Accession Number : ADD015656

Title :   Dual-Frequency Receiving Array Using Randomized Element Positions.

Descriptive Note : Patent, Filed 13 Nov 91, patented 1 Dec 92,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : Lockwood, James C

Report Date : 01 Dec 1992

Pagination or Media Count : 4

Abstract : An array for receiving wave energy at a pair of widely spaced frequencies has receiving elements arranged to function as a half-wave array for the lower frequency and as a random array for the higher frequency. A plurality of receiving elements are arranged in an array with the receiving elements having nominal positions spaced apart such that spacing between adjacent nominal positions is approximately one half the wavelength lambda of the wave having the lower frequency. The receiving elements are randomly distributed about their respective nominal positions with each receiving element being within a distance of epsilon lambda omicron of its corresponding nominal position where epsilon is a randomization parameter and lambda omicron is the wavelength of the higher frequency wave.

Descriptors :   *PATENTS, *UNDERWATER ACOUSTICS, *SONAR ARRAYS, *ACOUSTIC WAVES, ARRAYS, ENERGY, FREQUENCY, HIGH FREQUENCY, SONAR TRANSDUCERS, LOW FREQUENCY, DIRECTION FINDING

Subject Categories : Acoustic Detection and Detectors

Distribution Statement : APPROVED FOR PUBLIC RELEASE