Theoretical analysis and simulation of phase difference correction algorithm

The paper presents a discrete spectrum analyzing method based on DFT, which can effectively reduce the phase error by choosing the window function with a real even function that has the linear phase spectrum. Since the traditional DFT algorithm could result in larger measurement error because of the spectral leakage and fence effect, the phase difference correction algorithm is proposed to cope with the problem. The simulation results indicate that the correction algorithm with Hanning window function can effectively improve the metering precision.