Accession Number : ADA131976

Title :   The Effect of Noisy Reflection Data on an Inverse Method for Determining the Structure of a Layered Ocean Bottom.

Descriptive Note : Technical document,

Corporate Author : NAVAL UNDERWATER SYSTEMS CENTER NEW LONDON CT NEW LONDON LAB

Personal Author(s) : Thomson,David J ; Herstein,Peter D

PDF Url : ADA131976

Report Date : 18 Jul 1983

Pagination or Media Count : 20

Abstract : A basic inverse problem in underwater acoustics is the determination of the structure of the sea bed from a limited knowledge of its reflection coefficient. For many applications, an adequate model for studying the acoustic interaction is provided by the scattering of plane waves by a layered liquid medium. In contrast to formally exact solutions to this inverse scattering problem, Candel, et al., (J. Sound Vib. 68, 571-595 (1980)) developed an approximate scheme which is readily implemented numerically. Under the assumption of nonabsorptive media, the reconstruction of both sediment density and sound-speed profiles is effected by the numerical integration of a system of four first-order differential equations requiring impulse response data for two distinct grazing angles. In this paper, the effect of additive noise on the inversion algorithm is examined for synthetic reflection data generated for a geoacoustic model of deep-sea sediments representative of the Hatteras Abyssal Plain. (Author)

Descriptors :   *Underwater acoustics, *Geoacoustics, *Ocean bottom, Acoustic reflection, Sediments, Density, Profiles, Grazing, Angles, Acoustic velocity, Algorithms, Coefficients, Gaussian noise, Inverse scattering, Differential equations, Numerical integration

Subject Categories : Theoretical Mathematics
      Acoustics

Distribution Statement : APPROVED FOR PUBLIC RELEASE