Abstract：In order to improve the calculation accuracy of high frequency amplitude spectrum in the frequency attenuation analysis, this paper proposes a new approach based on time-frequency three-parameter wavelet transform. First we use time-frequency continuous three-parameter wavelet transform to calculate the amplitude spectrum of target signal, and then we calculate the attenuation coefficient of high frequency amplitude spectrum with non-linear algorithm. Theoretical calculation results prove that the proposed approach improves the resolution in both the time and the frequency domains of the short time Fourier transform (STFT), and overcomes the illusion of high frequency signal energy attenuation due to the energy overlap in three-parameter wavelet transform. Real data applications show that our approach has higher accuracy and higher test matching rate than conventional ones.
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