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首页> 外文期刊>ICES Journal of Marine Science >A method for the possible species discrimination of juvenile gadoids by broad-bandwidth backscattering spectra vs. angle of incidence
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A method for the possible species discrimination of juvenile gadoids by broad-bandwidth backscattering spectra vs. angle of incidence

机译：一种通过宽带后向散射光谱与入射角的关系鉴别少年类动物的物种的方法

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摘要

Measurements were made of the broad-bandwidth (80-220 kHz) acoustic backscattering from free-swimming juvenile gadoids at various orientations and positions in an acoustic beam, under controlled conditions. The experimental apparatus consisted of a stereo-video camera system, a broad-bandwidth echosounder and echo-processor system, a narrowband 120 kHz split-beam echosounder, a large tank, and a fishnet cage. The net cage was centred on the acoustic beams and was virtually transparent, both acoustically and optically. Accurate three-dimensional positions and angular orientations of individual fish were estimated from stereo-images captured synchronously when broad-bandwidth echoes were received from passing fish. Fish positions were also estimated from data collected with a synchronized split-beam echosounder. Software was developed for image analysis and modelling, including calibration, alignment of acoustic and optical-reference frames, and automatic position-fitting of fish models to manually marked fix-points on fish images. The software also performs Fourier spectrum analysis and pulse-shape analysis of broad-bandwidth echoes. Therefore, several measurement series on free-swimming juvenile gadoids were evaluated. The method and data may be used to improve the acoustic identification of fish species and sizes, and thereby improve investigations of spatial prey-predator relationships, and the accuracy and efficiency of acoustic surveys.
机译：在受控条件下，对声束中各个方向和位置上自由游动的青少年类小体进行了宽带（80-220 kHz）声反向散射测量。实验装置包括一个立体摄像机系统，一个宽带回声测深仪和回声处理器系统，一个窄带120 kHz分离光束回声测厚仪，一个大水箱和一个鱼网笼。网笼以声束为中心，在声学和光学上几乎都是透明的。当从掠过的鱼类接收到宽带回波时，根据同步捕获的立体图像估计单个鱼类的准确三维位置和角度方向。鱼类的位置也可以通过使用同步分束式回声测深仪收集的数据来估算。开发了用于图像分析和建模的软件，包括校准，声参考框架和光学参考框架的对齐以及鱼模型到鱼图像上手动标记的固定点的自动位置拟合。该软件还执行宽带回波的傅立叶频谱分析和脉冲形状分析。因此，评估了关于自由游动的青少年类肌体的几个测量系列。该方法和数据可用于改善鱼类种类和大小的声学识别，从而改善对空间捕食者与捕食者关系的调查，以及声学调查的准确性和效率。

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