Imaging Marine Fauna with a Tritech Gemini 720i Sonar
Imaging Marine Fauna with a Tritech Gemini 720i Sonar
复制标题
使用 Tritech Gemini 720i 声纳对海洋动物群进行成像
DOI：
10.1007/s40857-016-0076-1
复制
发表时间：
2017
影响因子：
1.7
通讯作者：
I. Parnum
中科院分区：
文献类型：
--
作者：
Miles J. G. Parsons;Edmund Fenny;K. Lucke;S. Osterrieder;Greg Jenkins;B. Saunders;P. Jepp;I. Parnum
多波束声纳系统越来越多地用于探测、量化和监测海洋动物的行为。在几十到几百米的范围内，动物可以被探测到作为目标。然而，在较短的距离（通常$${<}10 \，\hbox {m}$$<10 m）和良好的条件下，高频（$${>}1 \，\hbox {kHz}$$> 1 kHz）声纳系统可以提供高质量的图像，赢得了术语“声学相机”，并已成为特别有利于识别和计数鱼。然而，功率的限制和衰减随频率的显著增加限制了这种声学相机的可实现范围。系统的工作频率介于测绘和渔业声纳（通常为$${<}400\，\hbox {kHz}$$<400 kHz）和声学摄像机（$${\approx }1 \，\hbox {MHz}$$<1 MHz）之间，通常用于短程导航和评估水下结构。虽然这些系统产生的图像的分辨率比声学相机低，但它们也可能能够区分海洋动物群的特征，并在更大的范围内这样做。这项研究利用Tritech Gemini 720 i成像声纳近距离拍摄了14种动物的图像。它评估了一些简单的形态参数，如长度和宽度，并强调了使用这些参数对目标进行分类的可能性。它还粗略描述了与使用这种系统监测海洋动物有关的问题。
Multibeam sonar systems are increasingly used to detect, quantify and monitor behaviour of marine fauna. Over ranges of tens to hundreds of metres, animals can be detected as targets. However, at shorter ranges (typically $${<}10 \, \hbox {m}$$<10m) and in good conditions, high-frequency ($${>}1 \, \hbox {kHz}$$>1kHz) sonar systems can provide high-quality images earning the term ‘acoustic cameras’ and have become particularly advantageous for discriminating and counting fish. However, limitations of power and the significant increase in attenuation with frequency limit the achievable range of such acoustic cameras. Systems that operate at frequencies between those of mapping and fisheries sonar (typically $${<}400\, \hbox {kHz}$$<400kHz) and acoustic cameras ($${\approx }1 \, \hbox {MHz}$$≈1MHz) are often used for short-range navigation and to evaluate underwater structures. While these systems produce images at reduced resolution compared to acoustic cameras, they may also be capable of distinguishing features of marine fauna and do so at greater ranges. This study utilised a Tritech Gemini 720i imaging sonar to produce images from 14 species of fauna at close range. It assessed some simple morphological parameters, such as length and breadth, and highlighted the possibilities of using these to categorise targets. It also provided a coarse description of issues associated with using such a system for monitoring marine animals.