ITU R S 736:1997
ITU R S 736:1997 Estimation Of Polarization Discrimination In Calculations Of Interference Between Geostationary Satellite Networks In The Fixed Satellite Service
Table of Contents
ANNEX1-Estimationofpolarizationdiscrimination1Definitionofthepolarizationofawave
2Definitionofpolarizationangleandofrelativealignment
angle
3Definitionofpolarizationdecouplingratioand
polarizationdiscrimination
4Calculationofpolarizationdiscrimination,Y,inlinear
polarization
4.1Calculationofpolarizationdiscrimination,Yd,inthe
down-link
4.2Calculationofthepolarizationdiscrimination,Yu,in
theup-link
5Calculationofpolarizationdiscrimination,Y,inthecaseof
twopolarizations:onecircular,theotherlinear
6Applicationtoactualcases
7Orientationofpolarizationplanes
8Depolarizationduetorain
APPENDIX1TOANNEX1-Optimizationofpolarizationorientation
1Simplemodelofasatellite-to-Earthlink
2Polarizationorientationtominimizeinterferencedueto
raindepolarization
3Polarizationorientationtominimizeclear-skyinterference
APPENDIX2TOANNEX1-Calculationofpolarizationangle
andrelativealignmentangle
1Calculationofpolarizationangleeofawaveinlinear
polarization
1.1Definitionoforthonormalcoordinatesystems
1.2Particularcase:theearthstationisatthe
boresight:P=Pv
1.3Generalcase:theearthstationisdistinctfrom...
2Calculationofrelativealignmentanglebforthelinear
polarization
2.1Down-linkcase:receptionbyawantedearthstationP1
2.2Uplinkcase:receptionbyawantedsatelliteS1
APPENDIX3TOANNEX1-Depolarizationduetorain:
Cross-polarizationofwavesinthe
troposphereforEarth-space...
1Definitionofcross-polarizationdiscriminationduetorain
2Executivesummaryofamethodforcalculatinglong-term
statisticsofhydrometeor-inducedcross-polarization
3Executivesummaryofamethodforcalculatinglong-term
rainattenuationstatisticsfrompointrainfallrate
4Degradationsofpolarization
5Effectsofrainontheattenuationofwaves
5.1Estimationsofattenuations