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    25 February 2017, Volume 37 Issue 1 Previous Issue    Next Issue
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    Adaptiveiterativelearningbasedfaulttolerantcontrolforasteroidorbiting
    HUANG Yi-Xin, LI Shuang, JIANG Xiu-Qiang
    2017, 37 (1):  1-10.  doi: 10.16708/j.cnki.1000-758X.2017.0002
    Abstract ( 574 )   PDF (5003KB) ( 506 )   Save
    Consideringtheprobeactuatorfailures,parametricuncertaintiesandexternaldisturbances,anadaptiveiterativelearningbasedfaulttolerantcontrolmethodwasdesignedforasteroidorbiting.Thecontrollerwasdividedintotwoparts:robustiterativelearningcomponentandneuralnetworkiterativelearningcomponent.Fortherobustiterativelearningcomponent,asliding-mode-likestrategywithadaptiveiterativelearninglawwasappliedtomaintainthestabilityandimprovetheattitudetrackingaccuracyincaseofactuatorfailures.Fortheneuralnetworkiterativelearningcomponent,aradialbasisfunction(RBF)neuralnetworkbasedadaptiveapproximationwasintroducedtoestimatethesystemuncertainty,withparametersadaptedonlinetomaintaindynamicperformance.Inaddition,numericalsimulationsshowthatthemethodachievedtheerrorintheorderof10-2magnitudeundertheactuatorfailureconditions,highlightstherobustandhighprecisionattitudetrackingperformance.
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    AconceptionofVLANspatialnetworkingundercooperativecontrol
    CHENG Yu, HU Wei-Duo
    2017, 37 (1):  11-18.  doi: 10.16708/j.cnki.1000-758X.2017.0003
    Abstract ( 640 )   PDF (3686KB) ( 509 )   Save
    Basedonlongtimedelay,highdynamicnature,andlimitedresourcesofthesatellitenetwork,aspacevirtuallocalareanetwork(VLAN)divisionmethodundercooperativecontrolwasproposedtoimplementspatialinformationnetwork.Firstly,toimprovetheutilizationrateofsatellitebandwidthandcomputingresources,satellitenetworkwasdividedintoseveralVLAN.Secondly,theroutingalgorithmwascombinedwithconsistencyalgorithmtoachievehigherreliabilityinsatellites′mutualconnectionandcommunication.Whenappliedtospatialsatellitenetwork,thealgorithmcanachievestrongconnectivitybetweeneachnode;whenappliedtoasinglesatellite,itcanhelpinintraarealoadbalanceandredundantbackup.Finally,examplesweregiventodemonstratetheeffectivenessoftheproposedalgorithmforbothspacenetworkandasinglesatellite.Theresultsshowthatallsatellitescanconvergencetotheirplannedorbitin50secondsandthenetworkcanachieveastablespacestructure.
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    Trajectoryplanningfornon-cooperativetargetmultispacecraftformationbasedonbehaviorstrategy
    WANG Tao, XU Yong-Sheng, ZHANG Ying-Chun, XIE Cheng-Qing
    2017, 37 (1):  19-25.  doi: 10.16708/j.cnki.1000-758X.2017.0006
    Abstract ( 442 )   PDF (5586KB) ( 1004 )   Save
    Thecurrentspacecraftformationtrajectoryplanningsdon′tconsidernoncooperativetarget,configurationcomplexityandcollaborativecontrolproblem.Arelativemotiontrajectoryplanningmethodbasedonbehaviorstrategywasproposedfornoncooperativetargetmultispacecraftformationsystem.Firstly,anunderlyingkinematicalfieldwasdesignedbasedonthegathermodel.Expectspeedwasdefinedasaseriesofspeedvectorwithdifferentbehaviorfeatures.Thebehavioradjustparameterswerecalculatedbyconstructingequilibriumshapingformula.Secondly,thenon-cooperativetargetwasdescribedwithGaussenvironmentfunction.TheexpectkinematicalfieldwasimprovedbyusingtheC-Wfunction.Themethod   notonlyavoidsthecollisionbetweentheformationmembers,butalsoguaranteesthesafedistancebetweenthenon-cooperativetargets.Thesimulationresultsshowthatthealgorithmcanmakethemulti-spacecraftformationsystemmovingtotheexpectconfigurationin3000seconds.Themethodhasobviousadvantageswhenusedincomplex,multiplecontroltargetoftheformationsystemtrajectoryplanning.Itisautonomy,collaborative,strongrobustness,andetc.Atthesametimethemethodcanbeappliedtodifferenttypesofformationconfigurationrelativemotionplanning.
