| Registro completo |
| Provedor de dados: |
ArchiMer
|
| País: |
France
|
| Título: |
Backscatter calibration of high-frequency multibeam echosounder using a reference single-beam system, on natural seafloor
|
| Autores: |
Eleftherakis, Dimitrios
Berger, Laurent
Le Bouffant, Naig
Pacault, Anne
Augustin, Jean-marie
Lurton, Xavier
|
| Data: |
2018-06
|
| Ano: |
2018
|
| Palavras-chave: |
Calibration
Seafloor backscatter
Multibeam echosounder
Single-beam echosounder
|
| Resumo: |
The calibration of multibeam echosounders for backscatter measurements can be conducted efficiently and accurately using data from surveys over a reference natural area, implying appropriate measurements of the local absolute values of backscatter. Such a shallow area (20-m mean depth) has been defined and qualified in the Bay of Brest (France), and chosen as a reference area for multibeam systems operating at 200 and 300 kHz. The absolute reflectivity over the area was measured using a calibrated single-beam fishery echosounder (Simrad EK60) tilted at incidence angles varying between 0° and 60° with a step of 3°. This reference backscatter level is then compared to the average backscatter values obtained by a multibeam echosounder (here a Kongsberg EM 2040-D) at a close frequency and measured as a function of angle; the difference gives the angular bias applicable to the multibeam system for recorded level calibration. The method is validated by checking the single- and multibeam data obtained on other areas with sediment types different from the reference area.
|
| Tipo: |
Text
|
| Idioma: |
Inglês
|
| Identificador: |
https://archimer.ifremer.fr/doc/00429/54016/57434.pdf
DOI:10.1007/s11001-018-9348-5
https://archimer.ifremer.fr/doc/00429/54016/
|
| Editor: |
Springer
|
| Formato: |
application/pdf
|
| Fonte: |
Marine Geophysical Research (0025-3235) (Springer), 2018-06 , Vol. 39 , N. 1-2 , P. 55-73
|
| Direitos: |
Springer Science+Business Media B.V., part of Springer Nature 2018
info:eu-repo/semantics/openAccess
restricted use
|
|
