Figure 8. The location of target in the beam is estimated from athwartship and alongship angles. The target range to the transducer for different pings is estimated by split-beam echosounder. Spatial track of the target is estimated using Equation ( 3) . The estimated angle between the fish track and the acoustic axis of the transducer is plotted at different ranges. Measured target strength (TS) frequency response at of different pings together with the mean (red) and maximum (blue) TS as a function of frequency are shown. The histogram of the mean and maximum TS frequency responses is plotted.
