|START||NEW VOL 20||SEARCH||STATISTICS||PAS - GDANSK DIVISION|
pp. 21-26, vol. 2, 1999
Technical University of Gdansk, Gdansk, Poland
J. B. Hedgepeth
BioSonics, Seattle, USA
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.
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© 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)