Abstract
Low-power data acquisition systems have attained sampling rates large enough to enable multielement hydrophone arrays to be deployed autonomously, at the cost of reducing the individual sampling rate per phone. This paper discusses what theoretical advantages bandlimited multielement recordings can provide over single-hydrophone data, including array gain for increased detection range, interfering noise source rejection, environmental inversion, and biological source tracking. These points are illustrated with data collected from an autonomous four-element vertical array off Queensland, Australia in 2003, and data collected from an autonomous eight-element, 21 m aperture vertical array deployed at 35 m depth in the Beaufort Sea in 2008. These examples also provide insight into the technical and logistical challenges required by such deployments, including deployment and recovery systems that do not endanger or entangle array cables. [Work supported by NPRB, logistics provided by Greeneridge Sciences and Shell Co.]
Published Version
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