A novel high-accuracy digitalized measuring phase method

To measure sampled sequencespsila phase values accurately, the phase spectrum of all-phase DFT (apDFT for short) is deeply studied in this paper, and apDFTpsilas property of dasiaphase invariantpsila is distinctly expounded. Thus the dasiaapDFT measuring phase methodpsila is proposed, which can achieve high-accuracy phase measurement without any correcting spectrum operations that the computation amount is decreased greatly. Simulation experiment proves that the measurement accuracy of the proposed method is 5 amount levels higher than that of the type-1 phase difference method in noiseless circumstances, and the mean square error is at least 1/47~1/3 of that of type-1 phase difference method in low-SNR circumstances.