基于四阶累量的三次相位耦合特性分析

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（２１／２）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。实际舰船辐射数据分析表明该方法可用于不同类型舰船的分类识别。

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

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.