| 浅海鼓虾噪声声源级测量方法 |
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| 引用本文： | 袁竹清,鄢社锋,Song H.C.,Hodgkiss W.S..浅海鼓虾噪声声源级测量方法[J].声学学报,2020,45(4):535-544. |
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| 作者姓名： | 袁竹清 鄢社锋 Song H.C. Hodgkiss W.S. |
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| 作者单位： | 中国科学院声学研究所水下航行器信息技术重点实验室 北京100190;中国科学院大学 北京 100049;斯克里普斯海洋研究所加州大学圣地亚哥分校 美国92093-0238 |
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| 基金项目： | 国家自然科学基金项目(61431020,61725106)资助 |
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| 摘 要： | 鼓虾噪声是声源级高、频带宽的冲激噪声,对浅海高频声呐和水下通信系统有很强干扰。本文针对实地测量鼓虾噪声声源级存在的多径传播和随机多声源问题,提出一种自动测量实际海域中鼓虾噪声声源级的方法。基于匹配场思想,在一个大孔径垂直线阵上对近场的大量鼓虾噪声进行自动定位。利用鼓虾噪声的强冲激特性,使用阈值检测的方法获得鼓虾信号的到达时间,同时将其幅度进行归一化,解决了各声源幅度动态范围相差大的问题。利用射线理论计算近场直达波到达时间作为拷贝场,对数据进行球面波波束形成,解决近场多途多声源定位问题。通过定位结果将接收鼓虾信号的峰峰值声压换算到距离声源1 m处,计算峰峰值声源级。在东海测量的结果显示,该海域的鼓虾噪声峰峰值声源级平均值为173 dB re: 1μPa@1 m,50%的测量值在168~175 dB re: 1μPa@1 m之间。
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| 收稿时间： | 2019-03-11 |
Source level estimation of snapping shrimp sounds in shallow water environment |
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| Affiliation: | 1 Key Labomtory of Information Technology for Aotonomous Underwater Vehicle, Institute of Acoustics, Chinese Academy of Sciences Beijing 100190;2 University of Chinese Academy of Sciences Beijing 100049;3 Scripps Institution of Oceanography, UCSD, La Jolla California 92093-0238, USA |
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| Abstract: | Snapping shrimp noise,with high source level and broadband spectrum,can disrupt the operation of sonar and underwater acoustic communication systems.To solve the multi-path and multi-source problem in estimating in situ source level of snapping shrimp noise,a method of automatically estimating source level of snapping shrimp noise is developed.A large-aperture vertical line array is used to locate individual snaps in the near field based on matched-filed processing.As the snaps are strong and transient,the threshold detection method is used to obtain the arrival time of the snapping shrimp signals,then the amplitude is normalized to solve the multi-source problem with large dynamic range.Arrival time structure of the direct path is calculated using ray theory as replicas to match with the data using spherical-wave beamforming.The source level is then calculated using the localization results and the original snapping shrimp sounds.The average peak-to-peak source level of snapping shrimp noise measured in East China Sea is 173 dB re: 1μPa@1 m,with an interquartile range of 168~175 dB re: 1μPa@1 m. |
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