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Definition of signal-to-noise ratio and its critical role in split-beam measurements

机译:信噪比的定义及其在分束测量中的关键作用

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The signal-to-noise ratio (SNR) plays a critical role in any measurement but is particularly important in fisheries acoustics where both signal and noise can change by orders of magnitude and may have large variations. "Textbook situations" exist where the SNR is clearly defined, but fisheries-acoustic measurements are generally not in this category as signal and noise come from a wide range of sources that change with location, depth, and ocean conditions. This paper defines the SNR and outlines its measurement using split-beam data. Its effect on target-strength (TS) measurements is explored. Recommendations are given for the routine use of the SNR in fisheries-acoustic measurements. This work also suggests a new equation for TS estimation that is important at low SNR.
机译:信噪比(SNR)在任何测量中都起着至关重要的作用,但在渔业声学中尤为重要,在该领域中,信号和噪声都可能变化一个数量级,并且可能会有很大的变化。存在“教科书情境”,其中明确定义了SNR,但是由于信号和噪声来自随位置,深度和海洋条件而变化的各种来源,因此,渔业声学测量通常不在此类别中。本文定义了SNR,并概述了使用分束数据的测量方法。探索了其对目标强度(TS)测量的影响。建议在渔业声学测量中常规使用SNR。这项工作还提出了用于TS估计的新公式,该公式对于低SNR非常重要。

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