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1、AIAAGuidance,Navigation,andControlConferenceandExhibitAIAA2004-477516-19August2004,Providence,RhodeIslandModelReferenceAdaptiveGuidanceforRe-entryTrajectoryTrackingE.MooijDutchSpaceB.V.,Leiden,TheNetherlandsAbstractgeocentriclongitude[rad]heading[rad
2、ThedesignofaModelReferenceAdaptiveGuidancesystemthatisappliedtothetrackingofthetrajectory1.Introductionofawingedre-entryvehicleisdiscussed.ThisdesignmakesuseofSimpleAdaptiveControltheory,whichForthenextgenerationofreusablelaunchvehiclesaimsattracking
3、theoutputofareferencemodel.The(RLVs),oneoftheaspectsthatreceivesalotofreferencemodelisalinearisedstate-spaceattentionisthedesignofrobustguidanceandcontrolrepresentationofthenon-linearre-entryvehicle,systems.Theseadvancedguidanceandcontrolstabilisedby
4、anoutputfeedbackcontroller.technologiesarecriticalformeetingsafety/reliabilityandcostrequirements(Hanson,2002).WithinThedesignisdoneforthreetrajectorypoints,rangingndNASA's2GenerationRLVProgramme,manyofthefromlow(highMachnumber)tohigh(lowMachrecentef
5、fortsinrobustascentandentryguidancenumber)dynamicpressureoperatingconditions,systemdesignhavebeentestedandcomparedwithwheretheplantislinearisedaswell.Stepcommandsrespecttoperformanceandrobustness(Hansonandinvelocity,flight-pathangleandaltitudeareanal
6、ysed,Jones,2002).aswellastheresponsetolargeerrorsininitialconditions.ThetrackingcapabilitiesoftheguidanceSincethedevelopmentoftheSpaceShuttleguidancesystemaregood,evenforthecurrentconfigurationofsystem,whichconsistsofrangeandcross-rangenon-optimisedd
7、esignparameters.predictionlawsfor,amongstothers,constantdragandequilibriumglide(HarpoldandGraves,1979),Toverifytheguidance-systemperformanceinanon-manynew(albeittheoretical)developmentshavelinearenvironment,itisimplementedinanelaboratebeenpublished.T
8、heseconceptsaimedeitheratflightsimulationtool.AlsointhiscasethetrackingimprovementsoftheexistingShuttlelaws,e.g.,thebehaviouroftheguidancesystemisgood,althoughuseofdragpolynomialsratherthanconstantdragtheperformancecanbeimprovedoncethedesign(Roenneke
