DFT accurate amplitude, phase and frequency analysis method

DFT accurate amplitude, phase and frequency analysis method is proposed in this paper, which takes full advantage of the relationship between apFFT(all phase FFT) and traditional FFT, and the character of apFFT not changing the signal´s phase. The method resolves the errors that exist when the spectrum line is not on the peak position when implemented DFT on the signal, with clear definition and simple algorithm .The frequency error is little than 0.00006 frequency resolution and the phase error is little than 0.0000001 and the amplitude error is little than 0.02%, so the method has great value.