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The use of active sonar to study cetaceans

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Figure

Figure 2.9: schematic example of the unwanted effect that could be generated by side lobes. Ghost echoes which do not originate from targets within the main lobe usually show up near to the rising slope of the bottom hit by a side lobe. 
Figure vamplitude,3.2: Range compensation by TVG for a single target. The term v1(t) is the uncompensated signal proportional to the echo  and a(t) the receiver gain that increases with time. This generates the compensation that makes the output v(t) = a(t) 1(t) range independent. This is the so called ’40 log R’ TVG. 
Figure 3.11 and Table 3.1. 
Figure poston4.9: Sonar screen capture of a dedicated MATLAB application written by Matteo Bernasconi and Ruben Patel to monitor the processing of the SH80 calibration data. On the left side of the window the raw data are visualized in the omnidirectional view, the right side selected beams are observed in terms of power spectra. 
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