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:

1990-08-28

Pagination or Media Count:

6.0

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