Frequency expanding method and system for low-frequency signals of ground penetrating radar

The invention provides a frequency expanding method and system for low-frequency signals of a ground penetrating radar, and belongs to the technical field of geological exploration equipment, and the method comprises the steps: obtaining low-frequency signals and high-frequency signals detected by the ground penetrating radar at the same position; obtaining a plurality of different-frequency single-channel electromagnetic wave frequency division signals of the low-frequency signal and the high-frequency signal respectively; calculating cross-correlation parameters among the plurality of different-frequency single-channel electromagnetic wave frequency division signals of the low-frequency signal and the high-frequency signal; respectively calculating energy distribution characteristics and weight factors of the frequency division signal of the low-frequency signal and the frequency division signal of the high-frequency signal; according to the wavelets in the frequency division signal of the high-frequency si