基于FPGA的激光测速仪信号处理方案设计与实现

梁文强; 周健; 聂晓明

doi:doi:10.11884/hplpb201527.111008

强激光与粒子束, 2015, 27 (11): 111008, 网络出版: 2015-11-30

基于FPGA的激光测速仪信号处理方案设计与实现

Signal processing solution of laser Doppler velocimeter based on FPGA

论文大纲

梁文强 ^*周健聂晓明

作者单位

国防科学技术大学光电科学与工程学院，长沙 410073

摘要

为满足高动态环境下的激光多普勒测速仪信号处理需要，提出了一种基于现场可编程门阵列（FPGA）的激光测速仪信号处理方案。在FPGA内部完成全部信号处理的内容，利用快速傅里叶变换（FFT）算法得到信号的频谱，利用能量重心法对离散频谱进行校正，开发采样频率自适应算法，兼顾测量准确度与测量范围的要求，最后将结果通过通用串行总线上传个人计算机显示。程序采用流水线方式设计，提高信号处理速度。经过实验验证，数据更新率达到2.4~24 kHz, 数据延迟时间为123~1230 μs，测量准确度优于8×10-4，测量稳定度优于2.5×10-7。

Abstract

Signal processing solution of laser Doppler velocimetry in the high dynamic environment based on FPGA (field prog rammable gate array) was proposed. The whole signal processing was finished by FPGA. The signal spectrum was acquired by the FFT (Fast Fourier Transform) algorithm and was adjusted by the energy centrobaric correction method.Adaptive algorithm of sampling frequency was proposed to balance the measurement accuracy with measurement range;finally, the result through a universal serial bus (USB) was uploaded to a personal computer (PC).Pipelined architecture was used to improve the speed of signal processing.Experimental results showed that the data updating rate reached 2.4-24 kHz, the data delay reached 123-1230 μs, the accuracy was better than 8×10-4 and the stability was better than 2.5×10-7.

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梁文强, 周健, 聂晓明. 基于FPGA的激光测速仪信号处理方案设计与实现[J]. 强激光与粒子束, 2015, 27(11): 111008. Liang Wenqiang, Zhou Jian, Nie Xiaoming. Signal processing solution of laser Doppler velocimeter based on FPGA[J]. High Power Laser and Particle Beams, 2015, 27(11): 111008.

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