Surface-induced errors in target strength and position estimates during horizontal acoustic surveys

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60077344%3A_____%2F17%3A00479371" target="_blank" >RIV/60077344:_____/17:00479371 - isvavai.cz</a>
Alternative codes found
RIV/60076658:12310/17:43895576
Result on the web
<a href="http://dx.doi.org/10.1016/j.fishres.2016.12.017" target="_blank" >http://dx.doi.org/10.1016/j.fishres.2016.12.017</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1016/j.fishres.2016.12.017" target="_blank" >10.1016/j.fishres.2016.12.017</a>

Result language
angličtina
Original language name
Surface-induced errors in target strength and position estimates during horizontal acoustic surveys
Original language description
Horizontally-aligned, fixed and mobile, transducers are routinely deployed at depths of 0.5-0.75 m to survey the surface layer of waterbodies for fish. However, simulations and measurements demonstrate that a smooth surface can cause serious errors in the target strength (TS) and split-beam angular position estimates. Errors in TS up to 10 dB and depth position up to 0.5 m were observed. Simulations suggested that multi-path signal propagation interfered with the direct path of that signal. Furthermore, when a standard target (calibration copper sphere) was moved away from the transducer at fixed depths, the estimated TS and depth of the target started to oscillate as a function of range. The amplitude increased with increasing range. The frequency decreased from the oscillation start until a certain range where the oscillation stopped. The region of oscillation depended on both the transducer and target depth. Horizontal observations of known fish echoes behaved similarly. Experiments in a lake showed that the influence from the surface disappeared when the surface became rippled due to wind.
Czech name
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Czech description
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Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
40103 - Fishery

Project
Result was created during the realization of more than one project. More information in the Projects tab.
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year
2017
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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