Abstract
The traditional input data truncating way of spectrum analysis is improved and all phase FFT (apFFT) spectrum analysis is put forward, we propose the realization diagram and analyze that amplitude spectrum of all phase is the square of traditional spectrum analysis. The method of apFFT has perfect characteristic of phase analysis ,The phase isn't influenced by frequency shift through the method of all phase and no need to be corrected, the error is extremely small between the phase analyzed by apFFT and the signal real phase .We propose a new algorithm of sinusoidal signal's amplitude frequency and phase estimation based on apFFT phase difference , simulation result and comparable datas prove that the algorithm is more accurate and practicable than algorithms in literatures.
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