内波环境下的时频匹配场定位方法  

A Time-frequency matched field location method in the presence of internal waves

作　　者：李永飞 赵航芳[1,2,3] LI Yongfei;ZHAO Hangfang(College of Information Science and Electronic Engineering,Zhejiang University,Hangzhou 310063,China;Key Laboratory of Ocean Observation-Imaging Testbed of Zhejiang Province,Zhoushan 316021,China;The Engineering Research Center of Oceanic Sensing Technology and Equipment,Ministry of Education,Zhoushan 316021,China)

机构地区：[1]浙江大学信息与电子工程学院,浙江杭州310063 [2]浙江省海洋观测-成像试验区重点实验室,浙江舟山316021 [3]海洋感知技术与装备教育部工程研究中心,浙江舟山316021

出　　处：《哈尔滨工程大学学报》2020年第10期1605-1610,共6页Journal of Harbin Engineering University

基　　金：国家重点研发计划(2016YFC1400100);国家自然科学基金项目(61831020);中央高校基本科研业务费专项资金资助.

摘　　要：为了解决由内波引起的传统匹配场的环境失配问题,本文提出了时频匹配场处理方法。在海洋波导环境中,不同号模从声源到达接收阵的时间是不同的,由内波引起的n号耦合到m号的模与原未耦合的m号模到达时间也不相同。基于此原理,时频匹配场处理将内波环境下的数据场与无内波环境下的拷贝场在时频域进行匹配,能够对内波引起的耦合模进行抑制,从而达到正确定位的目的。仿真结果表明:时频匹配场能够在内波环境下对声源进行准确定位,但主瓣强度有一定损失;在无内波环境下与传统匹配场相比,距离维旁瓣略有降低,但总体性能相近。To solve the problem of the environment mismatch caused by internal waves,in this paper we propose a time-frequency matched field processing method.In the ocean waveguide environment,the arrival times of different modes differ,so the arrival time of a coupled m mode from an n mode also differs from that of uncoupled m mode.On this basis,coupled modes could be suppressed using a time-frequency matched field processing method,whereby the data field in the internal wave environment is matched in the time-frequency domain with the copy field in an environment with no internal waves to obtain the correct location.The simulation results show that the matched time-frequency field can locate the sound source in the internal wave environment,but the main lobe intensity experiences a certain loss.In the no-internal-wave environment,the side lobe of the matched time-frequency field is slightly reduced relative to that of the traditional matched field,but the general performance is similar.

关 键 词：内波 简正模 模耦合 时频 匹配场 定位 失配 声场 

分 类 号：TB566[交通运输工程—水声工程]