Research on feature extraction of ship radiation noise based on empirical mode decomposition
The line spectrum component in ship radiated noise has high intensity and stability.By measuring and track-ing the line spectrum,the motion parameters of the target can be accurately estimated.To this end,a ship radiation noise fea-ture extraction method based on empirical mode decomposition is studied.Firstly,construct a mathematical model for ship radiated noise to obtain ship radiated noise signals.Then,the empirical mode decomposition method is used to extract 7 em-pirical mode components and 1 residual term of ship radiation noise,and the sample entropy of the empirical mode compon-ents of ship radiation noise is calculated using ice.Finally,select the modal component of ship radiation noise with the highest sample entropy as the feature of ship radiation noise.The experimental results show that this method can accurately obtain the radiated noise of ship operating equipment and has strong ability to frame ship radiated noise.This method can also effectively decompose ship radiation noise into different empirical mode components,greatly reducing the residual of ship radiation noise to close to zero.
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