Intelligent vibration perception perimeter security system in the acquisition of knock signal has the characteristics of non-stationary and transient. There are three kinds of knock signal, in turn, fast Fourier transform, wavelet packet frequency band energy spectrum, fast spectral kurtosis analysis. Due to the sampling frequency is too high, In the fast Fourier transform to the disadvantage of time-frequency analysis, so under the precondition of undistorted signal down sampling pretreatment methods are put forward. Finally, it describes the three methods of spectrum analysis and comparison the pros and cons of three kinds of spectral analysis in the practical engineering application.%振动信号的谱分析是周界安全防范系统中一种重要的技术,其具有非平稳、瞬态等特点. 文章针对现场采集的敲击振动信号依次进行快速傅里叶变换、小波包频带能量谱、快速谱峭度分析. 由于信号采样频率过高,在进行快速傅里叶变换时不利于时频分析,因此在不失真的前提下提出信号降采样的预处理方式.最后,分别描述了这3种谱分析方法并在实际工程应用中对比3种谱分析的优劣性.
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