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    Alocalizationalgorithmforadaptivemaneuveringspatialtargets
    LIN Hao-Shen, LIU Gang, HE Bing
    2017, 37 (1):  26-32.  doi: 10.16708/j.cnki.1000-758X.2017.0010
    Abstract ( 543 )   PDF (1862KB) ( 774 )   Save
    Inthespacetargettrackingproblem,themodelmismatchcausedbytargetmaneuveringleadstoserious    hysteresis.Inordertotrackspatialtargetfaster,thesuboptimalfadingparameterofstrongtrackingfilter(STF)wasintroducedinsquarerootcubatureKalmanfilter(SCKF),andtheequivalentformwasderived.Onthebasisofmaneuveringdetection,anadaptivestrongtrackingsquarerootcubatureKalmanfilter(AST-SCKF)whichcombinedtheaccuracyandrobustnesswasdesigned.Theresultsofsimulationshowthatthedifferenceinpositionalaccuracybetweentwoalgorithmsislessthan1%beforethemaneuvering,butafterthemaneuvering,itturnsoutthattheconvergenceaccuracyoftheAST-SCKFwas95.19%higherinpositionand30.50%fasterinvelocity.Meanwhile,theconvergencespeedofAST-SCKFwas57.20%and24.68%fasterthanSCKFintermsofpositionandvelocityrespectively.
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    Rigid-flexiblecouplingmodelingandcalibrationerroranalysisofthespacedoubleflexiblemanipulators
    GU Qing-Bo, LI Ang, ZHAO Hui-Guang
    2017, 37 (1):  33-40.  doi: 10.16708/j.cnki.1000-758X.2017.0011
    Abstract ( 454 )   PDF (5927KB) ( 475 )   Save
    Tostudytheimpactofthearmandjointflexibilityon theterminalcalibrationprecisionwhenthespacemulti-degreesoffreedommanipulatordidspatialmotioninalargerange,consideringthesecondarycouplingtermofaxialstretchingcausedbytheflexiblearmhorizontal/lateralbendingdeformation,aD-Hmethodwasproposedbasedonflexiblearmbyusingarotortorsion-springmodelincludinglumpedmasstodescribetheflexibleeffectofjoints.Theflexiblemechanismmovementequationofspacemanipulatorwasproposed.Thefirstapproximationrigid-flexiblecouplingdynamicsequationsofspacedoubleflexiblemanipulatorwasestablishedbyusingtheHamiltonprinciple.Thesimulationoftheterminalcalibrationerrorofthespacesixjointsdoubleflexiblemanipulatorwascarriedout.Theresultsshowthat:armandjointflexibilityarecoupledwhenthespacemanipulatorisinalargerangemovement.Toimprovethesuccessofthecaptureandoperation,thefetchingtargetsshouldbesetinthedirectionwithasmallercalibrationerrorofmanipulatorsinengineeringapplications.
