为了降低激光多普勒测速信号中的噪声, 采用在仿真激光多普勒测速信号中加入高斯白噪的方法, 通过小波分层后高频系数置零法和小波阈值去噪法2种方法进行仿真去噪, 进行了仿真分析及实验验证。结果表明, 小波分层后高频系数置零法能够提高信噪比获得图形光滑的信号, 达到较理想的去噪效果。这一结果对提高在激光多普勒测速系统信号检测应用中的准确性是有帮助的。

In order to reduce the noise in laser Doppler velocimetry signal, the method that Gaussian white noise was added to the simulated laser Doppler velocimetry signal was used. The high frequency coefficient zeroing method and the wavelet threshold denoising method were adopted for denoising after wavelet layering. The simulation analysis and experimental verification were carried out. The results show that, the high frequency coefficient zeroing method after wavelet layering can improve the signal-to-noise rate to get smooth graph signals and achieve an ideal denoising effect. The result is helpful to improve the accuracy of signal detection in laser Doppler velocimetry system.