AN INVERSE METHOD FOR RECONSTRUCTING THE DENSITY AND SOUND SPEED PROFILES OF A LAYERED OCEAN BOTTOM

Authors
  1. Thomson, D.J.
Corporate Authors
Defence Research Establishment Pacific, Victoria BC (CAN)
Abstract
A standard inverse problem in underwater acoustics is the reconstruction of the ocean subbottom structure (e.g., the density and sound speed profiles) from an aperture- and bandlimited knowledge of the reflection coefficient. In the paper we describe and inverse solution method due to Candel et al. which is based on the scattering of acoustic plane waves by a one-dimensional inhomogeneous medium. As a consequence of applying the forward scattering approximation to a local wave representation of the acoustic field, they obtain an expression for the reflection coefficient in the form of a nonlinear Fourier transform of the logarithmic derivative of the local admittance. Inversion of this integral transform enables the recovery of the admittance profile via the numerical integration of two first-order differential equations which require as reflection data a single impulse response of the medium. TRUNCATED
Date of publication
15 Jan 1984
Number of Pages
8
Reprinted from
IEEE J of Oceanic Engineering, vol OE-9, no 1, 1984, p 18-25
DSTKIM No
88-04277
CANDIS No
57482
Format(s):
Hardcopy;Originator's fiche received by DSIS

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