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Using shipping noise for sound speed inversion in coastal areas

机译：在沿海地区使用运输噪声进行声音速度反转

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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 Setubal'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.
机译：使用辐射船舶噪声的被动声速估计是一种靠近船舶通道的长期海洋观察的吸引力方法。在本文中，我们分析了在雷达尔'07海洋试验期间在葡萄牙西海岸的塞子水下峡谷区分析了两个漂移的垂直线阵列（VLA）中记录的噪音。这一时期的自动信息系统（AIS）录像显示了在该区域的主要油轮，其在频谱图中观察到的声学特征，作为特征频串时频图案。通过跨相关性和波束成形的VLA处的接收信号，我们获得穿过VLA和相应行进时间的流水声的传播路径。这些信息用于声速估计。我们讨论了使用来自CMEMS（Copernicus Marine环境监控服务）的区域的历史声速曲线跟踪声速扰动的适用性。这项工作是在被动海洋声学框架中申请的贡献，用于估计水柱中的声速扰动。

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