基于脊路跟踪的变分非线性调频模态分解方法

A variational nonlinear chirp mode decomposition algorithm based on ridge tracking was proposed aiming at the problem of multi-component signal separation caused by mixed signals from multiple emitters. The improved ridge path regrouping algorithm was used to extract the instantaneous frequency of each component from the time-frequency distribution, and the extracted instantaneous frequency of each component was used as the preset frequency of the variational nonlinear chirp mode decomposition. A repeated instantaneous frequency extraction was performed signal to update the preset frequency for iteration based on the reconstructed multi-component. The above processes were repeated until the frequency difference between two iterations was less than the preset threshold, while the corresponding mode decomposition results were output. The experimental results show that the variational nonlinear chirp mode decomposition algorithm based on ridge tracking has better performance of multi-component signal separation than the classical variational nonlinear chirp mode decomposition.