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Comparison of target strength (TS) distributions obtained by means of the use of direct and indirect techniques in sea cages
Abstract
The aim of this study is to verify the reliability of a processing application developed for the indirect measurement of target strength (TS), with a view to the integration into a single-beam system for its utilization in fish farms. Dorsal and ventral measurements are carried out for gilt-head sea-bream (Spams Aurata) for 5 size classes using a split-beam EK60 echosounder and single-beam data obtained from one of the channels from the echosounder. Data measured using single-beam system lacks information about the relative position of (he target on the transducer's beam, making it necessary to use inverse techniques to eliminate the dependence of TS with the beam pattern of the transducer. Among the various existing techniques, the adaptive maximization, expectation and smoothing method is one that achieves results similar to those obtained using direct methods, implemented in split-beam systems. Firstly, the comparison is made between uncompensated target strength (TSu) distributions from EK60 echosounder regardless of the phase information, checking the proper functioning of the first part of processing application. Secondly, comparing TS distribution from the analysis made with the single-beam data with that obtained using the split-beam echo-sounder EK60, designed for direct TS estimation, with the purpose of assessing the reliability of a low-cost system for indirect TS estimation in sea cages.
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- Category:
- Conference activity
- Type:
- publikacja w wydawnictwie zbiorowym recenzowanym (także w materiałach konferencyjnych)
- Title of issue:
- Proceedings of the 10th European Conference on Underwater Acoustics : ECUA 2010 : Vol. 1, Istambul, Turkey, July 5-9, 2010 strony 37 - 42
- Language:
- English
- Publication year:
- 2010
- Bibliographic description:
- Cebrecos A., Soliveres E., Espinosa V., Moszyński M.: Comparison of target strength (TS) distributions obtained by means of the use of direct and indirect techniques in sea cages// Proceedings of the 10th European Conference on Underwater Acoustics : ECUA 2010 : Vol. 1, Istambul, Turkey, July 5-9, 2010/ ed. ed. T. Akal. - Sualti Sistemleri Teknoloji Gelistirme. Kocaeli: Istanbul Ofset Basim Yayin A.S., 2010, s.37-42
- Verified by:
- Gdańsk University of Technology
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