Policy on Intellectual
Property Right (IPR)
RECOMMENDATION ITU-R P.618-10
Propagation data and prediction methods required for the design of
Earth-space telecommunication systems
Scope
Annex 1
1 Introduction
2 Propagation loss
2.1
Attenuation due to atmospheric gases
2.2
Attenuation by precipitation and clouds
2.2.1 Prediction of
attenuation statistics for an average year
2.2.2 Seasonal variations – worst month
2.2.3 Variability in space and time of statistics
2.2.4 Site diversity
2.2.5 Characteristics of precipitation events
2.3
Clear-air effects
2.3.1 Decrease in antenna gain due to wave-front
incoherence
2.3.2 Beam spreading loss
2.4
Scintillation and multipath fading
2.4.1 Calculation of monthly and long-term
statistics of amplitude scintillations at elevation angles greater than 4°
2.4.2 Calculation of the deep fading part of the
scintillation/multipath fading distribution of elevation angles less than 5°
2.4.3 Calculation of the
shallow fading part of the scintillation/multipath fading distribution at
elevation angles less than 5°
2.5
Estimation of total attenuation due to multiple sources of
simultaneously occurring atmospheric attenuation
2.6
Attenuation by sand and dust storms
3 Noise
temperature
4 Cross-polarization
effects
4.1
Calculation of long-term statistics of hydrometeor-induced
cross-polarization
4.2
Joint statistics of XPD and attenuation
4.3
Long-term frequency and polarization scaling of statistics of
hydrometeor-induced cross‑polarization
4.4
Data relevant to cross-polarization cancellation
5 Propagation
delays
6 Bandwidth
limitations
7 Angle of arrival
8 Calculation of
long-term statistics for non-GSO paths