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- W1693432695 abstract "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-field 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 are provided to illustrate these inaccuracies. Experimental data from tethered spheres and complex targets show increasing distortion with target complexity and proximity to the transducer." @default.
- W1693432695 created "2016-06-24" @default.
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- W1693432695 date "2000-10-01" @default.
- W1693432695 modified "2023-10-14" @default.
- W1693432695 title "Dépassements du point-source : suivi des mouvements des poissons à « petite échelle » au sonar." @default.
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- W1693432695 doi "https://doi.org/10.1016/s0990-7440(00)01077-9" @default.
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