Absorption byAtmospheric Gases

Recommendation P.676

“Attenuation by Atmospheric Gases”

• Full “line-by-line” calculation

  • summation of individual resonance lines

• Approximate formulations

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• Rec. P.676 – Recommendation dealing with subject which provides the model used in all ITU-R prediction procedures that require an assessment of attenuation due to atmospheric gases.

• Rec gives:
  • an accurate calculation by means of a summation of the individual resonance lines from oxygen and water vapour
  • formulae for an approximate estimation; these are often used in coordination procedures where a fast simple solution is required, but with sufficient accuracy.