Point-source violations: split-beam tracking of fish at close range

被引：22

作者：

Dawson, JJ ^{[1
]}

Wiggins, D ^{[1
]}

Degan, D ^{[1
]}

Geiger, H ^{[1
]}

Hart, D ^{[1
]}

Adams, BA ^{[1
]}

机构：

[1] BioSon Inc, Seattle, WA 98107 USA

来源：

AQUATIC LIVING RESOURCES | 2000年 / 13卷 / 05期

关键词：

split-beam; point-source; fish tracking; positional estimates;

D O I：

10.1016/S0990-7440(00)01077-9

中图分类号：

S9 [水产、渔业];

学科分类号：

0908 ;

摘要：

Split-beam positional estimates of fish detected in a river at close range often do not correspond to the actual position of the target. These inaccuracies create problems in determining whether a fish is moving upstream or downstream. We hypothesize that these positional estimates are degraded by two factors: size of target relative to beam diameter, and the complex scattering of the fish. These parameters create a near-held effect, within which the phase measurements of the returning echoes are corrupted. Examples of fish tracks from near and far range fish detected by a split-beam echo sounder an provided to illustrate these inaccuracies. Experimental data from tethered spheres and complex targets show Increasing distortion with target complexity and proximity to the transducer. (C) 2000 Ifremer/CNRS/INRA/IRD/Cemagref/Editions scientifiques et medicales Elsevier SAS.

引用

页码：291 / 295

页数：5