1(1/2)维谱在舰船辐射噪声线谱提取中的应用

Application of 1(1/2)D spectrum to line spectrum extraction of ship radiated noise

舰船辐射噪声的线谱成分包含有大量的舰船特征信息,是被动声呐识别目标和估计目标速度的依据。本文对1(1/2)维谱的抑制高斯噪声、增强信号基频分量和剔除非耦合相位的谐波分量等特性进行仿真,通过对2种船型的舰船辐射噪声实测数据进行处理,得出结论,1(1/2)维谱对线谱基频具有增强作用,并且能够有效地抑制高斯背景噪声,相比于传统的功率谱方法,1(1/2)维谱更有利于舰船辐射噪声线谱的提取。

Line spectrum of ship radiated noise contains a lot of ships feature information which is the basis of passive sonar target identification and target speed estimation. The paper analyses and simulates some special properties of 1 1/2 D spectrum. By means of these properties,the Gaussian noise can be restrained. The fundamental frequency components of the harmonic signals can be enhanced and nonquadratic phase coupling harmonic components can be eliminated. By processing the ship radiated noise date of two different ships,the following conclusions can be obtained. 1 1/2 D spectrum can enhance the fundamental frequency component of the ship radiated noise and restrain the Gaussian noise. Compared to the traditional method of power spectrum,1 1/2 D spectrum is more conductive to the line spectrum extraction of ship radiated noise.