基于水平阵的柱面声源高分辨时反聚焦定位方法  

High-resolution time reversal focused localization method for cylindrical noise source with horizontal array

作　　者：韩闯[1,2] 于树华[1,2] 时胜国[1,2] 何盼盼[1,2] 时洁[1,2] 

机构地区：[1]哈尔滨工程大学水声技术重点实验室,哈尔滨150001 [2]哈尔滨工程大学水声工程学院,哈尔滨150001

出　　处：《振动与冲击》2015年第22期92-97,共6页Journal of Vibration and Shock

基　　金：长江学者和创新团队发展计划(IRT1228);教育部博士点基金(20122304120011)

摘　　要：针对浅海条件下利用水平阵对水下目标进行噪声源近场高分辨定位会受海面、海底形成的多途效应影响,致定位结果具有严重的背景起伏甚至出现虚假目标问题,在建立水平阵近场柱面聚焦测量模型基础上,分别研究适用于单频线及宽带连续谱信号的水平阵柱面聚焦定位方法,即将幅度补偿引入MVDR(Minimum Variance Distortionless Response)近场聚焦波束形成中,充分利用声波幅度信息及相位信息,并据基于射线理论的虚源法建立水声相干多途信道模型与静态介质中波传播的互易性及时反不变性,生成与水声信道特征信息相匹配的空间聚焦导向矢量。结果表明,该方法可有效克服多途效应影响,实现柱面声源高分辨定位。The muhipath effect is caused by the surface and the bottom of the sea. When the underwater target is in shallow water,the localization of the noise source is usually influenced by the multipath effect,so that the use of horizontal array to achieve near-field high-resolution localization will be restrained.In that case,serious background fluctuation may appear and even a false target may be reached.On the basis of establishing a measurement model,the cylindrical focused beamforming localization method was introduced for both narrowband and broadband signal.In the method,on the one hand,the amplitude compensation was applied to the MVDR to fully utilize the amplitude and phase informations,and on the other hand,based on the method of image source and the reciprocity of wave propagation,a spatial focused steering vector was constructed in accordance with the characteristics of underwater acoustic multipath channel.The simulation demonstrates that the method can overcome the multipath effect and achieve the high-resolution localization of cylindrical noise source.

关 键 词：多途效应 柱面聚焦波束形成 MVDR 幅度补偿 虚拟时间反转镜 

分 类 号：TB532[理学—物理]