基于模态陷获能量比的水面水下目标分辨技术  

Use of trapped and propagating mode energy ratio for discriminating between the surface target and the underwater target

作　　者：余赟 刘清宇 虞飞 殷敬伟[2] YU Yun;LIU Qingyu;YU Fei;YIN Jingwei(Naval Research Academy, Beijing 100161, China;College of Underwater Acoustic Engineering, Harbin Engineering University, Harbin 150001, China)

机构地区：[1]海军研究院,北京100161 [2]哈尔滨工程大学水声工程学院,黑龙江哈尔滨150001

出　　处：《哈尔滨工程大学学报》2022年第3期318-324,共7页Journal of Harbin Engineering University

摘　　要：水面水下目标分辨是水声领域中迫切需要解决的难点问题。本文利用浅海负跃层水文条件下水面水下目标声场主导模态差异性,通过波束形成空域滤波器设计方法分别估计接收信号中反转模态能量和传播模态能量,根据能量比估计结果实现水面水下目标分辨。仿真结果表明:当水平接收阵位于跃层内或跃层下时,该方法可以对非正横方位目标进行准确分辨,并且处理频段越宽、基阵孔径越大、临界深度与目标深度差异越大,分辨正确率越高。The surface target and underwater target discrimination is an urgent and difficult problem in the field of underwater acoustical research.Using the dominant mode difference of the surface source and underwater source acoustic fields in shallow water with the thermocline,the beamforming spatial filters are designed to estimate the refracted mode energy and the propagating mode energy.Further,the energy ratio is used to discriminate between the surface and underwater target.The simulation results show that when the horizontal receiving array is in or under the thermocline,the target not abeam can be accurately discriminated using the method.Moreover,the wider the processing frequency band is,the larger the array aperture is,the greater the difference between the critical and target depth is,and the higher the discrimination accuracy.

关 键 词：水面水下目标分辨 浅海 负跃层 简正波 反射模态 反转模态 水平阵 空域滤波 

分 类 号：TB566[交通运输工程—水声工程]