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首页> 外文期刊>ICES Journal of Marine Science >New broadband methods for resonance classification and high-resolution imagery of fish with swimbladders using a modified commercial broadband echosounder
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New broadband methods for resonance classification and high-resolution imagery of fish with swimbladders using a modified commercial broadband echosounder

机译：使用改进的商业宽带回声测深仪对带有泳囊的鱼进行共振分类和高分辨率成像的新宽带方法

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摘要

A commercial acoustic system, originally designed for seafloor applications, has been adapted for studying fish with swimbladders. The towed system contains broadband acoustic channels collectively spanning the frequency range 1.7-100 kHz, with some gaps. Using a pulse-compression technique, the range resolution of the echoes is ～20 and 3 cm in the lower and upper ranges of the frequencies, respectively, allowing high-resolution imaging of patches and resolving fish near the seafloor. Measuring the swimbladder resonance at the lower frequencies eliminates major ambiguities normally associated with the interpretation of fish echo data: (ⅰ) the resonance frequency can be used to estimate the volume of the swimbladder (inferring the size of fish), and ( ⅱ) signals at the lower frequencies do not depend strongly on the orientation of the fish. At-sea studies of Atlantic herring demonstrate the potential for routine measurements of fish size and density, with significant improvements in accuracy over traditional high-frequency narrowband echosounders. The system also detected patches of scatterers, presumably zooplankton, at the higher frequencies. New techniques for quantitative use of broadband systems are presented, including broadband calibration and relating target strength and volume-scattering strength to quantities associated with broadband signal processing.
机译：最初设计用于海底应用的商业声学系统已被改编为用于研究带有泳囊的鱼类。拖曳系统包含宽带声波通道，这些通道共同跨越了1.7-100 kHz的频率范围，并存在一些间隙。使用脉冲压缩技术，在频率的较低和较高范围内，回波的距离分辨率分别为〜20和3 cm，从而可以对海底附近的斑块和鱼类进行高分辨率成像。在较低频率下测量泳囊共振可消除通常与鱼回波数据解释相关的主要歧义：（ⅰ）共振频率可用于估计泳囊的体积（推断鱼的大小），以及（ⅱ）信号在较低的频率下，与鱼的方向无关。大西洋鲱鱼的海上研究表明，有可能对鱼类的大小和密度进行常规测量，与传统的高频窄带回声测深仪相比，其准确性显着提高。该系统还以较高的频率检测到了散射体，大概是浮游动物。提出了定量使用宽带系统的新技术，包括宽带校准以及将目标强度和体积散射强度与与宽带信号处理相关的数量相关联。

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  • 来源
    《ICES Journal of Marine Science》 |2010年第2期|365-378|共14页
  • 作者

    Timothy K. Stanton; Dezhang Chu; J. Michael Jech; James D. Irish;

  • 作者单位

    Department of Applied Ocean Physics and Engineering, Woods Hole Oceanographic Institution, Woods Hole,MA 02543-1053, USA;

    Department of Applied Ocean Physics and Engineering, Woods Hole Oceanographic Institution, Woods Hole,MA 02543-1053, USA NOAA/NMFS/NWFSC/FRAMD, Montlake Blvd., East Seattle, WA 98112, USA;

    NOAA Northeast Fisheries Science Center, Woods Hole, MA 02543, USA;

    Department of Applied Ocean Physics and Engineering, Woods Hole Oceanographic Institution, Woods Hole,MA 02543-1053, USA.;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    acoustic scattering; broadband; echosounder; fish; resonance;

    机译：声散射宽带回声鱼;谐振;

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