Highly Directive Array Aperture
Abstract
An apparatus and method is provided that utilizes sonar array discontinuities for increasing the directivity gain of a sonar system by increasing the ratio of trace wavelengths (replicated) to the length of a fixed array aperture. Impedance discontinuities, or blocking masses, are embedded in a matrix material of fixed length to create Bragg scattered longitudinal displacements of a wavelength. The longitudinal displacements are induced by an incident acoustic plane wave. This creates longitudinal replicas of the displacements, shifted in wave number, creating a scaled acoustic trace wavelength. The replicated trace wavelength is sampled and resolved, thereby increasing the directivity gain of a sonar system.
Document Details
- Document Type
- Technical Report
- Publication Date
- Feb 13, 2013
- Accession Number
- ADA602931
Entities
People
- Benjamin A. Cray
Organizations
- Naval Undersea Warfare Center