, and can share the data remotely.