Progress Report for The Catholic University of America Grant N0OO14-94-1-02O1.

Abstract

The calculations for considering linear sound-speed profiles in channels have been generalized to treat piece-wise linear sound-speed profiles. Calculation of the scattering coefficients for the linear profile was begun. The case of a channel with a complex bottom impedance condition was also under investigation. As a result of the fact that the eigenvalues are now complex, a diffusion-like term has been added to the governing coherence equations. We began studies of methods to calculate the effect of this term since the governing equations can no longer be reduced to a set of ordinary differential equations for cylindrically symmetric sources. The work on the two- frequency coherence equations continued and the conditions for their validity were carefully considered. It was shown that for large normalized frequency differences the governing equations simplified considerably. We also began looking for a suitable asymptotic formulation to determine the effect of the small normalized frequency differences for very long propagation distances.

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Document Details

Document Type
Technical Report
Publication Date
Dec 31, 1995
Accession Number
ADA307862

Entities

People

  • Michael J. Beran

Organizations

  • The Catholic University of America

Tags

Communities of Interest

  • Advanced Electronics

DTIC Thesaurus Topics

  • Acoustic Scattering
  • Data Analysis
  • Difference Equations
  • Differential Equations
  • Eigenvalues
  • Eigenvectors
  • Electrical Engineering
  • Electronic Mail
  • Equations
  • Frequency
  • Impedance
  • Military Research
  • Refractive Index
  • Scattering
  • Shallow Water
  • Three Dimensional
  • Two Dimensional

Readers

  • Approximation Theory.
  • Electromagnetic Wave Scattering and Antenna Radiation Engineering
  • Fluid Dynamics.