Using single-beam observations off fish echoes from sidelobe in fish target strength estimation

• Autorzy: Moszynski M. , Hedgepeth J. B.
• Konferencja: Proceedings of the 2 nd EAA International Symposium on Hydroacoustics 24-27 May 1999, Gdańsk-Jurata POLAND
• Języki publikacji: EN

Abstrakty

EN

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 envetope and heam pattern as known variabies. Typically - by setting threshold on echo level - only main-tobe observation are used due to difficulties in beam pattern PDF evaluation and signal-to-noise ratio constraints. This paper presents a method that uses side-tobe observations in the beam pattern probability density function and all collected echo peak values. These side-tobe echo observations indifferentiable when using single-beam system are combined with those from main-tobe. The smoothed Expectation Maximization metbod (EMS) is used to estimate densities and acoustic sizes of fish main-tobe with side-tobe observations.

• Wydawca: Polskie Towarzystwo Akustyczne. Oddział Gdański
• Czasopismo: Hydroacoustics
• Rocznik: 1999
• Tom: Vol. 2
• Strony: 21--26
• Opis fizyczny: Bibliogr. 4 poz., rys.

Twórcy

autor

Moszynski M.

• Technical University of Gdansk, ul. Narutowicza 11/12,80-952 Gdansk, POLAND

autor

Hedgepeth J. B.

• BioSonics, Inc., 4027 Leary Way NW. Seattle WA 98107, USA

Bibliografia

• [1] Hedgepeth J.B., Stock assessment with hydroacoustie estimates of abundance via tuning and 26 smoothed EM estimation. University of Washington PhD. dissertation. Seattle WA. 253 pp. (1994)
• [2] Hedgepeth, J.B., V.F. Gallueei, F. O'Sullivan and R.E. Thome. 1999. An expeetation maximization and smoothing approach for indireet acoustic estimation of fish size and density . ICES Journal of Marine Science. Volume 56(1):36-50.
• [3] Moszyński M., Main lobe approximation for the target strength inverse problem. Procedings of the Fourth European Conference on Underwater Acoustics. Rome, Italy, September 21-25 1998.
• [4] Stepnowski A., Comparison of the novel inverse techniques for fish target strength estimation. Procedings of the Fourth European Conference on Underwater Acoustics. Rome, Italy, September 21- 25 1998.