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    PredictionofARAIMintegrityandavailabilitybasedonMHSSalgorithm
    LYU Zong-Ping , NI Yu-De, CHEN Jun, LIU Rui-Hua, ZHU Jin-Fang
    2017, 37 (1):  41-48.  doi: 10.16708/j.cnki.1000-758X.2017.0012
    Abstract ( 562 )   PDF (11835KB) ( 297 )   Save
    Asthetraditionalreceiverautonomousintegritymonitoring(RAIM)merelyprovidesnon-precisionapproachintegritymonitoring,astrictermonitoringservicewon′tbeavailablebyRAIM.However,advancedreceiverautonomousintegritymonitoring(ARAIM),whichsupportslocalizerperformancewithverticalguidance,canmeettherequirementsofintegritymonitoringwithinprecisionapproach.Basedonmultiplehypothesissolutionseparation(MHSS)algorithmanddifferentconstellationsituation,thesolutionprocessofhorizontalprotectionlevel(HPL)andverticalprotectionlevel(VPL)forARAIMwasexpounded.FiveobservationairportslocatedatdifferentlongitudesandlatitudesinthenorthandsouthhemisphereswereselectedtosimulatethechangesoftheHPLandVPLunderdifferentcombinationofconstellationsystemsaswellastheaveragedistributiontrendoftheHPLandVPLaroundtheworldandglobalcoverageratiooftheARAIMavailability,whichmettheavailabilityrequirementsoftheLPV-200approachwith99%probability.ThesimulationresultsshowthattheHPLandVPLofthatfiveobservationairportscanmeettheintegrityrequirementsoftheLPV-200approachforboththeGPS&GLONASSdual-constellationandtheGPS&GLONASS&BDStri-constellation,however,ARAIMcannotfullysupporttherequirementsofintegritymonitoringfortheLPV-200approachworldwideundertheconditionoftheGPS&GLONASSdualconstellation,whereastheavailabilityandnavigationserviceperformancesoftheARAIMcanbegreatlyimprovedwhenGPS&GLONASS&BDStri-constellationisused.
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    Automaticallygeneratingexplicitequationsofmotionformulti-bodysystems
    LI Jin-Yue, HU Quan, ZHANG Jing-Rui
    2017, 37 (1):  49-56.  doi: 10.16708/j.cnki.1000-758X.2017.0005
    Abstract ( 411 )   PDF (1575KB) ( 520 )   Save
    Thedevelopmentofthecomplexmultibodyspacecraftraiseshigherrequirementtomulti-bodydynamicsmodelingandcontroltechnology.Theexplicitdynamicsequationsofthesystemarealwaysneededtoanalyzesystem′scharacteristicsanddesigncontrollers,butthecomplexityofsystembringsdifficultytoderivingtheequations.Inordertosolvethisproblem,theexplicitformofdynamicsequations′analyticalexpressionwasinferredbyusingKane′smethod,thechainstructuresystem′sexplicitdynamicsequations; then,byanalyzingthisequation,physicalmeaningandregularitiesofdistributionofeachequationitemwere  established;usingthoseregularities,aprogramthatcanoutputtheexplicitdynamicsequationsofspacecraftsystemwithtreestructurewasdeveloped.Thisprogramreducestheworkloadofmodelingthistypeofspacecraftsignificantly.
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    Cislunarfreereturntrajectorydesign
    WANG Dan-Yang, DENG Hui
    2017, 37 (1):  57-65.  doi: 10.16708/j.cnki.1000-758X.2017.0013
    Abstract ( 587 )   PDF (4939KB) ( 614 )   Save
    Themostimportantthinginmannedlunarexplorationsissafety,whethertheprobecanfreereturnwhenfacingpowerfailureattheperiluneisanimportantcriterion.Withtheaimofdesigningcislunarfreereturntrajectory,tworequirementsshouldbesatisfied,thefirstistransfertrajectorydesignbetweentheearthandmoon,thesecondiswhethertheprobecanflybackafterlunarswing-by.Combinedwiththepreciseastronomicalephemeris(DE405),onetrajectoryindifferentmechanicalmodelswascomparedinordertodeterminewhatperturbationsshouldbeconsideredinthepreliminarytrajectorydesign.Then,almostallfactors(departuretime,transfertime,inclinationanglescombination,etc.)affectingthereturnperigeedistanceoftheprobewasanalyzed.Aunidirectionalsearchmethodwasproposed,whichcouldmaketheprobe′sreturnperigeedistancetendtothesettargetvaluegradually.Themethodissimpleandreliable,anditcansatisfyalltherequirementsofinitialtrajectorydesign.Theworkisofsomevaluetothecislunarfreereturntrajectorydesignofourmannedlunarexplorationsinthenearfuture.
