A.B. Santos, absantos(atualg.pt
P. Felisberto, pfelis(at)ualg.pt
S.M. Jesus sjesus(at)ualg.pt
LARSys, University of Algarve, Campus de Gambelas, PT-8005-139 Faro, Portugal.
Comments: download pdf file (not available).
Ref.: MTS/IEEE Oceans, Aberdeen, June 2017.
Abstract
Passive sound speed estimation using radiated ship noise is an appealing approach for long-term ocean
observation close to ship lanes. In this paper we analyze the noise recorded in two drifting vertical
line arrays (VLAs) deployed 1 km apart, in Setúbal’s underwater canyon area off the west coast of
Portugal during the RADAR’07 sea trial. Automatic Information System (AIS) recordings for this period
reveal a major tanker passing in the area, with its acoustic signature observed in the spectrogram as
a characteristic striation time-frequency pattern. By cross correlation and beamforming of the received
signals at the VLAs we obtain propagating paths traversing the hydrophones of both VLAs and respective
travel times. Such information is used for sound speed estimation. We discuss the applicability of the
method to track sound speed perturbations using historical sound speed profiles for the area obtained
from CMEMS (COPERNICUS Marine Environment Monitoring Service). This work is a contribution for application
in a passive ocean acoustics framework for the estimation of sound speed perturbations in the water column.
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