Abstract
In this paper, we analyze the noise recorded in two drifting vertical line arrays (VLAs) deployed 1 km apart, in the area of the Setubal’s underwater canyon off the west coast of Portugal during RADAR’07 sea trial. Automatic Information System (AIS) recordings for this period reveal a major tanker passing by the area, whose acoustic signature is clearly seen in the spectrogram. The influence of the underwater canyon in the recorded spectrograms is discussed by simulations. By cross-correlating and spatially filtering (beamforming) the signals received at the VLAs, a wave front structure is obtained with coherent information from propagating paths traversing both VLAs and respective arrival times. This work is a contribution for application in a passive ocean acoustics framework to the estimation of sound speed perturbations in the water column.
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