Array directivity enhancement by leveraging angle-dependent scattering
Journal Article
·
· Journal of the Acoustical Society of America
- Univ. of Massachusetts, Lowell, MA (United States); Sandia National Laboratories (SNL), Albuquerque, NM, and Livermore, CA (United States)
- Univ. of Massachusetts, Lowell, MA (United States)
The quality of a sonar array's localization capabilities, often expressed as directivity, is limited by the sonar's aperture, that is, the length of the sonar array. Previous attempts to improve directivity, without increasing array size, have been moderately successful. Wave scattering within a nontraditional array, such as an array fabricated from a non-homogeneous material, could provide additional information to the localization calculations and improve array directivity without increasing the size of the array. An investigation of array directivity improvement through wave scattering is performed. This paper modifies existing localization and directivity calculations to consider the scattered waves and uses the derived equations to explain why previous proposed scattering was incapable of increasing directivity. Finally, a scattering relationship capable of enhancing array localization without increasing array size is proposed, and the directivity improvement claims are verified with beamform plot comparisons and directivity index calculations.
- Research Organization:
- Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)
- Sponsoring Organization:
- Naval Engineering Education Consortium; USDOE National Nuclear Security Administration (NNSA)
- Grant/Contract Number:
- AC04-94AL85000; NA0003525
- OSTI ID:
- 1617314
- Report Number(s):
- SAND--2019-14611J; 682506
- Journal Information:
- Journal of the Acoustical Society of America, Journal Name: Journal of the Acoustical Society of America Journal Issue: 3 Vol. 147; ISSN 0001-4966
- Publisher:
- Acoustical Society of AmericaCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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