Multipath Modelling for Terrestrial VHF Radio Direction Finding,

Abstract

This report details the development of computer models to investigate and explain the effects of multipath on VHF radio direction finding (DF). The motivation for this development was to help explain the large and small scale multipath effects which occur for changes in transmitter and receiver position, or for changes in frequency. Particularly important in the analysis of current wide and narrow band DF approaches and the development of better ones. The new approach is based on representing the terrain and vegetation, which effect the signal path, by a large number of small (relative to the signal wavelength) isotropic reradiators. Polarization effects are not accounted for. Although this kind of approach can quickly become a computationally daunting task, a number of simplifications are introduced which greatly simplify the calculations. Two examples have been included illustrating the use of the proposed approach in the analysis and modelling real world measurements.

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Document Details

Document Type
Technical Report
Publication Date
Dec 01, 1996
Accession Number
ADA320254

Entities

People

  • William Read

Organizations

  • Defence Research and Development Canada

Tags

Communities of Interest

  • Air Platforms
  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Accuracy
  • Antennas
  • Arrays
  • Computations
  • Coordinate Systems
  • Dielectric Permittivity
  • Direction Finding
  • Electrical Properties
  • Electromagnetic Fields
  • Fresnel Zones
  • Geometry
  • Mathematical Analysis
  • Multipath Transmission
  • National Security
  • Orientation (Direction)
  • Security
  • Signal Processing

Readers

  • Computational Modeling and Simulation
  • Radar Systems Engineering.