System Description

–AircraftEarthStations(AESs).
–SpacesegmentformedbythreeInmarsat-4andanInmarsat-4Ageostationarysatellites
thatprovidesglobalcoverage,exceptforthepolarregions.Thiswillbesupplementedby
Inmarsat-6satellites,whicharescheduledforlaunchin2020.
–AterrestrialgroundinfrastructureformedbytheSatelliteAccessStations(SASs).
–Terrestrialinterconnectnetworks.
–NetworkControlCentreandaBusinessSupportSystem.
(4)TheuserlinksareinL-band1518-1559MHzforsatellitetoAES,1626.5-1660.5MHzand
1668-1675MHzforAEStosatellite.
C. Expected Data Rate
(1)ThedataratethroughtheSmallSatcomterminalisdependentuponmanyfactorssuchassize
ofgroundplane,networkcongestion,satelliteselection,multipathfading,satelliteelevation,
UAVbankingetc.Ingeneral,thesatellitewiththehighestelevationwillworkbestandsevere
bankingawayfromthesatelliteshouldbeavoided.
(2)Forwardreferstodatabeingpassedfromthegroundandreturnreferstodatabeingpassed
fromtheUAVasseeninFigure2.
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SYSTEM DESCRIPTION, INSTALLATION, AND MAINTENANCE MANUAL
SMALL SATCOM