Method for eliminating random error of signal phase

The invention discloses a method for eliminating the random error of a signal phase. The method is based on the optimization, the estimation, the calculation and the acquisition of a real phase shift value between a start time and a key phase zero position and corrects the FFT (Fast Fourier Transform) phase value of a test signal by the real phase shift value and further eliminates the influence of the sampling random error on the signal. The method for correcting the phase, which is provided by the invention, has apriority, theory and experimental evidence in the control aspect of acquiring the random phase error of the signal. Through operation according to the method provided by the invention, the single sampling random phase error of the test signal can be controlled in a satisfactory accuracy range. For phase is an important parameter in the fields of vibration test, analysis and control, the method can be widely applied to the industrial field for reducing vibration and eliminating noise.