SElection Of The Optimal Wavelet Base For ship radiated noise analysis?

The effect of ship radiated noise analysis is closely related to wavelet basis. This paper selects bior5.5 wavelet as the optimal basis which is based on the analysis of the characteristics of the signal and the comprehensive consideration of the three screening criterion about wavelet basis. By comparing with other wavelets used for detecting the power spectral singularity of ship radiated noise, it demonstrates the optimality of the bior5.5, the approximate orthogonality of which guarantees the accuracy of the reconstructed signal and balances the support between the compact and regularity. In order to depict the true line spectrum in low-SNR signal, a signal matching method based on WT is proposed. Through different wavelets experimental comparison, only the bior5.5 still accurately extracts the features of the ship radiated noise, which indicates the feasibility and effectiveness of the method. All results prove that the bior5.5 wavelet has the high resolution of the ship radiated noise signal.