Accession Number : ADD018535

Title :   Method for Doubling the Resolving Power of a Sonar Array and a Sonar Array for Implementing the Same.

Descriptive Note : Patent, Filed 3 Oct 95, Patented 24 Jun 97,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : Zehner, William J

Report Date : 24 Jun 1997

Pagination or Media Count : 9

Abstract : A sonar array which has a resolving power which is double that of conventional sonar arrays includes an array of hydrophones each having an acoustic center, a first projector positioned proximate a first endmost one of the hydrophones for launching a first sound signal during a first transmission time period, a second projector positioned proximate a second endmost one of the hydrophones for launching a second sound signal during a second transmission time period, wherein the hydrophones receive first echo signals and convert the first echo signals into first electrical echo signals during the first transmission time period, and receive second echo signals and convert the second echo signals into second electrical echo signals during the second transmission time period, and a receiver for receiving and storing the first and second electrical echo signals and for coherently summing the stored first and second electrical echo signals, to thereby produce a beam having a half-power beam width which is one-half that of a beam produced by a conventional sonar array. Also disclosed is a method for doubling the resolving power of a sonar array.

Descriptors :   *ACOUSTIC ARRAYS, *SONAR ARRAYS, TRANSMITTANCE, ECHOES, SIGNALS, ELECTRICITY, SOUND, LAUNCHING, ACOUSTICS, HYDROPHONES

Subject Categories : Acoustic Detection and Detectors

Distribution Statement : APPROVED FOR PUBLIC RELEASE