soho mission halo orbit recovery from the attitude soho任务的晕轨道恢复从态度课件

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1、TheSOHOMissionHaloOrbitRecoveryfromtheAttitudeControlAnomaliesof1998CraigE.RobertsComputerSciencesCorporationFlightDynamicsFacilityGoddardSpaceFlightCenterLibrationPointOrbitsandApplications10-14June2002Paradord’AiguablavaGirona,SpainContentsIntroductiontoSOHOanditsHaloOrbitSOHOStationke

2、epingTechniqueJune1998AnomalyandRecoveryDecember1998AnomalyandRecoveryConclusionSolarHeliosphericObservatory(SOHO)SpacecraftSOHOMissionOverviewLaunched3December1995;Sun-Earth/MoonL1HaloOrbitInsertion(HOI)March1996JointESA/NASAmission;secondNASAmissiondedicatedtoSun-EarthL1haloorbitPurpose:S

3、unandsolarwindscience3-axisstabilized;closedloopattitudesystemwithmomentumwheels,gyros(formerly),Sunsensors,FHSTsSteeringlawskeepS/CX-axisandinstrumentboresightsSun-pointing;Z-axisnodstostayalignedwithSun’sspinaxisovercourseofyearHydrazineblowdownpropulsionfortranslationalcontrol,momentumma

4、nagementandbackupattitudecontrolTwofullyredundantstringsof84.5NthrustersperstringSOHO’sHalo:ViewfromNEPSOHO’sClass2Halo:SideViewSOHO’sHalo:LookingSunwardfromEarthSOHOHaloOrbitStationkeepingTechniqueSingle-axiscontrolThrustvectorsalignedwithS/CbodyX-axis(X-axisalwaysSun-pointed)Thrust/Vthen

5、paralleloranti-paralleltoS/C-SunlineUpshot:VbasicallyalongEarth-Sunline(GSEX-axis)TrajectorypropagatedtoacandidateSKepoch;Vappliedanddifferentiallycorrectedastrajectorypropagatedtowardatargetgoal(RLPVX=0)insubsequentRLPXZ-planecrossing;repeateduntiltwohalorevolutionsareachievedVtowardthe

6、Sunincreasesorbitalenergy,preventinghalodecaybacktowardEarthVawayfromSundecreasesorbitalenergy,preventingescapeintofreeheliocentricorbitStationkeepingRealitiesLPOcorrectioncostsincreaseexponentiallyfromepochoflastimpulse;doublingconstant16daysBurnperformancedeviations(errors)dominateorbit

7、knowledgeerrors;so,arebiggestcontributiontothemagnitudeofthenextSKburnForSOHO,weprefertoburnwellbeforecorrectioncosthasgrownto1.0m/secSOHOSKtechniquenominalperformance:3to4burnsperyear;90to120daysapart;2to3m/sec/yearHowever,SOHOattitudecontrolrealitiesin