Ionospheric propagation

M. J. Angling, P. S. Cannon, P. Bradley

Research output: Chapter in Book/Report/Conference proceedingChapter


For ionospheric signals the SNR is determined by a number of factors. For HF signals, a critical consideration is whether the signal is actually reflected from the ionosphere. All trans-ionospheric signals also experience some excess attenuation over free space, but because this is frequency dependent, the effects at higher frequencies are generally negligible. Multipath arises from various sources. A transmitted HF signal can be reflected from more than one of the several layers in the ionosphere. The transmission of a single pulse of energy is consequently received as a number of pulses which may be distinct or which may overlap. This situation is further complicated because the signals can also bounce off the ionosphere more than once, having been reflected from the ground in between. The earth’s magnetic field also splits signals into two orthogonal polarisations which travel at a different speed and follow a slightly different path.

Original languageEnglish
Title of host publicationPropagation of Radiowaves, 3rd Edition
EditorsLes Barclay
PublisherInstitution of Engineering and Technology (IET)
Number of pages35
ISBN (Electronic)9781849195799
ISBN (Print)9781849195782
Publication statusPublished - Jan 2012

Publication series

NameIET Electromagnetic Waves Series
PublisherInstitution of Engineering and Technology (IET)


  • Earth magnetic field
  • Electromagnetic wave polarisation
  • Electromagnetic wave reflection
  • Hf band interference
  • Hf radio propagation
  • Hf signal reflection
  • Ionospheric electromagnetic wave propagation
  • Ionospheric signal propagation
  • Magnetic fields
  • Multipath propagation
  • Orthogonal polarisation
  • Signal attenuation
  • Signal classification
  • Trans-ionospheric signal

ASJC Scopus subject areas

  • Engineering(all)


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