FN Archimer Export Format
PT J
TI Methodological developments for improved bottom detection with the ME70 multibeam echosounder
BT 
AF BOURGUIGNON, Sebastien
   BERGER, Laurent
   SCALABRIN, Carla
   FABLET, Ronan
   MAZAURIC, Valerie
AS 1:1;2:1;3:1;4:2;5:3;
FF 1:PDG-DOP-DCB-STH-LTH;2:PDG-DOP-DCB-NSE-ILE;3:PDG-DOP-DCB-STH-LTH;4:;5:PDG-DGA-DMON;
C1 IFREMER, Ctr Brest, ZI Pointe Diable, F-29280 Plouzane, France.
   Telecom Bretagne, F-29238 Brest 3, France.
   IFREMER, F-92138 Issy Les Moulineaux, France.
C2 IFREMER, FRANCE
   TELECOM BRETAGNE, FRANCE
   IFREMER, FRANCE
   UEB, FRANCE
SI BREST
   SIEGE
SE PDG-DOP-DCB-STH-LTH
   PDG-DOP-DCB-NSE-ILE
   PDG-DGA-DMON
IN WOS Ifremer jusqu'en 2018
   copubli-france
   copubli-univ-france
IF 1.92
TC 6
UR https://archimer.ifremer.fr/doc/2009/publication-6629.pdf
LA English
DT Article
CR IBTS INTERNATIONAL BOTTOM TRAWL SURVEY (IBTS),
   PELGAS 2006
BO Thalassa
DE ;Multibeam echosounder;Fisheries;Bottom detection;Acoustics
AB Multibeam echosounders and sonars are increasingly used in fisheries acoustics for abundance estimation. Because of reduced side-lobe levels in the beam-array pattern, the new Simrad ME70 multibeam echosounder installed on board Ifremer's RV "Thalassa" has been designed to allow improved detection of fish close to the seabed. To achieve this objective, precise and unambiguous detection of the water-bottom interface is required, which raises the issue of bottom detection, especially in the outer beams. The bottom-detection method implemented in the ME70 is based on the amplitude of the reverberated echo. Such an approach is efficient for vertical beams, but less accurate for beams with higher incidence angles, typically 30°–40° for the beam configurations used on RV "Thalassa", where the incidence angle, the beam opening, and the nature of the seabed contribute to weakening the backscattered signal. Therefore, the aim of this study was twofold. First, we proposed to improve the current bottom-detection method based on the amplitude of the echo. Thanks to the split-beam configuration being available for all beams of the ME70, we also proposed to use the phase information in the backscattered signals of the outer beams, as is more commonly done with multibeam systems dedicated to seabed mapping. Then, we set a Bayesian estimation framework that takes into account the spatial continuity between adjacent echoes, giving more robustness to the bottom estimation itself. Results using data collected at sea for various bottom types are presented here.
PY 2009
PD JUN
SO ICES Journal of Marine Science
SN 1054-3139
PU Oxford university press
VL 66
IS 6
UT 000267221600008
BP 1015
EP 1022
DI 10.1093/icesjms/fsp089
ID 6629
ER

EF