舰船辐射噪声的非线性和确定性检验

为提取舰船目标辐射噪声非线性和混沌特征,实现对舰船目标的自动识别,首先需要对舰船辐射噪声时进行非线性检验和确定性检验。运用替代数据方法,选择合理的检验统计量,根据实验数据与替代数据之间峭度和自相关两个量的差异性,分析得出舰船辐射噪声信号有非线性成分。另外,对舰船辐射噪声时间序列作相空间重构,根据递归图中出现规则图案,定性分析出舰船辐射噪声信号具有确定性成分存在。该结论为下一步提取舰船辐射噪声非线性混沌特征奠定了理论基础。

Testing for Nonlinearity and Determinism in Ship Radiated Noise

For extracting the nonlinear and chaotic feature of ship radiated noise,and recognizing ship target.Nonlinearity and determinism should be tested based on the ship radiated noise firstly.Surrogate data method is used to analyze the nonlinearity of the noise series by comparing the difference of a 3th-order quantity and 3th auto-correlation between detected data and surrogate data.On the other hand,phase space of ship radiated noise series is reconstructed and get the recurrence plot,simulation results show that the ship radiated noise has determinism composition by analyzing the regular pattern in recurrence plot.The conclusion makes the base of the further research on nonlinear and chaotic feature extraction of ship radiated noise.