Improved synchronous extraction time-frequency analysis method

The invention discloses an improved synchronous extraction time-frequency analysis method, which comprises the following steps of: performing fixed window long and short time Fourier transform on a signal to obtain a time-frequency graph; a Canny edge detector is adopted to detect the time-frequency graph, and a target area is extracted; setting a window length selection interval, and selecting the optimal window length of a local area according to the minimization of the local Rayleigh entropy in the target area; constructing time-frequency variable window long-time and short-time Fourier transform by using the optimal window length of the local region; setting a frequency hopping penalty function based on a second-order local modulation operator, and extracting a time-frequency ridge line according to the frequency hopping penalty function; and setting a synchronous extraction operator to obtain improved synchronous extraction transformation only containing instantaneous frequency information. According to