Title :
Exact Simulation of Fish School Echoes and its Applications
Author :
Furusawa, Masahiko ; Amakasu, Kazuo
Author_Institution :
Tokyo Univ. of Marine Sci. & Technol., Tokyo
Abstract :
A numerical simulation method was developed to investigate fish school echoes. The simulation incorporates strict expressions for fish target strength model, directivity of a transducer, and echo waveform in order to realize high fidelity. The fish school echoes are constructed by synthesizing single echoes for each ping. Two application examples are shown. One is the confirmation of linearity between the distribution density offish and the simulated volume backscattering strength; the result showed a very good linear relationship. The other example is fish school feature extraction by the wavelet analysis. In the results, no apparent one-to-one correspondence between the given distribution pattern and the results of the wavelet analysis ,but a characteristic wavelet pattern is observed.
Keywords :
feature extraction; oceanography; underwater sound; echo waveform; feature extraction; fish distribution density; fish school echoes; fish target strength model; numerical simulation method; transducer directivity; volume backscattering strength; wavelet analysis; Analytical models; Backscatter; Computational modeling; Computer simulation; Educational institutions; Feature extraction; Marine animals; Numerical simulation; Sea measurements; Wavelet analysis;
Conference_Titel :
OCEANS 2008 - MTS/IEEE Kobe Techno-Ocean
Conference_Location :
Kobe
Print_ISBN :
978-1-4244-2125-1
Electronic_ISBN :
978-1-4244-2126-8
DOI :
10.1109/OCEANSKOBE.2008.4530917
