Micro-seismic signal denoising method based on variational mode decomposition and energy entropy

In order to extract the effective micro-seismic signal from the polluted noisy signals,a new micro-seismic sig- nal denoising method is proposed based on variational mode decomposition ( VMD) and energy entropy. Firstly,the noisy signal is decomposed by variational mode decomposition to obtain a series of variational mode components ranked by frequency in descending order;secondly,the energy entropy of each variational mode component is calculated,and the boundary between noise and signal is identified;finally,the high frequency noises above the boundary are filtered, and the others variational mode components are accumulated and reconstructed,and the authors obtain the denoised micro-seismic signal. Comparison with empirical mode decomposition (EMD) denoising method from three evaluation indexes SNR,ESN and RMSE,the experimental results show that the proposed method can remove noise to a greater extent and provide reference for noise reduction of micro-seismic signals.