Effects of Noise and Absorption on High Frequency Measurements of Acoustic-Backscatter from Fish

Figure 4

Universal diagram of echosounder performance for single fish echoes. The SNR for a single fish echo (TS = −40 dB) is plotted as a function of frequency for parameters of range, , transducer radius, , and beam width, Θ, as shown in the 400 m range panel. Roughly appropriate regions where SNR > 20 dB, Θ > 7°, and  cm are shaded.