Small boat localization using adaptive three-dimensional beamforming on a tetrahedral and vertical line array
Date of Original Version
Passive acoustic detection and localization of small surface craft has a number of practical applications, such as monitoring and protecting sensitive marine habitats. Moored passive equipment can be cumbersome to deploy and communicate with, so AUV-mounted devices are being investigated as an alternative. The GLASS'12 experiment was designed to assess the feasibility of using a hybrid autonomous underwater vehicle outfitted with a compact volumetric nose array as a data collection platform. The array consisted of 5 vertical elements and 4 in a tetrahedral arrangement, and the hybrid underwater vehicle had the capability operating in either glider or propeller-driven modes. The rigid design of the array minimized element location mismatch, and enabled the use of aggressive adaptive beamforming in 3-D. This facilitated isolation of broadband multipath arrivals originating from the motor of a small rubber boat. Cross-correlation of beams enabled the time-lag between the arrivals to be measured, which, in turn yielded information about the target range. The underlying formulation bears similarity to the passive fathometer [J. Acoust. Soc. Am. 120 (3) 2006] which exploits surface wave noise rather than ship noise. This presentation will focus on the array beamforming and potential applications for localization and environmental sensing. © 2013 Acoustical Society of America.
Proceedings of Meetings on Acoustics
Gebbie, John, Martin Siderius, Peter L. Nielsen, James H. Miller, Steven Crocker, and Jennifer Giard. "Small boat localization using adaptive three-dimensional beamforming on a tetrahedral and vertical line array." Proceedings of Meetings on Acoustics 19, (2013). doi:10.1121/1.4800565.