Classification of fish schools based on acoustic features associated with tilt angle

M. Ito, I. Matsuo, T. Imaizumi, T. Akamatsu, Y. Wang, Y. Nishimori
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引用次数: 1

Abstract

It is required to monitor fish species and amount in order to save marine resources. In the current study, broadband split-beam echo sounder was used to survey fish resources. The echo sounder was useful to track individual fish in schools because individual fish echoes in the schools could be separately measured and three dimensional positions of the echoes could be accurately estimated. It is well known that the acoustic features of fish echoes are closely related to the body length and the apparent tilt angle of a fish. The tilt angle could be estimated by individual tracking. Echoes from fish schools were measured for several hours in the ocean. Echo signals were gathered into one block within a certain depth and a period of time and analyzed to track individual fish in the schools. Target strength was calculated from the individual fish echo and associated with the tilt angle, which was estimated by the individual tracking result. The feature in each block was statistically calculated by averaging target strengths based on the tilt angles. The blocks of the signals were classified by K-means method with the features and divided into some clusters. As a result of the clustering, fish schools in the blocks could be classified. The distribution of the clusters was dependent on both time and depth.
基于与倾斜角度相关的声学特征的鱼群分类
为了节约海洋资源,需要监测鱼类的种类和数量。本研究采用宽带分波束测深仪对鱼类资源进行调查。回声测深仪可以单独测量鱼群中单个鱼的回波,并且可以准确地估计回波的三维位置,因此对鱼群中单个鱼的跟踪非常有用。众所周知,鱼的回声声学特征与鱼的体长和视倾斜角密切相关。倾斜角可以通过个体跟踪来估计。在海洋中测量了几个小时的鱼群的回声。在一定深度和一段时间内,将回声信号收集成一个块,并对其进行分析,以跟踪鱼群中的单个鱼。目标强度由单个鱼回波计算,并与倾斜角相关联,倾斜角由单个跟踪结果估计。根据倾斜角平均目标强度,统计计算每个块的特征。利用K-means方法对信号块进行特征分类,并将其划分为若干类。通过聚类,可以对街区内的鱼群进行分类。簇的分布依赖于时间和深度。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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