Horizontal-Gradient Acoustical Ray-Trace Program TRIMAIN

Abstract

Interest has arisen in the last few years to develop analytical models of the undersea acoustic environment which are suitable for use on digital computers. To realistically represent the sound-field structure which exists in the ocean, one must consider the variation of sound speed in two dimensions: depth and range. A computer program, TRIMAIN, was written in Fortran 4 in which the sound-speed field for a given region is divided into triangular segments of the range-and-depth plane. Four types of intensity calculations are available: a completely random phase summation, a completely coherent phase summation, a statistical influence over depth, and an average over a convergence zone. Additional output options are ray depth distributions, ray printplots, and Calcomp ray plots, including plots of input sound speeds and of bathymetric profiles.

Open PDF

Document Details

Document Type
Technical Report
Publication Date
Dec 16, 1974
Accession Number
ADA006254

Entities

People

  • B. G. Roberts Jr.

Organizations

  • United States Naval Research Laboratory

Tags

Communities of Interest

  • Air Platforms
  • C4I

DTIC Thesaurus Topics

  • Acoustics
  • Bottom Loss
  • Computer Programs
  • Computers
  • Convergence
  • Convergence Zones (Sonar)
  • Differential Equations
  • Digital Computers
  • Equations
  • Frequency
  • Grazing Angles
  • Losses
  • Low Angles
  • Nautical
  • Phase Shift
  • Reflection
  • Trajectories

Fields of Study

  • Physics

Readers

  • Acoustical Oceanography.
  • Computer Science.
  • Wave Propagation and Nonlinear Chaotic Dynamics.