宽带参量阵技术在近海探测中的研究  

Research on wideband parametric acoustic arrays used in shallow water detection

作　　者：邹彬彬[1] 陈晶晶[1] 王润田[1] ZOU Binbin CHEN Jingjing WANG Runtian(Shanghai Acoustic Laboratory, Chinese Academy of Science Shanghai 20003)

机构地区：[1]中国科学院声学研究所东海研究站,上海200032

出　　处：《声学学报》2016年第6期797-803,共7页Acta Acustica

基　　金：上海市科委创新行动计划项目(12231203800)资助

摘　　要：文章针对非线性声学宽带参量阵技术应用于近海海底剖面绘制及掩埋物探测进行了分析研究。对于宽带参量阵声呐产生的差频信号利用Berktay包络解调理论和KZK(Khokhlov-Zabolotskaya-Kuznetsov)方程,对其进行了理论分析,水池实验研究和时域数值模拟,并结合声呐方程计算,说明该技术用于近海探测的可行性。本文同时结合脉冲压缩技术对产生的宽带差频信号做匹配处理,用于提高设备的垂直分辨率。最后在海试实验中,利用文中设计的参量阵声呐,分别使用宽带差频信号和单频差频信号对浅海海底沉积层和海底掩埋管线进行探测,取得了清晰的剖面图和掩埋物探测结果,验证了宽带参量阵技术在海底探测中的有效性和实用性。Nonlinear acoustics allows for applications like parametric arrays in underwater acoustics. Broadband para- metric acoustic sonar used in shallow water detection will be discussed, which is able to produce Low frequency signal with wide bandwidth. In tank experiment, difference frequency signal and its pressure level, effective length of broad- band parametric arrays are all tested. Also Berktay＇s far field solution and KZK （Khokhlov-Zabolotskaya-Kuznetsov） equation are applied to analyze these parameters. Meanwhile, to the broadband difference frequency signal （Linear Frequency Modulation） obtained in the experiment, pulse compression is adopted to improve its detection resolution. The effectiveness and reliability of this system are verified in sea trial. Broadband difference frequency signal and single difference frequency signal are used to profile the shallow water sub-bottom and its buried objects respectively.

关 键 词：脉冲压缩技术 垂直分辨率 包络解调 发射换能器 声呐方程 管线铺设 海试 信号频率 水池试验 线性调频 

分 类 号：P715[天文地球—海洋科学] TB56[交通运输工程—水声工程]