Profile Sampling Dependence of the MLAYER Program

Abstract

The dependence of the predictions of the MLAYER program on the set of heights at which the refractive index value are sampled from a fixed reference profile are analyzed. A refractivity profile with a four-meter evaporation duct is adopted as a reference. Two variable piecewise linear profiles of four and five segments, respectively, are used to approximate the reference profile for MLAYER computations. The sensitivities of the waveguide mode location, the range attenuation rate, and the height-gain function to the changes of the piece-wise linear profiles are investigated at the frequencies 3, 6, 10, and 15 GHz. The frequency dependence of the dominant mode for one profile is also studied to investigate the fact that the sensitivity to changes in sampling point location is lower at GHz than at other frequencies. A general rule-of-thumb for the change in range attenuation rate due to a slight change in refractivity is suggested.

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Document Details

Document Type
Technical Report
Publication Date
Mar 01, 1991
Accession Number
ADA242450

Entities

People

  • Ting-hsun Chang

Organizations

  • Naval Postgraduate School

Tags

Communities of Interest

  • Air Platforms

DTIC Thesaurus Topics

  • Attenuation
  • Classification
  • Computations
  • Electromagnetic Radiation
  • Electromagnetic Wave Propagation
  • Environment
  • Equations
  • Evaporation
  • Frequency
  • Gain
  • Losses
  • Radio Waves
  • Refraction
  • Refractive Index
  • Sampling
  • Security
  • Wave Propagation

Fields of Study

  • Physics

Readers

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