Abstract：The window with good side lobe behavior is the key factor for the improvement of accuracy of spectral analysis. This paper proposes the Nuttall self-convolution window(NSCW), which is constructed by the self convolution of Nuttall window in time domain. The NSCW has the advantage that its sidelobe behavior is improved rapidly with the increasing of times of self convolution. The Novel spectral analysis based on improved FFT by Nuttall self-convolution window is presented, where the spectral interpolation polynomial is deduced based on the least square method and the calculation of harmonic parameters is then obtained. The effectiveness and correctness of the proposed method are shown by the simulations.
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2014, Vol. 29 
