A Improved Method of Analysis of Nonstationary Signal

Wigner ville distribation and short time Fourier transform are the main time-frequency analysis methods. However, both of them have their advantages and limitations. On the base of the definition of the two transform, this paper analyzes the connection between them, then proposes an improved method through the construction of window function. Computer simulation shows the time-frequency character of signal is improved and the method is applicable to the analysis of multicomponent nonstationary signal.