The theory of acoustic surveys for determining fish abundance are well established in fishery acoustics. The origins of the estimation are related to overcoming the problem of unknown position of target in the beam using statistical inversion. Although recently researchers use more sophisticated echosounders that provides more informative data allowing for direct solution it is known that the results are biased due to not ideally conical shape of beam pattern function. Performing acoustic surveys in shallow waters may present many challenges. In the paper the problems of statistical inversion of single-beam data are considered mainly by discussing two specific aspects, i.e. the problem of collecting signals from large targets in the beam side-lobes, and moreover the problem of collecting echoes from the same target several times including main-lobe and side-lobe observations. As a result of theoretical considerations new formulae of beam pattern PDF (the kernel of inversion algorithm) recommended for shallow water surveys is proposed.
Authors
Additional information
- Category
- Publikacja monograficzna
- Type
- rozdział, artykuł w książce - dziele zbiorowym /podręczniku w języku o zasięgu międzynarodowym
- Language
- angielski
- Publication year
- 2013
