Wideband time-reversal imaging of an elastic target in an acoustic waveguide

Lawrence Carin, Hongwei Liu, Timothy Yoder, Luise Couchman, Brian Houston, Joseph Bucaro

Research output: Contribution to journalArticlepeer-review

21 Scopus citations

Abstract

Time-reversal is addressed for imaging elastic targets situated in an acoustic waveguide. It is assumed that the target-sensor range is large relative to the channel depth. We investigate the theory of wideband time-reversal imaging of an extended elastic target, for which the target dimensions are large relative to the principal wavelengths. When performing time-reversal imaging one requires a forward model for propagation through the channel, and the quality of the resulting image may be used as a measure of the match between the modeled and actual (measured) channel parameters. It is demonstrated that the channel parameters associated with a given measurement may be determined via a genetic-algorithm (GA) search in parameter space, employing a cost function based on the time-reversal image quality. Example GA channel-parameter-inversion results and imagery are presented for measured at-sea data. © 2004 Acoustical Society of America.
Original languageEnglish (US)
Pages (from-to)259-268
Number of pages10
JournalJournal of the Acoustical Society of America
Volume115
Issue number1
DOIs
StatePublished - Jan 1 2004
Externally publishedYes

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