HYDROACOUSTICS
ANNUAL JOURNAL
START NEW VOL 20 SEARCH STATISTICS PAS - GDANSK DIVISION

Using Single-Beam Observations of Fish Echoes from Sidelobe in Fish Target Strength Estimation

pp. 21-26, vol. 2, 1999

Marek Moszynski
Technical University of Gdansk, Gdansk, Poland

J. B. Hedgepeth
BioSonics, Seattle, USA

Key words:

Abstract: Fish target estimation when using single-beam echosounder data is based on solving integral equation by inverse technique with probability density functions (PDFs) of echo envelope and beam pattern as known variables. Typically - by setting threshold on echo level - on/y main-lobe observation are used due lo difficulties in beam pattern PDF evaluation and signal-to-noise ratio constraints. This paper presents a method that uses side-lobe observations in the beam pattern probability density function and all collected echo peak values. These side-lobe echo observations indifferentiable when using single-beam system are combined with those from main-lobe. The smoothed Expectation Maximization method (EMS) is used to estimate densities and acoustic sizes of fish main-lobe with side-lobe observations.

Download: Fulltext PDF, BibTeX

© Polish Acoustical Society - Gdansk Department, Polish Academy of Sciences. This work is licensed under the Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported. (CC BY-NC-SA 3.0)