挠性卫星姿态快速机动算法分析

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1、哈尔滨工业大学工学硕士学位论文AbstractThecapabilityofrapidatttitudemaneuverisakeytechnologyoftoday'ssatellite,itrequiresthatthesatelliteonorbitcancompleteintheshortesttimetoadjusttheprocessofconvertingfromoneattitudetoanotherattitude.Comparedwiththeearlyspaceexploration,contempo

2、rarysatellitestructuresbecomemorecomplex.Inadditiontotherigidmainpart,thesatellitesalsohavetheflexibleattachmentofavarietyofpurposes.Fortherapidattitudemaneuverofflexiblesatellite,themaincontentsofthethesisareasfollows.Forthethree-axismaneuverrelativetotheinertial

3、frame,amethodbasedontheinputandoutput(I/O)feedbacklinearizationandcompositenonlinearfeedback(CNF)methodisproposedtocompletethelargeangleattitudemaneuvernearthespecifiedtimepointwithoutovershoot,namelyIO-CNFmethod.Firstlyquaternionandthemodalcoordinatesareasthestat

4、esofattitudeequationofthesystem.Anewsetofcoordinatesystembasedonhomeomorphismisgiven;Acontrolalgorithmcombinedwiththeclassicaltime-domainanalysisandCNFmethodisdesignedforfaststepresponsewithoutovershoot,andthedesignprinciplesoftherequiredparametersisgiven.Finally,

5、torqueisgivenbasedonthecontrolalgorithm,andproofisgivenforthethestabilityofthezerodynamicsnamelytheminimumphasetoensuretherigorandintegrityofthecontrollaw.Twokindsofmodeobserver(IandII)aredesignedfortheproblemsofmodalcoordinatesinpreviousresearchbeingdifficulttome

6、asure.Anewequationofstateisgivenusingtheangularvelocitythemodalcoordinateanditsderivativeasstates,torqueasaninputandangularvelocityastheoutpuforthedesignofmodalobserverI.Acompletesetofdesignprinciplesandstepsaregivenforflexiblesatellitemodalobserverparameterscombi

7、nedwiththesatellitemodelaccordingtoastateobserverdesignmethodbasedoninvariantsetsstability.ForthedesignofmodalobserverII,basedontheequationofstateontheoftheobserverI,anonlinearfunctionisgivenasthecombinedoffunctionsofmodalparametersandvariablesinthedifferentialequ

8、ationaboutangularvelocity.ObserverII,namelytheESOformofflexiblesatelliteattitudedynamicequationsisgivenbasedonextendedstateobserver(ESO)method.Forthepre