Abstract：In order to solve the problem of spectrum aliasing caused by high harmonics, the low-pass filter (LFP) is used by the bay control unit (BCU) before sampling in general. In view of the attenuation of 2~15 times harmonics caused by the low pass filter, and the limitation of fixed compensation method, a frequency autocorrelation compensation algorithm is designed in this paper, in order to ensure the measurement precision, the real-time compensation coefficient of the amplitude and phase is calculated according to the practical frequency calculation, at the same time, in view of the high harmonics influence on frequency calculation, a rotation vector frequency measurement method is designed in this paper, increases the precision of frequency calculation effectively., the effectiveness of the improved scheme is proved through test and actual application.
2016, Vol. 17 
