Accession Number : ADD014642

Title :   Multiple Frequency Synthetic Aperture Sonar.

Descriptive Note : Patent, Filed 12 Jan 81, patented 28 Aug 90,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : Higgins, Francis J ; Loggins, Chester D , Jr ; Christoff, James T

Report Date : 28 Aug 1990

Pagination or Media Count : 6

Abstract : This patent discloses a dual frequency, synthetic aperture, sonar system includes a transmitter for projecting insonifying pings alternatively at first and second frequencies and a linear receiving array carried by a vehicle so as to receive returns from said pings. The first and second frequency returns are separated and subjected to processing in parallel channels where they are resolved into in-phase and quadrature components for subsequent phase-error correction, coherent addition, and synthetic aperture beamforming. (jhd)

Descriptors :   *PATENTS, *SYNTHETIC APERTURE SONAR, BEAM FORMING, CHANNELS, COHERENCE, DUAL MODE, PARALLEL ORIENTATION

Subject Categories : Acoustic Detection and Detectors

Distribution Statement : APPROVED FOR PUBLIC RELEASE