SG 3- some key areas of study -

• Global mapping of radiometeorological parameters

  • rain intensity, water vapour density
  • refractivity

• Prediction procedures

  • interference and coordination
  • Earth-satellite paths
  • short-range communications (personal, LANs)

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• Most prediction methods require fundamental information on the propagation medium as input data, e.g. radiomet data such as rainfall intensity. SG develops global maps of such parameters, mainly based on measurements, but sometimes involving some mathematical mapping techniques. Examples of such global maps include rain intensity, cloud water vapour content, refractivity gradient.

• Development of propagation prediction procedures suitable for the various radiocom services. Examples include i) need to quantify signals likely to cause interference between two services, e.g. where earth stations share frequencies with terrestrial stations - need to quantify the modes due to all possible propagation mechanisms between two points on the Earth’s surface; ii) slant path prediction for fixed-sat systems as well as mobile sat and b’sat systems; example propagation effects in latter include building blockage, building (and vehicle) entry loss, vegetation effects; iii) involves paths both inside and outside buildings; studies include modelling propagation associated with personal mobile communications and with RLANs – the latter being installed inside offices or between office buildings; reflection and scattering characteristics of building construction material is one of many important considerations.