SYNTHESIZED CORRECTING METHOD OF PHASE DIFFERERNCE ON DISCRETE SPECTRUM

摘要

The fundamental of the three existing methods of Phase Difference Correction on discrete spectrum is uniform, that is performing FFT analysis twice through time-domain shifting time series or changing window's length, and finally correcting spectrum by making use of the phase difference of two corresponding peak lines. Based on this principle, this paper presents a synthesized method, including time-domain shifting, window-length changing and window-type changing (the second time-domain sequence lags behind the first one with L points, performing N-point FFT analysis on the first sequence and M-point FFT analysis on the second one with different windows, and finally correcting peak lines). The methods referred in the twelfth, eleventh and thirteenth reference documentation are only three particular cases of this one when parameter is changing. Simulation results show that this synthesized method is easily carried out with high precision, applicable for all kinds of symmetrical window function and having high ability of anti-noise.