through the spectral lines k1, k2 and k3; 5, employing a formula f<mp>=( alpha
+k1)*delta f, and solving the peak frequency f<mp> of the signal; 6, calculating a signal frequency change rate f<c-p>, determining columns which need to be added and calculated, and calculating a corresponding peak frequency f<mp>; 7, obtaining a dynamic frequency function f<m>(p) of the change of signal with time according to the peak frequency f<mp>. The method takes the windowing short-time Fourier transform as the basis, employs an interpolation method, also can carry out the analysis of the time domain of the signal while quickly measuring the frequency, is high in precision, and is simple in calculation.
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