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    Impactanalysisofloopslayoutonheatdissipationpotentialofmannedspacecraftradiator
    JIN Jian, WANG Yu-Ning
    2017, 37 (1):  66-74.  doi: 10.16708/j.cnki.1000-758X.2017.0009
    Abstract ( 418 )   PDF (11186KB) ( 307 )   Save
    Anunsteadynumericalmodelforheatdissipationpotentialofmannedspacecraftcylinderradiatorwithtwoparallelloopswasdeveloped.Basedonthismodel,impactofradiatorloopslayoutwithsameandreverseworkingliquidflowingdirectiononradiatorheatdissipationpotentialunderdifferentparameterswasanalyzed,includinglooplength,workingliquidfluxandworkingliquidtemperatureatloopentrance.Accordingtothecalculationresults,onthepremiseofthesameplateareaandlooplength,loopslayoutcouldbringnonignorabledifferenceofheatdissipationpotentialofradiators.Asthelooplengthislonger,workingliquidtemperatureatloopentranceishigher,orworkingliquidfluxisless,heatdissipationpotentialofradiatorwithsameworkingliquidflowingdirectionisbetterthanthatofradiatorwithreverseworkingliquiddirection.Thedifferenceofmaxheatdissipationpotentialcouldbeupto19.5%,andthedifferenceofminimumheatdissipationpotentialcouldbeupto16.7%.
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    DecodinganalysisoftimeinformationfromspacebasedAISmessage
    LI Shi-You, CHEN Li-Hu, CHEN Xiao-Qian
    2017, 37 (1):  75-81.  doi: 10.16708/j.cnki.1000-758X.2017.0014
    Abstract ( 754 )   PDF (4897KB) ( 899 )   Save
    Thetimeinformationevaluatedfromthemessageoftheautomaticidentifyingsystem(AIS)isofmostimportanceinmonitoringandcontrollingoftheglobalvessels.Aimingatcontinuouslymonitoringsomeparticularvessels,thetimeinformationintheAISmessagesoftheAISsystemsonboardboththeTianTuo-1(TT1)andTianTuo-3(TT3)micro-nano-satelliteswasstudied.Firstly,astatisticalanalysiswasperformedbyemployingtheAISdatareceivedbytheTianTuo-1nano-satelliteduringitsonorbitoperation.TheresultssuggestthatitisimpossibletoobtainthetimeinformationmerelybytheAISmessageitself.Secondly,thecompositionandformatoftheAISmessagereceivedbytheTT3-AISwasstudied.IntheTT3-AISsystem,atimeflagwasgeneratedeveryminutetobeinsertedintothereceivedAISdatapackage.ThustheTT3-AIShasagoodfunctiononaddingthetimeinformationtotheAISmessages,whichwillbehelpfulformonitoringandcontrollingoftheglobalvessels.
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    Short-timerainattenuationpredictionforKabandsatellitecommunicationsystembasedonnumericalweatherprediction
    WANG Hong-Feng, ZHANG Hui, LI Qiang, LU Chang-Sheng
    2017, 37 (1):  82-88.  doi: 10.16708/j.cnki.1000-758X.2017.0008
    Abstract ( 491 )   PDF (8760KB) ( 340 )   Save
    InordertoaccuratelypredicttheshorttermtrendandintensityofrainattenuationinKa-bandsatellitegroundlink,short-timerainattenuationpredictionforKa-bandsatellitecommunicationsystembasedonnumericalweatherpredictionwasintroduced,andthepredictionprocesswasdesigned.Thenonerainfallprocessinaregionwasstudiedbyusingthemethodmentioned
    above,andthemeasuredvaluesofrainfallattenuationandtheforecastvalueofrainfallattenuationbasedonnumericalforecastwerecomparedandanalyzed.Theexperimentalresultsshowthattheerrorofrainfallattenuationissmallbetweentheforecastvaluesandmeasuredvalues,andtheirvariationtrendisingoodagreement.Thismethodcanbeusedforshort-termrainfallpredictionofKa-bandsatellitecommunicationsystem.
