基于复调制细化谱的非平稳信号分析研究

Non-Station Signal Analyse And Appliance Based On Multiple Modulation Zoom Spectrum Analysis

信号分析方法是当前电子通讯工程系统检测中重要的基础技术,分析结果的精确程度是诊断成功与否的关键因素。在系统故障诊断信号分析中,往往会遇到密集型频谱信号,要求有足够高的频率分辨率。目前有多种高分辨率FFT算法,但这些算法各有长处和不足。本文采用复调制细化谱法对电子通讯设备信号进行检测分析。实验仿真证明,该方法能对任意给定频率附近的频谱进行细化,并且从分析精度、计算效率、分辨率、灵活性等方面来看,基于复调制细化谱方法都是一项行之有效的方法。

The improving the quality of fault detection of electric system depends on the accurate and real-time detection of dense spectrum.The mutiple modulation zoom spectrum method can slake this detect.When the mutiple modulation zoom spectrum method is implement,the interesting frequency band is moved to the zero by complex multiplication,a low pass filter is used to avoid the spec-trum leak,the filtered data is resample and get a short samples.By this way the mutiple modulation zoom spectrum method can get the high frequency resolution in the interesting frequency band and low frequency resolution in the other frequency band.This algorithm is simulated and analyzed,it is proved that it has be higher frequency resolution,better stability,anti-noise than traditional FFT.It is propitious to application of dense spectrum,and has employ value about analysis and diagnosis for online device.