Time-frequency aliasing digital communication signal frequency estimation method based on inter-frame conjugate correlation

The invention belongs to the technical field of signal processing, particularly relates to a time-frequency aliasing digital communication signal frequency estimation method based on inter-frame conjugate correlation, and solves the problems that high-order PCMA mixed signal frequency offset estimation is poor in precision and high in complexity. According to the method, it is assumed that the frame length is known or obtained through self-correlation function estimation and the frame lengths of two paths of signals are different, frequency offset is converted into a fixed phase difference related to the frame length by utilizing inter-frame correlation characteristics introduced by a frame synchronization sequence in the framing process of a digital communication physical layer, and the fixed phase difference of the frame synchronization sequence is estimated, so that the frequency offset is converted into the fixed phase difference related to the frame length. And high-precision frequency offset estimation