Main signal suppression method and system based on mutual information measurement and variational mode decomposition

The invention relates to the technical field of radiation source individual identification, in particular to a main signal suppression method and system based on mutual information measurement and variational mode decomposition, and the method comprises the steps: obtaining a radiation source receiving signal phase, and filtering Gaussian noise through wavelet transformation; performing phase decomposition on radiation source receiving signals in different frequency domains into different modal functions, and obtaining phase mutual information of each modal function and an original signal; main signal phase components are screened through mutual information, modal functions with mutual information values larger than a preset threshold value are reserved according to the mutual information values, and main signal phases are reconstructed; and subtracting the reconstructed main signal phase from the original signal phase to obtain an unintentional phase modulation signal phase after main signal suppression. Acc