Global Clutter Model for HF Radars.

Abstract

Over-the-Horizon radars (OTHR) operating in the high frequency (HF) band are challenged by spread-Doppler clutter and blanketing sporadic E. Magnetic field-aligned irregularities imbedded in nighttime E layers are identified as a new source component of spread-Doppler clutter. In particular, observations of very high frequency (VHF) spread-Doppler signatures are explained in terms of a polarization electric field model which is applicable to HF as well. In addition, the seasonal morphology of sporadic E occurrence is explained in terms of the ionospheric electric field, which acts as the controlling factor over the metallic ion supply. Knowledge of this electric field will allow prediction of sporadic E occurrences.

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Document Details

Document Type
Technical Report
Publication Date
Oct 01, 1997
Accession Number
ADA342628

Entities

People

  • Roland T. Tsunoda

Organizations

  • SRI International

Tags

Communities of Interest

  • Air Platforms
  • Materials and Manufacturing Processes
  • Sensors
  • Weapons Technologies

DTIC Thesaurus Topics

  • Boltzmann Equation
  • Charged Particles
  • Databases
  • Electric Fields
  • Electromagnetic Fields
  • Electrons
  • Elevation
  • Frequency
  • Frequency Bands
  • Geometry
  • High Altitude
  • Ionosphere
  • Magnetic Fields
  • Measurement
  • Radar
  • Solar Activity
  • Temperate Regions

Readers

  • Radar Systems Engineering.
  • Space/Atmospheric Physics.