Noise reduction method and noise reduction system for very-low-frequency thunder and lightning signals and storage medium

By combining the dung beetle algorithm and the VMD algorithm, the optimal parameters are determined to decompose the lightning signal and remove noise. Combined with the EMD algorithm for secondary noise reduction, the problem of deep coupling between very low frequency lightning signals and noise is solved, and efficient and accurate noise removal and lightning signal restoration are achieved.

CN120596797APending Publication Date: 2025-09-05HEFEI UNIV OF TECH
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Patent Information

Application Number
CN202510703012.9
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-05-28
Publication Date
2025-09-05

AI Technical Summary

Technical Problem

In the existing technology, very low frequency lightning signals are deeply coupled with noise signals in complex electromagnetic environments, resulting in reduced lightning monitoring accuracy and misjudgment, making it difficult to remove noise signals efficiently and accurately.

Method used

The dung beetle algorithm is used to determine the optimal decomposition mode number and penalty factor, and the VMD algorithm is combined to decompose the lightning signal. After removing the noise signal, the signal is reconstructed and further secondary denoising is performed using the EMD algorithm to ensure the effective removal of the noise signal.

Benefits of technology

It achieves efficient and accurate removal of noise signals in very low frequency lightning signals, improves the monitoring accuracy and positioning accuracy of lightning signals, and reduces the misjudgment rate.

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Abstract

The invention belongs to the technical field of thunder and lightning signal noise reduction, and particularly relates to a noise reduction method and noise reduction system for very low frequency thunder and lightning signals and a storage medium. The noise reduction method comprises the steps of obtaining a plurality of position points of a current mixed lightning signal in a dung beetle algorithm after the mixed lightning signal is obtained; after a position point corresponding to the minimum envelope entropy in the current mixed lightning signal is calculated based on a VMD algorithm, the abscissa and the ordinate of the position point corresponding to the minimum envelope entropy are respectively recorded as an optimal decomposition mode number and an optimal penalty factor; decomposing the current mixed lightning signal into a linear superposition form of a plurality of decomposed signals by using a VMD algorithm based on the optimal decomposition mode number and the optimal penalty factor; after the decomposition signals representing the noise are removed, linear superposition of the remaining decomposition signals is reconstructed, and the very-low-frequency thunder and lightning signals are obtained. According to the method, the noise signal deeply coupled with the very low frequency lightning signal can be efficiently and accurately removed, and the real very low frequency lightning signal is restored.
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Citation Information

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