Atmospheric Absorption

Pathloss 6 gives the user the option to use either User Defined atmospheric data or have the program query the data tables from Recommendation ITU-R P.835-6 (Reference standard atmospheres)

The ITU-R P.835-6 data consists of monthly averages, conditioned to the hour of the day, of vertical profiles of temperature, pressure and water-vapour density using the ECMWF 15-year data set (ERA15). This data set contains the mean monthly vertical profiles at 00:00, 06:00, 12:00 and 18:00 UTC of total air pressure, air temperature and water-vapour density at 32 height levels from a reference height located around the local Earth’s surface up to about 30 km above the Earth’s surface. The data has a resolution of 1.5º in both latitude and longitude.

Pathloss uses the path center coordinates and antenna centerline elevation to bilinearly interpolate the values from the data sets.

The user can select either the Minimum, Maximum, or Averaged values.

Recommendation ITU-R P.835-6 Reference standard atmospheres (12/2017)