Attenuation byAtmospheric Gases

Take into account for frequencies > 10 GHz when estimating total propagation loss on:

• Terrestrial LOS paths

  • Recommendation P.530

• Earth-space paths

  • Recommendation P.618

• Both use the model of Rec. P.676

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• Below about 10 GHz, atmospheric gaseous attenuation can generally be ignored.

• Examples of two ITU-R Recommendations containing methods for predicting the total propagation loss on:
  • LOS terrestrial paths
  • Earth-space paths

where it would be necessary to include an assessment for gaseous absorption.

• Both of these Recs point to Rec. P.676 for the model to be used.