Acquisition Method of Time–Frequency Distribution Based on Short-Time Fractional Fourier Transform

With people's attention to the non-stationary characteristics of signals, the traditional frequency domain analysis methods cannot meet the needs of non-stationary signal processing. Therefore, the time–frequency analysis method for non-stationary signals has attracted more and more attention. In this paper, in view of the demand for non-stationary signal time frequency processing, the method of fractional Fourier transform is improved, and a method of obtaining time frequency distribution with high time frequency resolution is obtained, that is, short-time fractional Fourier transform. Based on the detailed description of the calculation steps of this method, it is proved that this method has certain advantages in time frequency resolution and anti-noise interference by comparing with the short-time Fourier trans for method.