| 一种浅海声简正波近场分离方法 |
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| 引用本文： | 祝捍皓,朱军,郑广学,唐俊,郑红,汤云峰.一种浅海声简正波近场分离方法[J].声学学报,2019,44(1):39-48. |
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| 作者姓名： | 祝捍皓 朱军 郑广学 唐俊 郑红 汤云峰 |
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| 作者单位： | 1. 浙江海洋大学 海洋科学与技术学院 舟山 316022; |
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| 基金项目： | 国家自然科学基金项目(11704337)、浙江省海洋观察-成像试验区重点实验室资助项目(OOIT20170F01)和舟山市科技计划项目(2017C41003)资助 |
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| 摘 要： | 针对浅海环境下声简正波的近场分离问题,提出了一种基于频率-波数(Frequency-Wavenumber, F-K)变换的分离方法。该方法通过对由近场水平多道接收信号所组成的水声信号矩阵进行F-K变换,将二维接收信号矩阵从时间-空间域转换至频率-波数域,由提取频率-波数域上各阶简正波各频点的波数实现对信号中各阶简正波的分离及频散特性提取。数值模拟和水池实验对本方法在实际研究中的可靠性和有效性进行了验证,表明在500 m距离内利用本方法能可靠分离Pekeris波导中200 Hz以下各阶简正波。
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| 关 键 词： | 简正波 分离 近场 频率-波数域 海声 水声信号 时间-空间域 接收信号 |
| 收稿时间： | 2017-12-23 |
A seperation method for normal modes in shallow water under near field |
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| ZHU Hanhao,ZHU Jun,ZHENG Guangxue,TANG Jun,ZHENG Hong,TANG Yunfeng.A seperation method for normal modes in shallow water under near field[J].Acta Acustica,2019,44(1):39-48. |
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| Authors: | ZHU Hanhao ZHU Jun ZHENG Guangxue TANG Jun ZHENG Hong TANG Yunfeng |
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| Institution: | 1. Institute of Marine Science and Technology, Zhejiang Ocean University Zhoushan 316022;2. Key Laboratory of Ocean Observation-Imaging Testbed of Zhejiang Province, Zhejiang University Zhoushan 316021;3. Institute of Naval Architecture and Mechanical-electrical Engineering, Zhejiang Ocean University Zhoushan 316022;4. College of Underwater Acoustic Engineering, Harbin Engineering University 150001 Harbin |
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| Abstract: | To separate the normal modes in shallow water under near field, a separation method based on frequencywavenumber(F-K) transform is proposed in this paper. Based on F-K transformation, the 2D receipt a-coustic signal matrix, which composed by near field horizontal multi-channel signals,is processed from time-space domain to frequency-wavenumber domain, the normal modes in signals is separated by extracting the wavenumbers at each frequency for each order in the frequeny-wavenumber domain. The reliability and validity of this method in practice are verified by numerical simulation and tank experiment, which showed that the normal modes in Pekeris waveguide under 200 Hz could be obtained reliably within 500 m through this method. |
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