The 7-terms Harris window and interpolated FFT harmonic analysis method for electrified railway

This paper presents the 7-term Harris window and interpolated FFT harmonic analysis method for electrified railway. In addition, the paper discusses the harmonic characteristics of electrified railway and the sidelobe characteristics of the 7-term Harris window. Whenanalysis harmonic signal, good sidelobe characteristics of window function are needed. While the characteristics of the mainlobe do not matter so much. We propose increasing the numbers of terms in the window function to get better sidelobe characteristics at the expense of losing some mainlobe characteristics. The experimental results show that the algorithm in the case of non-synchronous sampling has high harmonic frequency, amplitude, and phase calculation accuracy, that selective harmonic analysis reduces the computation time by 50%.