Abstract
High-frequency sonobuoy arrays with vertical aperture were developed and tested to exploit the noise anisotropy for enhanced array gain [Ferat and Arvelo, J. Acoust. Soc. Am. 114, 2462–2463 (2003)]. Afterwards, an inexpensive and conformal piezoelectric wire material was employed in the design and construction of a volumetric array [Arvelo et al., J. Acoust. Soc. Am. 116, 2650 (2004)]. However, detection performance of air-deployed sonobuoys is severely affected by noise interference through the beamformers sidelobes. An improved sonobuoy system design with in-buoy processing for sidelobe suppression is introduced and its detection performance in anisotropic wind noise with nearby shipping interference is evaluated and compared against previous designs in selected environmental conditions. The high-frequency array gain for increased vertical aperture will be compared against the gain for increased horizontal aperture to explore coherence limitations. The effects of array tilt, as well as interelement amplitude, phase, and topology errors, on the performance deterioration of the new design will also be addressed. [This effort is supported by the Maritime Sensing (MS) Program of the Office of Naval Research (ONR Code 321).]
Published Version
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