Time Synchronously Averaging Method Based on Phase Estimation and Compensation

A novel time synchronously averaging method using phase compensation was proposed to deal with the periodic signal with unknown frequency. Since the phase difference was the same between adjacent data segments, it might be esti- tinted with FFT (Fast Fourier Transform), and the result can be used to compensate the phase difference between data segments As a result, all the s~ments were synchronized in phase and could be time synchronously averaged to enhance the periodic signal to the most For periodic signal with multi-frequency components, the adaptive notch filter was used to cancel the enhanced signal from the original input signal, and the remained signal could be processed in the same manner repeatedly until all the frequency comlmnents were enhanced and extracted. Computer simulations verified that the method did not need to search the unknown frequency extensively, which was more efficient in applications.