水下运动目标浅海低频矢量干涉谱研究

Research on low frequency vector interference spectrum of underwater moving target in shallow water

摘要:

面向浅海低频目标探测和矢量声场研究需求,对浅海矢量声场干涉结构的形成机理进行了研究,通过使用三参数模型方法,对水下运动目标辐射噪声进行建模,推导了所产生干涉条纹的轨迹方程,并系统分析了CPA(Closest Point of Approach, CPA)点最近通过距离、接收点深度、海底参数及声速梯度等参数对矢量声场干涉条纹结构特征与强度的影响。最后利用实测水文数据对矢量声场干涉现象进行了具体分析与验证,结果表明矢量声场蕴含独特的干涉信息,对其形成规律和特性进行深入挖掘,可为低频浅海目标探测、声场特性分析及波导环境参数估计提供新的理论依据,并为提升矢量水听器实际应用中的目标探测与环境感知能力提供了技术支撑。

Abstract:

In order to meet the needs of low-frequency target detection and vector sound field research in shallow water, the formation mechanism of vector sound field interference structure in shallow water was studied. By using the three parameters model method, the radiated noise of underwater moving targets was modeled, and the trajectory equation of interference fringes was derived. The effects of CPA (closest point of approach) distance, receiver depth, seabed parameters and sound velocity gradient on the structure characteristics and intensity of vector sound field interference fringes were systematically analyzed. Finally, the interference phenomenon of vector sound field is analyzed and verified by using the measured hydrological data. The results show that the vector sound field contains unique interference information, and the deep mining of its formation rules and characteristics can provide a new theoretical basis for low-frequency shallow water target detection, sound field characteristics analysis and waveguide environmental parameter estimation, and provide technical support for improving the target detection and environmental perception ability in the practical application of vector hydrophone.