时移相位差校*，通过时移，进行前后两次FFT分析，利用离散频谱对应峰值谱线的相位差以求出频率和相位校正量。-Phase difference correcting method by time-shifting. Make two FFT analysis before and after the time-shifting,and make use of　the phase difference of the peak spectral lines to get frequency and phase correction amount.