基于小波包分解和虚拟仪器的传导干扰信号检测

小波包分解(WPD)不仅能检测非平稳信号的整次谐波，还能检测信号的非整次谐波，且小波变换本身对信号的奇异点十分敏感，常常用来跟踪开关电源传导干扰信号.在虚拟仪器(VI) LabVIEW 6.i平台上，基于小波包变换算法设计了VI程序，实现了开关电源传导干扰信号实时检测系统.该系统具有信噪分离、测量传导干扰功率谱、伴有噪声的原始振动波形和噪声波等测量功能,实测结果表明该方法是可行的和有效的.

Signal Detection of Conduction Interference Based on Wavelet Packet Decomposition and Virtual Instrument

Wavelet packet decomposition( WPD) can not only detect integral harmonics  of non-stationary signal,but also detect non-integral harmonics of it;and because  wavelet transformation singular is very sensitive to signal of the strange point,it can be used to follow the conduction interference signal in switches power supply.In virtual instrument( VI) LabVIEW 6.i software workbench,algorithm design based on wavelet packet decomposition  is developed,combined with virtual instrument (VI) program,which realizes real-time detection system of the conduction interference signal in switches power supply.The system presented here has the measurement functions  followingsignal-noise separation,power spectrum of conduction interference,original vibration wave with noise and noise wave etc.The result shows that that method is feasible and effective.