Ray Structure of Ducted Multipath for an LOS Link.

Abstract

This report describes the geometric optic analysis of a duct model for line-of-sight (LOS) fading. The atmospheric refractive index is molded by three linear segments so as to form an elevated duct. The earth's curvature is taken into account by using the modified refractive index. Simple approximate formula are developed for the number of geometric-optic rays received for a given link length. In addition, the angle of departure from the transmitter of these rays is calculated. The angles enable one to readily calculate the amplitude and phase of contributing rays. To gain insight into the structure of the ray families, the trajectories of trapped rays are plotted. We have found that two cusps exist, each cusp having two caustics associated with it. (Author)

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Document Details

Document Type
Technical Report
Publication Date
May 01, 1978
Accession Number
ADA055994

Entities

People

  • R. H. Lang

Organizations

  • Syracuse University

Tags

Communities of Interest

  • Biomedical
  • Energy and Power Technologies
  • Weapons Technologies

DTIC Thesaurus Topics

  • Air Force
  • Amplitude
  • Atmospheric Motion
  • Boltzmann Equation
  • Carrier Frequencies
  • Caustics
  • Computer Science
  • Differential Equations
  • Electrical Engineering
  • Engineering
  • Equations
  • Frequency
  • Frequency Domain
  • Line Of Sight
  • Partial Differential Equations
  • Refractive Index
  • Wave Equations

Fields of Study

  • Physics

Readers

  • Astronomy and Astrophysics.
  • Atmospheric Science / Meteorology, specifically Wind Wave Turbulence.
  • Electromagnetic Wave Scattering and Antenna Radiation Engineering