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1、24thAIAAInternationalCommunicationsSatelliteSystemsConference(ICSSC)anAIAA2006-530611-14June2006,SanDiego,CaliforniaAIAAInternationalCommunicationsSatelliteSystemConferenceAIAA-2006-5307ConferenceandExhibitSanDiego,CA12-14June2006RecentAdvancesinSatellitePropulsionandAssoci
2、atedMissionBenefitsFredC.WilsonAerojet–RedmondOperations,Redmond,Washington,98074Aerojethasrecentlycompletedseveralimportantnewadvancesinsatellitepropulsionthatofferthepotentialtoprovidedramaticmissionbenefitstothesatelliteusercommunity.Theseadvanceshaveoccurredintheareasof
3、liquidmonopropellantpropulsionsystems,liquidbipropellantpropulsionsystems,andelectricpropulsionsystems.Intheareaofliquidmonopropellantsystems,Aerojethasrecentlydevelopedanewmonopropellantsystemthatprovidesapproximatelya60%density-specificimpulseimprovementoverhydrazine,enab
4、lingupto50%smallerandupto20%lighterspacecraftpropulsionsystemdesigns.Intheareaofliquidbipropellantpropulsionsystems,Aerojethasrecentlycompletedqualificationofahydrazine/NTOenginewithaniridium-rheniumchamberthatprovidesspecificimpulseperformanceof>328secondswhichcanprovidepr
5、opellantmasssavingsupto135kgonalargeGEOcommunicationssatelliteapogeemaneuver.Intheareaofelectricpropulsion,AerojethasmadeimportantnewadvancesinHallsystems,PulsedPlasmasystems,andIonsystemsthatofferevenmoredramaticsavings.InHallsystems,Aerojetrecentlysuccessfullycompletedqua
6、lificationofour4.5kWHallThrusterPropulsionSystem(HTPS).TheHTPScanprovidepropellantmasssavingsupto900kgforlargeGEOcommunicationssatellitemissions.AerojetisalsodevelopingaHigh-PowerhallPropulsionSystem(HPPS)underAirForcefundingthatcouldenableall-EPspacecraftdesignsinthefuture
7、,enablingsatellitemasssavingsupto1,600kg.Aerojethasalsorecentlysuccessfullycompletedin-flightvalidationofourPulsePlasmaThrusters(PPTs)forspacecraftACScontrol.PPTscanprovideveryfineimpulsebitcontroloveraverylonglife,allinaverysimplemodularpackage,andofferthepotentialtoreplac
8、ethemomentum/reactionwheelscurrentlyusedonspacecraftwithalighter,lower-costsolutio
