Propagation aspects

Propagation aspects

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At low elevation angles, the propagation of radio waves is degraded by both atmospheric effects and scattering by the terrain. For many general-purpose surveillance requirements, the four-thirds earth approximation is a sufficiently good correction for atmospheric refraction (the strongest effect) and the other problems are ignored. When precision target tracking is required, all atmospheric effects have to be considered, and appropriate corrections made, based on local climatic information. The electron content of the ionosphere also causes attenuation and refraction effects, and a rotation of the plane of polarization. Radio waves passing through the ionosphere may suffer a form of scintillation that can affect space-borne earth-imaging radars.

Chapter Contents:

  • 8.1 Introduction
  • 8.2 The radar horizon
  • 8.3 Atmospheric effects
  • 8.4 Diffraction by the terrain
  • 8.5 Battlefield radar systems
  • 8.6 Ionospheric effects
  • 8.7 Summary
  • 8.8 References
  • 8.9 Problems

Inspec keywords: radiowave propagation; target tracking; precision engineering

Other keywords: atmospheric effect; ionosphere electron content; radio wave propagation; attenuation; space borne earth imaging radar; precision target tracking; elevation angle; surveillance requirement; climatic information; earth approximation; refraction effect; scintillation; scattering

Subjects: Signal processing and detection; Radar equipment, systems and applications; Radiowave propagation

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