Modelling the Radar Evaporative Duct

Abstract

A model of the radar evaporative duct is described, based on Monin- Oburkov similarity theory. The similarity functions, Monin-Oburkov stability length and scaling parameters are derived from experimental data. Graphs are presented for duct heights and the number of trapped modes at 10 GHz for a wide range of environmental conditions. The input to any such theoretical model is information about the vertical rate of change of refractive index in the atmosphere and (in the case of surface-based ducts), and the reflectivity of the rough sea surface. The outputs include refractivity profiles and duct height, and the frequency-dependence of trapping expressed as either the number of trapped modes at a given frequency, or the cut-off frequency.

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Document Details

Document Type
Technical Report
Publication Date
Apr 01, 1985
Accession Number
ADA161542

Entities

People

  • M. R. Battaglia

Tags

Communities of Interest

  • Energy and Power Technologies
  • Weapons Technologies

DTIC Thesaurus Topics

  • Algorithms
  • Boundary Layer
  • Computer Programs
  • Department Of Defense
  • Electromagnetic Radiation
  • Equations
  • Experimental Data
  • Frequency
  • Heat Energy
  • Latent Heat
  • Measurement
  • Richardson Number
  • Sea Level
  • Standing Waves
  • Temperature Gradients
  • Turbulent Mixing
  • Wave Phenomena

Readers

  • Atmospheric Science/Meteorology
  • Calculus or Mathematical Analysis
  • Computational Modeling and Simulation