A Denoising Method for Ship-Radiated Noise Based on Optimized Variational Mode Decomposition with Snake Optimization and Dual-Threshold Criteria of Correlation Coefficient

The ship-radiated noise (SN) is easily affected by other hydroacoustic objects or complex ocean when it spreads through water. In order to reduce the impact from environment, a denoising method for SN based on optimized variational mode decomposition with snake optimization (SO-VMD) and dual-threshold criteria of correlation coefficient (CC) proposed in this paper. first step optimize parameter combination, that is, number K penalty factor α, (VMD) (SO) envelope entropy (EE). Then, input signal using results decomposed intrinsic functions (IMFs) are obtained. After that, IMFs classified into three classes CC, including components, signal-noise components. Finally, all components processed denoised wavelet threshold (WT) reconstructed together. Simulations performed paper demonstrate SO more appropriate VMD has outstanding performance different kinds test signals. addition, experiments measured SNs show effective accurate denoising.