基于DSP的频谱分析型激光多普勒信号处理器的研究  

Spectrum-analyzing laser Doppler anemometry signal processor based on DSP

作　　者：陆尧[1] 刘昌文[2] 刘杰[2] 

机构地区：[1]天津大学电子信息工程学院,天津300072 [2]天津大学内燃机燃烧学国家重点实验室,天津300072

出　　处：《光电工程》2007年第1期126-130,共5页Opto-Electronic Engineering

基　　金："高等学校骨干教师资助计划";"国家自然科学基金"资助项目(50076033)

摘　　要：为了提高激光测速系统中信号处理速度,获取更高的测量精度和实时检测能力,本文从硬件结构、传输策略和试验结果入手,提出了利用DSP芯片作为频率分析处理器的多普勒测速系统。通过对A/D控制策略,光电数据采集压缩,DMA传输和DSP处理器中的FFT谱分析和频谱校正算法的研究和对数变频模式模拟电压信号测量试验,实现了多普勒信号处理器在显示采样频率为7MHz,速度显示间隔为0.3ms的实时检测和频率细化能力。For improving signal processing speed in Laser Doppler Anemometry （LDA） system to obtain higher measure precision and real-time detection, a LDA signal processor using DSP as spectrum-analyzing processor was described based on hardware frame, transmission strategy and trial results. This processor, which introduced technologies of adjusting AD converter, sampled datum compression and DMA transmission, utilized FFT and Phase-difference spectrum correction method to acquire the Doppler frequencyfD corresponding to velocity. The measurement of simulated voltage signal in logarithm mode of frequency conversion and turnplate confirms feasibility of this signal processor, which can be used for real-time detection in 7MHz display sample frequency and 0.3ms speed display interval

关 键 词：激光多普勒测速 DSP芯片 频谱校正 数据采集 

分 类 号：TN247[电子电信—物理电子学]