Abstract: A high-speed data acquisition system based on “FPGA+DSP” for echo signal sampling of lidar was proposed in this paper. FPGA in the system samples four channels signal simultaneously, cumulate and cache it. DSP read into data and then average it, after retrieving by a certain algorithm ,then result ware transmited to the remote PC by the protocol of TCP/IP. Satisfactory results was obtained when the data acquisition system is applied in a Mie scattering laser radar, it shown the system can sample the echo signal repeating at 1KHz by a frequency of 20Mhz, and it can accumulated the corresponding data more than 5000 times, which is fully 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.

Key words: remote sensing, lidar, echo, parallel data acquisition, real-time multitask