atten_specific_annex1#

pycraf.atm.atten_specific_annex1(freq_grid, press_dry, press_w, temp)[source]#

Specific (one layer) atmospheric attenuation according to ITU-R P.676-11, Annex 1.

Parameters:

freq_gridQuantity: Frequencies at which to calculate line-width shapes [GHz]
press_dryQuantity: Dry air (=Oxygen) pressure [hPa]
press_wQuantity: Water vapor partial pressure [hPa]
tempQuantity: Temperature [K]

Returns:

atten_dryQuantity: Dry-air specific attenuation [dB / km]
atten_wetQuantity: Wet-air specific attenuation [dB / km]

Notes

No integration is done between freq_grid positions, so if you’re interested in high accuracy near resonance lines, make your freq_grid sufficiently fine.