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    Trackinganddatarelaysatellitesystemforhugenumbersatellitecontrol
    SHAN Chang-Sheng, LI Yu-Heng, SUN Hai-Zhong
    2017, 37 (1):  89-96.  doi: 10.16708/j.cnki.1000-758X.2017.0017
    Abstract ( 476 )   PDF (2541KB) ( 789 )   Save
    Usually,onorbitsatellitesarecontrolledbythegroundbasedTT&Cstations.Themoreon-orbitsatellitesareon-orbit,themoreTT&Cstationsandequipmentsareneededtobeconstructed.Meanwhile,duetotheEarthsurfacecurve,aTT&Cstationcancoveronlyafewpartofasatellite′sentireorbit.Highcoveragepercentageandmultipleaccesstechnologyenablethetrackinganddatarelaysatellitesystem(TDRSS)greatlyenhancingitspowerinspacedomainandfrequencytocontrolmuchmoreon-orbitlowearthorbitsatellites.Theanalysisonthelinkperformance,multipleserviceitems,multipleservicenumbersandcoveragepercentagemanifeststhataTDRSS,withitsSMAtechnology,cancontrolhugenumbersofon-orbitlowearthorbitsatellites.Threetrackinganddatarelaysatellites(TDRS)uniformlystationedatgeostationaryorbitcancontrolallChinacurrenton-orbitandtobelunchedsatelliteswithoutincreasingtheTT&Cstationsandequipments.ThenthreeSMAservicemodesweredescribed,whicheliminatetheTT&Ccontrolgapscausedbytheearthblackoutandquicklyresponsetoanyemergencyservice.WithTDRS′SMAsupport,asatellitecontrolcenterhasmorechoicetocontrolon-orbitsatelliteswhichimprovesitsmanagementefficiency,useefficiencyandmostimportantlytoimprovetheguaranteeofthesatellitesafety.
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    Anintegraltimecalculationmethodforagilesatellite
    ZHU Jian-Bing, ZHANG Meng, WANG Lu-Yuan, YUAN Jun, CHENG Bo-Wen, ZHAO Wei
    2017, 37 (1):  97-103.  doi: 10.16708/j.cnki.1000-758X.2017.0018
    Abstract ( 483 )   PDF (4191KB) ( 598 )   Save
    Traditionalintegraltimecalculationmodelscan′tsatisfytheaccuracyrequirement,becauseattitudeflexibilityandintegraltimechangeseverelyduringtheimagingofagilesatellite.Anintegraltimecalculationmodelwasproposedtoimprovetheaspectsofgroundvelocitycalculationofimagingpointandheightcalculationfromsatellitetogroundpoint.Digitalelevationmodelwasadoptedtocorrectheightvalueforheightcalculationfromsatellitetogroundpoint.Andtheattitudeangularvelocity′simpacttoangularvelocityvectorinthesatellitebodycoordinatesystemwasconsideredwhencalculatedthegroundvelocityatimagingpoints.ThewholealgorithmimplementationonOBDHsubsystemwasdesignedandsimulationcalculationundertheembeddedenvironmentwasconducted.Theanalysisresultsmanifeststhemethodcanmeettheaccuracyrequirementofagilesatellitecameraimagingqualitysincethedifferenceiswithin001‰bycomparisonwithSTKsimulationcalculationresults.
