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

Journal of Atmospheric and Environmental Optics ›› 2018, Vol. 13 ›› Issue (2): 151-160.

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 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 Online:2018-03-28 Published: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)

Abstract

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

CLC Number:

TN958

LI Xin-Qiang, ZHANG Tian-Shu, FU Yi-Bin, XIANG Yan, LIU Yang. Design of Data Acquisition Card for Lidar Echo Signal Based on FPGA[J]. Journal of Atmospheric and Environmental Optics, 2018, 13(2): 151-160.

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