FN Archimer Export Format PT J TI Multispectral and multiangle measurements of acoustic seabed backscatter acquired with a tilted calibrated echosounder BT AF FEZZANI, Ridha BERGER, Laurent LE BOUFFANT, Naig FONSECA, Luciano LURTON, Xavier AS 1:1;2:1;3:1;4:2;5:1; FF 1:PDG-DFO-NSE-ASTI;2:PDG-DFO-NSE-ASTI;3:PDG-DFO-NSE-ASTI;4:;5:PDG-DFO-NSE-ASTI; C1 Inst Francais Rech Exploitat Mer, Underwater Acoust Lab, CS 10070, F-29280 Plouzane, France. Univ Brasilia Gama, Dept Elect Engn, Brasilia, DF, Brazil. C2 IFREMER, FRANCE UNIV BRASILIA GAMA, BRAZIL SI BREST SE PDG-DFO-NSE-ASTI IN WOS Ifremer UPR copubli-int-hors-europe copubli-sud IF 2.482 TC 2 UR https://archimer.ifremer.fr/doc/00704/81634/86089.pdf LA English DT Article CR REM2040 AB A multispectral and multiangle analysis of seabed backscatter intensity has been conducted using data from a calibrated single-beam echosounder (SBES) with five frequency channels deployed over four homogeneous areas with different sediment types in the Bay of Brest (France). The SBES transducers were tilted at incidence angles from 0 degrees to 70 degrees to record the seafloor backscatter angular response at discrete frequencies ranging from 35 to 450 kHz. The recorded backscatter levels were analyzed for their angular dependence (average backscatter strength versus frequency and angle) as well as for their sample statistical distribution. The angle and frequency dependence of the seafloor backscatter obtained using a calibrated SBES can potentially be used to calibrate multibeam systems, and it can also help in elucidating the physical processes of backscatter controlled by the interaction between the acoustic wave characteristics and the sediment properties. Backscatter measurements for each area showed a consistent frequency dependence with little variation between the four sediment types. PY 2021 PD JUL SO Journal Of The Acoustical Society Of America SN 0001-4966 PU Acoustical Soc Amer Amer Inst Physics VL 149 IS 6 UT 000665104800001 BP 4503 EP 4515 DI 10.1121/10.0005428 ID 81634 ER EF