scope:

This Recommendation provides methods to estimate the attenuation of atmospheric gases on terrestrial and slant paths using:

a) a method in Annex 1 to estimate the gaseous attenuation computed by a summation of individual absorption lines that is valid for the frequency range 1-1 000 GHz;

b) two simplified approximate methods in Annex 2 to estimate the gaseous attenuation that are valid in the frequency range 1-350 GHz; and

c) other propagation effects that can be computed by a summation of functions of individual absorption lines.