Atmospheric Gaseous Attenuation

Practical example:

Investigating whether a space station (satellite) can share the same frequency as a terrestrial (microwave) station; (allocations from 10 to 48 GHz).

By how much will the attenuation on the slant path due to gaseous absorption protect the terrestrial station?

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Notes:

Several bands between about 10 and 48 GHz shared by FS (e.g. microwave links) and FSS (using satellites in GSO or LEO).

In establishing sharing criteria, e.g. max powers radiated, one needs to know how much attenuation is occurring on the interference slant path between satellite and terrestrial station due to gaseous absorption.

In other words, how much protection is the atmosphere providing the terrestrial station?

This is example of how model in Rec. P.676 can be used in a sharing situation in providing an estimate of the gaseous attenuation on the interfering path.