零差激光测振系统中含噪多普勒信号处理方法  

Noisy Doppler signal processing for homodyne laser vibrometer system

作　　者：何武光[1] 王豹亭[1] 杨春平[1] 康美苓[1] 吴健[1] 

机构地区：[1]电子科技大学光电信息学院,四川成都610054

出　　处：《光电子．激光》2011年第12期1842-1846,共5页Journal of Optoelectronics·Laser

基　　金：国家"十一五"预研资助项目(H04010201)

摘　　要：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动信号,当信噪比(SNR)达到10dB时频率测量误差小于3%,降低了新型零差激光测振系统对测量环境的要求。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 orthogo- nal 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 sig- nal 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.

关 键 词：零差激光测振 含噪多普勒信号 最小二乘法 单位圆校正 

分 类 号：TN249[电子电信—物理电子学]