基于复解析带通滤波器的ZFFT算法分析与仿真

Analysis and Simulation of ZFFT Algorithm Based on Complex Analytical Bandpass Filter

在实际工程应用中进行频谱分析时,一般只关心某一频带范围内的局部频谱,此时应使用频谱细化算法如基于复解析带通滤波器的ZFFT(简称复解析ZFFT)算法对频谱进行选带细化分析。本文在分析复解析ZFFT算法原理的基础上,通过MATLAB平台对复解析ZFFT频谱细化算法的有效性进行仿真研究。结果表明,复解析ZFFT算法能够在相同快速傅里叶变换(Fast Fourier Transform,FFT)运算量的情况下,大大提高信号的频率分辨率,实现局部细化频谱。

When performing spectrum analysis in practical engineering applications, only the local spectrum in a certain frequency band is often concerned. In this case, we consider using a spectrum zoom algorithm, such as the ZFFT algorithm based on complexanalytical band-pass filters to perform band refinement analysis. In this paper, based on the analysis of the complex analytical ZFFT algorithm, we conduct a simulation study on the effectiveness of the complex analytical ZFFT spectrum zoom algorithm through the MATLAB platform. The results show that ZFFT algorithm can greatly improve the frequency resolution of the signal, and achieve local refinement of the spectrum under the same Fast Fourier Transform(FFT) operation.