单阶简正波宽带干涉特性与孤立子内波定位  

Broadband interferen ce of single normal mode and solitary internal wave localization

作　　者：朴胜春 张士钊[2] 刘佳琪 李晓曼 IQBAL Kashif PIAO Shengchun;ZHANG Shizhao;LIU Jiaqi;LI Xiaoman;IQBAL Kashif(Acoustic Science and Technology Laboratory,Harbin Engineering University Harbin 150001;College of Underwater Acoustic Engineering,Harbin Engineering University,Harbin 150001)

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：《声学学报》2020年第5期637-645,共9页Acta Acustica

基　　金：国家自然科学基金项目(11234001,11474073);中央高校基础科研基金项目(3514497)资助。

摘　　要：为了分析孤立子内波(SIW)对声场干涉特性的影响以及由此监测SIW,我们采用抛物方程模型,分析了孤立子内波影响下简正波耦合带来的单阶简正波宽带脉冲序列的干涉特性;仿真了宽带脉冲信号穿过SIW时,单阶简正波接收脉冲序列随内波位置的变化情况,分析了它们的时空干涉特性和机理;基于耦合简正波理论,推导得到了内波位置和干涉条纹斜率之间的关系。仿真表明,这一关系式可以精确估计SIW距离,估计精度和稳定性比以往方法大大提升。此外,还根据单阶简正波干涉图样在频率上的周期性,推导了另一种估计SIW距离的方法,该方法具有更好的实时性。SIW-简正波干涉关系可用于改善声场定位,对于海洋学、海洋工程和海洋军事等方面具有重要价值。此外,该关系还可以拓展到其他的局部特性变化的探测,如金属探伤和海底地形突变定位等。To analyze the influence of Solitary Internal Wave(SIW)on acoustic field interference pattern and thereby monitoring SIW,we adopt parabolic equation model to simulate the variation of received pulse sequence of single normal mode with internal wave position when broadband pulse signal propagates through SIWs,and the spatiotemporal interference characteristics and mechanism of the sequence are analyzed.The relationship between internal wave position and interference striation slope is derived based on coupled mode theory,and simulation results show that the relationship can be used to monitor the position of solitary internal waves precisely,with greatly improved precision and robustness compared with previous work.Furthermore,we also develop another method to estimate SIW position based on the periodicity over frequency of the single normal mode interference pattern,which has better real-time property than the first method.The SIW-normal mode interference relationship can be used for improving acoustic field localization,which has great value for oceanology,marine engineering,marine military and so on.Besides,the relationship can be expanded to detection of other local characteristic variation,like metal flaw detection and localization of dramatic variation of ocean bottom bathymetry.

关 键 词：抛物方程模型 宽带脉冲 简正波 精确估计 脉冲序列 声场定位 海底地形 海洋工程 

分 类 号：O429[理学—声学]