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首页> 外文期刊>ICES Journal of Marine Science >The relative frequency response derived from individually separated targets of northeast Arctic cod (Gadus morhua), saithe (Pollachius virens), and Norway pout (Trisopterus esmarkii)
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The relative frequency response derived from individually separated targets of northeast Arctic cod (Gadus morhua), saithe (Pollachius virens), and Norway pout (Trisopterus esmarkii)

机译：从东北鳕鱼（Gadus morhua），赛特（Pollachius virens）和挪威p鱼（Trisopterus esmarkii）的单独分离目标得出的相对频率响应

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The concept of relative frequency response r(f) of fish is an important feature used to characterize acoustic targets. It is defined as the volume-backscattering coefficient at a specific frequency/ relative to that of a reference frequency. When based on volume backscat-tering, r(f) reliably distinguishes several acoustic categories if the insonified volumes are reasonably comparable between the frequencies, and that enough samples and targets are measured to constrain stochastic variations in the data within acceptable limits. Therefore, r(f) distinguishes different fish species with swimbladders poorly if they appear as single targets. Using target-strength (TS) data, the acoustic measurements are more spatially comparable, and averaging the TS over an echotrace of a single fish improves the ability to distinguish between different species. Frequency response was estimated using TS data from in situ measurements, collected using Simrad EK60 echosounders with split-beam transducers transmitting simultaneously at 18, 38, 70, 120, and 200 kHz. Selected series with nearly pure catches of northeast Arctic cod (Gadus morhua), saithe (Pollachius virens), and Norway pout (Trisopterus esmarkii) were analysed using a target-tracking algorithm. The frequency response of northeast Arctic cod and saithe did not differ significantly, but at high frequencies, the response of both northeast Arctic cod and saithe differed from that of Norway pout. However, in the latter case, northeast Arctic cod and saithe could be separated, because of their different TS magnitudes.
机译：鱼的相对频率响应r（f）的概念是用于表征声学目标的重要特征。它被定义为相对于参考频率在特定频率下的体积后向散射系数。当基于音量后向散射时，如果所声化的音量在两个频率之间具有合理的可比性，并且可以测量足够的样本和目标以将数据的随机变化限制在可接受的范围内，则r（f）可以可靠地区分多个声学类别。因此，r（f）如果将单个鱼标为目标，则很难区分不同种类的鱼。使用目标强度（TS）数据，声学测量结果在空间上更具可比性，并且在一条鱼的回声迹线上对TS取平均值可以提高区分不同种类的能力。频率响应是使用来自现场测量的TS数据估算的，该数据是使用Simrad EK60回声测深仪收集的，并带有以18、38、70、120和200 kHz同时传输的分束式换能器。使用目标跟踪算法分析了东北鳕鱼（Gadus morhua），赛特（Pollachius virens）和挪威p鱼（Trisopterus esmarkii）的近乎纯捕获量的选定系列。东北北极鳕鱼和saithe的频率响应没有显着差异，但在高频下，东北北极鳕鱼和saithe的响应与挪威p嘴的响应不同。但是，在后一种情况下，东北北极鳕鱼和赛德羚可以分开，因为它们的TS量不同。

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