Note: This page has been translated by MathWorks. Please click here

To view all translated materals including this page, select Japan from the country navigator on the bottom of this page.

To view all translated materals including this page, select Japan from the country navigator on the bottom of this page.

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.

Was this topic helpful?