XWVG: A Waveguide Program for Trilinear Tropospheric Ducts. Computer Program for Calculating the Signal Levels of EM (Electromagnetic) Waves Propagating over Seawater.

Abstract

XWVG is a reliable waveguide program for calculating the coherent and incoherent mode sum values of the electromagnetic field strength in dB relative to the free space value, for signals propagating in a trilinear tropospheric duct over seawater. XWVG allows for the effects of surface roughness, absorption by atmospheric gases, and the variation of the complex index of refraction of seawater as a function of temperature, salinity, and frequency. XWVG has been successfully used in the frequency range 50 MHz to 94 GHz and should be usable at higher frequencies. XWVG uses the root-finding routine of Shellman and Morfitt to find the complex modes propagating in the duct. This guarantees that all modes with an attenuation rate below a prespecified level will be found. A description of XWVG is provided, along with a complete program listing and sample output. (Author)

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Document Details

Document Type
Technical Report
Publication Date
Jun 30, 1983
Accession Number
ADA133667

Entities

People

  • G. B. Baumgartner Jr

Tags

Communities of Interest

  • Advanced Electronics

DTIC Thesaurus Topics

  • Analytic Functions
  • Asymptotic Series
  • Bessel Functions
  • Complex Numbers
  • Complex Variables
  • Computer Programs
  • Coordinate Systems
  • Dielectric Permittivity
  • Dielectric Properties
  • Differential Equations
  • Eigenvalues
  • Electromagnetic Fields
  • Electromagnetic Wave Propagation
  • Refractive Index
  • Surface Roughness
  • Three Dimensional
  • Wave Propagation

Fields of Study

  • Physics

Readers

  • Linear Algebra
  • Microwave Engineering.
  • Wave Propagation and Nonlinear Chaotic Dynamics.

Technology Areas

  • Space