Signal processing for quantifying and classifying sonar target

Underwater acoustic instrument was used to quantify the fish backscattering strength (SV) and bottom scattering (SS). The measured SS by the bottom echo integration method are compared with the result from the ring surface scattering (RSS) model to confirm the reliability of the measurements and theory. The bottom material estimated by the quantified SS show that the fish schools are abundant in the sand bottom. It is found the acoustic instrument can identify fish, plankton and bottom fish habitats remotely.