Frequency estimation method for sine signal

The invention provides a frequency estimation method, particularly a method capable of implementing rapid and accurate frequency estimation of a sine signal. The invention gets rid of a conventional idea of estimating the frequency of the sine signal and discloses a novel frequency estimation method for the sine signal. The frequency estimation method for the sine signal comprises the following steps of: on the basis of the Fourier transformation, extracting phase information by key technologies such as a frequency domain zero setting technology, a time-domain phase taking technology and the like; and accurately estimating the frequency of the sine signal by the phase information. According to the method, the principle is simple; the algorithm is practical; the interpolation operation does not need to be carried out; and the requirement on the frequency of the detected signal is low. The frequency estimation method is simple to implement, has high accuracy, is also applicable to the high and low SNR (Signal t