Investigation and Development of VHF Ground-Air Propagation Computer Modeling Including the Attenuating Effects of Forested Areas for Within-Line-of-Sight Propagation Paths.

Abstract

An investigation into short-distance (5-100 nm), air-ground, VHF propagation computer models is presented. An evaluation of existing propagation models is afforded by measured signal strength data, collected for this study, obtained for a variety of propagation paths; this evaluation shows existing models to be deficient due to their incapability to calculate attenuation caused by trees for within-line-of-sight propagation paths. The theory behind, and the development of, a computer model that does successfully account for tree attenuation is discussed and documented. A complete description of signal strength data collection is given detailing measurement equipment, site conditions, and data reduction. (Author)

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Document Details

Document Type
Technical Report
Publication Date
Mar 01, 1981
Accession Number
ADA111719

Entities

People

  • Kent A. Chamberlin

Organizations

  • Ohio University

Tags

Communities of Interest

  • Air Platforms
  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Communication Systems
  • Complex Variables
  • Computer Programs
  • Coordinate Systems
  • Diffraction
  • Earth Models
  • Electric Fields
  • Electrical Properties
  • Electromagnetic Fields
  • Electromagnetic Radiation
  • Fresnel Zones
  • Geometry
  • Plastic Explosives
  • Scattering
  • Test And Evaluation
  • Three Dimensional
  • Two Dimensional

Readers

  • Computational Modeling and Simulation
  • Radar Systems Engineering.
  • Systems Analysis and Design