基于四阶累量的三次相位耦合特性分析

Analysis of Cubic Phase Coupling Characteristics Based on Fourth-order Cumulant

应用四阶累量分析三次相位耦合于舰船辐射噪声的特性提取。首先给出了四阶累量的一种特殊定义，然后分析其对角切片的傅立叶变换（维谱）在提取三次相位耦合特征方面的优良特性，最后将此方法应用于实际舰船辐射噪声的特征分析。结果表明：利用该方法分析三次相位耦合，具有运算量小、计算速度快的特点和良好的抗噪性。实际舰船辐射噪声数据分析表明该方法可用于不同类型舰船的分类识别。

Fourth-order cumulant is used for analyzing the cubic phase coupling and extracting the features from ship-radiated noise. A special definition of fourth-order cumulants is given and Fourier trandform of it' s diagonal slices (2 1/2-dimensional spectrum)is developed to deal with the cubic phase coupling. The proposed method may be applied to extract the features of the ship-radiated noise for various types of ships. Simulation results show that the method has many advantages:small calculation amount,fast computation speed and high noise resistance.