NDLI: Estimation of ocean-bottom properties by matched-field inversion of acoustic field data

Content Provider	IEEE Xplore Digital Library
Author	Dosso, S.E. Yeremy, M.L. Ozard, J.M. Chapman, N.R.
Copyright Year	1976
Abstract	A method for estimating properties of the ocean bottom such as bathymetry and geoacoustic parameters such as sound speed, density and attenuation, using matched-field inversion is considered. The inversion can be formulated as an optimization problem by assuming a discrete model of unknown parameters and a bounded search space for each parameter. The optimization then involves finding the set of parameter values which minimizes the mismatch between the measured acoustic field and modeled replica fields. Since the number of possible models can be extremely large, the method of simulated annealing, which provides an efficient optimization that avoids becoming trapped in suboptimal solutions, has been used. The matching fields are computed using a normal mode model. In inversions for range-dependent parameters, the adiabatic approximation is employed. This allows mode values to be precomputed for a grid of parameter values and stored in look-up tables for fast reference, which greatly improves computational efficiency. Synthetic inversion examples are presented for realistic range-independent and range-dependent environments.<>
Sponsorship	IEEE Oceanic Engineering Society
Starting Page	232
Ending Page	239
Page Count	8
File Size	1042083
File Format	PDF
ISSN	03649059
Volume Number	18
Issue Number	3
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1993-07-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Acoustic measurements Sea measurements Oceans Oceanographic techniques Acoustic propagation Simulated annealing Inverse problems Optimization methods Attenuation Computational modeling
Content Type	Text
Resource Type	Article
Subject	Ocean Engineering Mechanical Engineering Electrical and Electronic Engineering

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