基于小波重排的多项式调频信号分析

Polynomial Frequency Modulation Signal Based on Wavelet-Reassignment Method

针对常规时频方法用于多项式调频信号分析的不足,提出基于小波重排的方法,解决多项式调频信号交叉项干扰和时频聚集性之间的矛盾。该方法具有较好的抗噪声性能。在对小波重排原理进行综述的基础上,将其用于对多项式调频信号进行时频分析,并与其它方法进行了比较。仿真实验表明,小波重排方法具有综合优势。

The method based on wavelet transform and time-frequency reassignment is proposed instead of conventional time-frequency measure which has the shortcomings of low precision and cross- term in polynomial frequency modulation signal analysis. It not only overcomes the contradiction be- tween the cross terms of polynomial frequency modulation signal and the approximate time-frequency centering, but also is good at suppressing noise. The principle and application of wavelet-reassign- ment are summarized, and the polynomial frequency modulation signal analysis method is made based on the wavelet-reassignment, and compared with other methods. The simulation results show that the novel method has comprehensive advantages.