Abstract
SACLANTCEN is sponsoring a program entitled Sound Oceanography and Living Marine Resources Program, whose objective is to demonstrate dual use technology for passive detection and localization of marine mammals, which will assist in the implementation of acoustic risk mitigation policies when using high-power acoustic sources. A sea trial was conducted in August 1999 to evaluate marine mammal detection and localization techniques using a number of advanced passive arrays. Passive, bearing-only data from marine mammal vocalizations received on a towed horizontal line array and target motion analysis are used to localize whale position. The multipath arrival structure of received signals and a ray trace model are used to determine whale range and depth over time. Data from several stations, executed using three deployed vertical line arrays in the vicinity of diving whales, and triangulation of arrivals are used to track whale location in the horizontal plane, while beamforming of the vertical array data is used to track whale depth. Evaluation of these data and techniques will be used to formulate passive procedures for determining the presence of marine mammals prior to activation of high-power acoustic sources.
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