DESCRIPTION: In recent years the U.S. Navy has researched the utility of deep water (i.e., 6 km depth, 3 deg C temperature) acoustic sensing technologies that exploit the reliable acoustic path (RAP) [1] using vertical line arrays (VLAs) of vector sensors [2,3]. The first RAP VLA array was large and deployed over the side of a research vessel [3]. The sensing nodes consisted of a pressure hydrophone, a triaxial pressure-gradient hydrophone, and an electronics housing all contained within a free-flooding plastic frame having a diameter and length of 13-in x 41-in. The measured acoustic signals were routed to a central node that served as a data recorder. Future arrays will be smaller and deployed from tactical naval platforms using existing packaging modalities
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