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RF signal attenuation due to atmospheric gases

`L = gaspl(range,freq,T,P,den)`

returns
the attenuation, `L`

= gaspl(`range`

,`freq`

,`T`

,`P`

,`den`

)`L`

, when signals propagate through
the atmosphere. `range`

represents the signal path
length, and `freq`

represents the signal carrier
frequency. `T`

represents the ambient temperature, `P`

represents
the atmospheric pressure, and `den`

represents
the atmospheric water vapor density.

The `gaspl`

function applies the International
Telecommunication Union (ITU) atmospheric gas attenuation model [1] to calculate path loss for signals
primarily due to oxygen and water vapor. The model computes attenuation
as a function of ambient temperature, pressure, water vapor density,
and signal frequency. The function requires that the signal path is
contained entirely in a uniform environment. Atmospheric parameters
do not vary along the signal path. The attenuation model applies only
for frequencies at 1–1000 GHz.

[1] Radiocommunication Sector of International
Telecommunication Union. *Recommendation ITU-R P.676-10:
Attenuation by atmospheric gases* 2013.