Beam steering for a long range acoustic hail andwarning device for maritime applications

Andrew R. Barnard, David Marion Jenkins, Jr., Timothy A. Brungart, Timothy E. McDevitt, Brian L. Kline, Nicholas C. Nicholas

Research output: Contribution to journalArticle

Abstract

A new means for steering the beam of a phased line array, electromechanical steering, is described and applied to a long range Acoustic Hail and Warning Device (AHWD) developed for maritime applications. In electromechanical steering, the array elements pivot individually resulting in elements being off-set and rotated in the desired steered beam/sound projection direction. A digital signal processor is used to align the phase fronts of the elements due to the mechanical offsets. Electromechanical steering has several advantages over the purely electronic steering of the array. The electromechanically steered beams are not subject to the individual element aperture function attenuation that reduces the sound pressure level (SPL) that commonly occurs for electronically only steered beams at large steering angles. Also, the primary lobe distortion and (lower frequency) onset of grating lobes that occur when a beam is steered electronically is absent with electromechanical steering. In short, with electromechanical steering, the SPL and directivity from theAHWD is entirely equivalent to that obtained by rotating the AHWD to the desired angle with a conventional pan and tilt mount but requires much less space and provides for more flexible mounting options including improved system stealth. In addition, a novel type of line array phase shading is presented which allows theAHWD to be electronically switched from directional mode (typical beam steering highly focused mode) to non-directional wide field of regard for applications that require simultaneous ensonification of targets over large lateral angles.

Original languageEnglish (US)
Pages (from-to)1-9
Number of pages9
JournalNoise Control Engineering Journal
Volume59
Issue number1
DOIs
StatePublished - Jan 1 2011

Fingerprint

hail
beam steering
Precipitation (meteorology)
Acoustics
Equipment and Supplies
acoustics
Pressure
warning systems
sound pressure
Acoustic waves
lobes
pivots
directivity
mounting
Digital signal processors
Mountings
central processing units
apertures
attenuation
projection

All Science Journal Classification (ASJC) codes

  • Building and Construction
  • Automotive Engineering
  • Aerospace Engineering
  • Acoustics and Ultrasonics
  • Mechanical Engineering
  • Public Health, Environmental and Occupational Health
  • Industrial and Manufacturing Engineering

Cite this

Barnard, Andrew R. ; Jenkins, Jr., David Marion ; Brungart, Timothy A. ; McDevitt, Timothy E. ; Kline, Brian L. ; Nicholas, Nicholas C. / Beam steering for a long range acoustic hail andwarning device for maritime applications. In: Noise Control Engineering Journal. 2011 ; Vol. 59, No. 1. pp. 1-9.
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Beam steering for a long range acoustic hail andwarning device for maritime applications. / Barnard, Andrew R.; Jenkins, Jr., David Marion; Brungart, Timothy A.; McDevitt, Timothy E.; Kline, Brian L.; Nicholas, Nicholas C.

In: Noise Control Engineering Journal, Vol. 59, No. 1, 01.01.2011, p. 1-9.

Research output: Contribution to journalArticle

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