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    Researchontriplefrequencycarrier-phaseobservationlinearcombinationofBeiDousatellitenavigationsystem
    YAN Huai-Cheng, HAN Bao-Min, ZHANG Jia-Xin
    2017, 37 (1):  104-110.  doi: 10.16708/j.cnki.1000-758X.2017.0019
    Abstract ( 526 )   PDF (4381KB) ( 585 )   Save
    ThemathematicalmodelofBeiDoutriple-frequencycarrier-phaselinearcombinationwasgivenbasedonBeiDousatellitenavigationsystemtriple-frequencydata,andthewavelength,ionosphericerrorandtheobservationnoiseoflinearcombinationwereanalyzedsystemmatically.Intermsofambiguityintegerpropertiesandusedtheintegerlineartransformationmethodasabasis,theoptimizationofthecombinationcoefficientwasrealizedbyMatlab.Byapplyingdifferentcombinationcoefficientstothecycle-slipdetectionbasedoncode-phase,itshowsthatthecombinedcycleslipdetectionwiththesumofthecombinationcoefficientsbeingnot0,ismorethan05weeks,andthelargerthesumofthecombinationcoefficientsis,thegreaterthefluctuationis.ByapplyingdifferentcombinationcoefficientstotheambiguityresolutionbasedonGF-CIRfortriplefrequencyobservations,itshowsthattheresidualvalueofambiguityobtainedbythecombinationofnon-zerocoefficientsbutlongwavelengthsareabout06weeks.Thecorrectambiguityfixedsolutioncanbeobtainedbytheappropriateambiguitysearchmethod,andthiskindofcoefficientscanbeusedinshortbaselineambiguityresolution.
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    Dumpingeffectofmicrowavesignalinplasmaslabswithsub-wavelengthcharacteristicsaroundspacecraft
    WANG Zhi-Bin, KONG Fan-Rong, E Peng, LIANG Yin-Chuan, ZHAO Yuan
    2017, 37 (1):  111-116.  doi: 10.16708/j.cnki.1000-758X.2017.0020
    Abstract ( 402 )   PDF (3313KB) ( 431 )   Save
    Aphysicalmodelforthepropagationcharacteristicsofelectromagneticwavesinthesub-wavelengthplasmawasestablished.Thetransmissionofelectromagneticwavesinthethin-layersurfaceofthereentryspacecraftwasstudiedfortheelectromagneticwaveinthecommunicationfrequencyband.TheproposedmodelwasbasedontheMaxwell′sequations,andadifferentialthinlayermethodwasusedtosolvetheproblem.Thetransmissioncharacteristicsandpropagationlawsoftheelectromagneticwaveinsubwavelengthplasmawereobtainedunderdifferentplasmadensities.Theeffectsofthecutoffreflectionandthecollisionalabsorptionwererevealed.Thisstudyisofgreatsignificanceforunderstandingthepropagationcharacteristicsofelectromagneticwavesinsub-wavelengthcollisionalplasmas.
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    DesignandimplementationofinterferencesuppressionalgorithmforBeiDouandGPSdual-frequencyreceiver
    ZHANG Jian-Li, YANG Zu-Fang, PAN Wei, ZHENG Jian-Sheng
    2017, 37 (1):  117-123.  doi: 10.16708/j.cnki.1000-758X.2017.0007
    Abstract ( 457 )   PDF (8248KB) ( 361 )   Save
    BeiDouandGPSreceiversaresusceptibletointerference.Inordertoimprovetheperformanceofthereceiverunderstrongjammingenvironment,theeffectsofdifferentarraysanddifferentalgorithmsontheanti-jammingperformanceofthereceiverwerestudied.AnantijammingplatformforBeiDouandGPSdual-modereceivingsystemwasdesignedandimplemented
    onthebasisofGPSantiinterferenceresearch.Theexperimentalresultsshowthatbythissystem,theBeiDouandGPSdualmodereceiverscansearchupto6BeiDounavigationsatellitesand5GPSnavigationsatellites,andlocateundertheenvironmentof-30dBmstronginterference.Thesystemcanalsobeextendedtoavarietyofsatellitenavigationreceiversanti-jammingplatform.
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