对角切片谱法分析信号中相位耦合的频率分量

给出了三阶累积量对角切片谱的性质，分析了水中目标辐射信号的特点，并将3阶累积量对角切片谱法应用于提取水下目标辐射信号中相位耦合的频率分量。以水下某目标辐射噪声的实测数据为例，进行了仿真研究。结果表明，该方法在提取水下运动目标辐射信号中的参加相位耦合的频率分量和相位耦合产生的频率分量、抑制环境噪声和非耦合的频率分量等方面的性能优于自相关谱法。

Diagonal slice spectrum method for the analysis of phase coupling frequency compo nents in signals

For improving the ability of the underwater detection system to detect underwater moving target,we give the characteristics of third order cumulants,analyze the feature of signals radiated by underwater target and develop a special feature extraction method for underwater moving target-radiated square phase dynamic coupling signals and quadratic phase dynamic coupling signals using third order cumulant diagonal slice spectrum method.Simulation test with the underwater moving target-radiated da-ta is also included.Results show that the proposed method successfully extracts the attended phase dy-namic coupling frequency components and procreant frequency components for dynamic coupling in mixed distribution noise and that the performances in these aspects is superior to that of autocorrelation method.