Anthony W Lyons

US Patent:

20220350021, Nov 3, 2022

Filed:

Mar 5, 2020

Appl. No.:

17/435738

Inventors:

- Durham NH, US
Anthony P. Lyons - Durham NH, US

Assignee:

University of New Hampshire - Durham NH

International Classification:

G01S 15/89
G01S 7/527
G01S 15/10

Abstract:

Techniques are provided for implementing an end-fire synthetic aperture sonar system. A methodology implementing the techniques according to an embodiment includes generating a plurality of matched-filtered signals (pings) based on correlations of a transmitted sonar signal with a plurality of reflected or scattered returns of the transmitted signal received from a hydrophone, the reflected or scattered returns associated with a plurality of locations of the hydrophone relative to a location of a transmitter. The method further includes generating a coarse estimate of the locations of the hydrophone based on incoherent cross correlations of the pings, and generating a refined estimate of the locations of the hydrophone based on the coarse estimate and further based on coherent cross correlations of the pings. The method further includes performing delay-and-sum beamforming to combine the pings, the beamforming employing time delays based on the estimated locations of the hydrophone.