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Graduate Student-Faculty Seminars
Monday, April 3, 4:00 pm
Cullimore Hall Room 611
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Inverse Problems in Underwater Acoustics
Eliza
(Z.-H.) Michalopoulou
Department of Mathematical Sciences
New Jersey Institute of Technology
Abstract
Matched field processing (MFP) is
often employed to address source localization problems in the ocean. MFP relies on the calculation of replica
fields for likely source locations, by solving the Helmholtz
equation. Replicas are then correlated to
the true sound field; the source location estimates are those location values
that maximize the correlation. In the
same manner, MFP can be used to estimate parameters other than location that
affect underwater sound propagation. In
practice, since the propagation medium is usually only approximately known, MFP
can be used for the simultaneous estimation of source location and
environmental parameters. The estimation procedure, thus, becomes
multi-dimensional, and exhaustive implementation is computationally
inefficient. Instead, global optimization methods are employed in order to
search efficiently the objective function (measure of correlation between data
and replicas).