Correlator spectrum analyser versus FFT spectrum analyser

摘要

There are two main ways for non parametric digital spectral analysis . Spectral analysis by means of FFT (so calledudperiodogram method) and spectral analysis by mean of Fourier transform of correlation function (so calledudcorrelogram method) .udWe show that, in opposite to the general opinion, these two methods are not equivalent .udIn this paper, we compare botte methods and we infer superiority of correlogram method (accuracy, résolution, flexibility, bandwith) .