Whispering Gallery Effects in the Troposphere

Abstract

Experimental data that recorded higher-than-expected signals at 3087. 7 MHz far beyond the horizon in the presence of an elevated duct are examined and compared to results from the radio physical optics (RPO) propagation model. RPO is a range-dependent hybrid model that combines ray optics and parabolic equation methods. Previous modeling of this same case study using waveguide methods for both the measured elevated duct and hypothetical evaporation ducts has been disappointing. However, when the elevated duct is allowed to rise slowly with increasing range, the RPO results closely match the observed signal levels, indicating that weakly attenuated Earth-detached, or whispering gallery, modes were the dominant propagation mechanisms.

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Document Details

Document Type
Technical Report
Publication Date
Dec 01, 1992
Accession Number
ADA262932

Entities

People

  • H. V. Hitney

Organizations

  • Naval Command, Control and Ocean Surveillance Center

Tags

Communities of Interest

  • Air Platforms
  • C4I
  • Energy and Power Technologies
  • Materials and Manufacturing Processes

DTIC Thesaurus Topics

  • Antennas
  • Case Studies
  • Command And Control
  • Earth Models
  • Electromagnetic Wave Propagation
  • Environment
  • Equations
  • Evaporation
  • Losses
  • Measurement
  • Models
  • New York
  • Ocean Surveillance
  • Optics
  • Radio Waves
  • Remote Sensing
  • Transmitters

Fields of Study

  • Physics

Readers

  • Mathematics or Statistics
  • Wave Propagation and Nonlinear Chaotic Dynamics.