基于1(1)/(2)维谱的舰船辐射噪声低频线谱成分提取

分析了1(1)/(2)维谱具有的几个特殊性质,即抑制高斯噪声和对称分布噪声;加强信号的基频分量以及剔除非耦合相位的谐波分量.通过计算实际舰船噪声的1(1)/(2)维谱,并利用它所具有的特征参数,对舰船信号进行了分类与识别,达到了较好的识别效果, 为进一步开展水下目标探测与识别研究打下了良好基础.

EXTRACTION OF LOW FREQUENCY LINE SPECTRUM OF SHIP RADIATED NOISE BASED ON THE 1(1)/(2) D SPECTRUM

Special properties of a 112D spectrum were analyzed. By means of these properties, the Gaussian noise and symmetrically distributed noise can be restrained. The fundamental frequency component of the harmonic signals can be enhanced and non-quadratic phase coupling harmonic components can be eliminated. By calculating the 112D spectrum of actual ship radiated noise, fine results in classification and identification have been achieved. This will be of help in the research of detecting and identifying underwater objects.