频谱分析型激光多普勒测速仪信号处理技术

为了提高激光多普勒测速仪的测量精度,提出对激光多普勒信号先进行跟踪滤波,再进行频谱细化和频谱校正的信号处理方法,并利用信号处理系统对实测的多普勒信号进行了实验研究。实验结果表明:跟踪滤波器在滤除基底信号及系统的部分噪声的基础上,实时跟踪多普勒信号的频率,信噪比明显提高,所得结果与多普勒频率的真实值相一致;频谱细化技术大大提高了频谱分辨力,频谱校正技术使校正后的频率更接近真实值。

Signal processing technology of spectrum-analyzing laser Doppler velocimeter

In order to enhance the accuracy of laser Doppler velocimeter, the method to track the laser Doppler signal and correct the frequency spectrum with frequency spectrum refinement and frequency spectrum correction method was put forward. The Doppler signal was studied by signal processing system. The results showed that the background signal and part of the noise were got rid of, signal-to-noise ratio was raised, and Doppler frequency was tracked so that the result agreed with the actual value and that the distinguishability of frequency spectrum was improved by frequency spectrum refinement algorithm and the corrected frequency agreed well with the actual value by frequency spectrum correction algorithm.