摘要
分段式永磁直线同步电动机垂直提升系统解决了单段型动子需要拖线的供电方式,但是系统信号却较难检测,而且工作现场存在着大量的干扰信号。分析了小波包变换具有良好的时频特性的特点,并根据信号和噪声具有不同的小波特性,采用浮动阀值去噪的方法,解决了低信噪比情况下弱信号的检测。最后使用Matlab仿真模拟了基于小波包变换的浮动阀值去噪和在强噪声背景下,弱信号的检测说明对弱信号检测有一定改善。
The vertical elevation system about the type of segmental permanent magnet linear synchronous motor, solved the power supply way of single segmental moving part needed dragging cable, but the signal of the system is actually more difficult to detect, moreover the job site has the massive unwanted signal. The paper analyses the excellent time-frequency localization analysis properties of wavelet packet transform, and according to the different wavelet properties between the signal and noise, and realizes the weak signal detection using floating threshold denoising based on wavelet packet transform. Finally, it emulates the weak signal detection in strong noise background using floating threshold denoising in Matlab simulation
出处
《微电机》
北大核心
2008年第6期17-19,共3页
Micromotors
基金
国家自然科学基金项目(60474043)
