零差激光测振系统中含噪多普勒信号处理方法

针对零差激光测振系统中多普勒信号的噪声导致信号正交校正困难、增大测量误差的问题，提出了含噪多普勒信号处理方法。首先利用平滑滤波对两路含噪多普勒信号进行降噪处理，再通过最小二乘法对非正交多普勒信号进行校正，然后采用单位圆校正算法二次校正成正交信号，最后利用微分相除积分操作解调出振动信号。实验结果表明，本文方法能有效解调振...

Noisy Doppler signal processing for homodyne laser vibrometer system

Due to the difficulty of orthogonal correction and the increasing measurement error with noise in Doppler signals for homodyne laser vibrometer system,a novel noisy Doppler signal processing algorithm is proposed and realized.Firstly,two noisy Doppler signals were denoised by a smoothing filter.Secondly,the denoised Doppler signals were corrected by the least-squares method and became orthogonal signals through the unit circle correction.Finally,the vibration signal was obtained from quadrature signals by differential-division-integral operation.The results of experiment show that the vibration signal can be demodulated from noisy Doppler signals effectively with this signal processing method,and the measurement error of frequency is less than 3% when the signal-to-noise ratio(SNR) reaches 10 dB.Accordingly,the requirement of measurement environment in the novel homodyne laser vibrometer system is reduced.