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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 ( 866 )   PDF (5003KB) ( 732 )   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. Related Articles | Metrics

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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 ( 958 )   PDF (3686KB) ( 750 )   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. Related Articles | Metrics

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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 ( 673 )   PDF (5586KB) ( 1166 )   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. Related Articles | Metrics

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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 ( 793 )   PDF (1862KB) ( 1223 )   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. Related Articles | Metrics

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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 ( 649 )   PDF (5927KB) ( 631 )   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. Related Articles | Metrics

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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 ( 920 )   PDF (11835KB) ( 359 )   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. Related Articles | Metrics

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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 ( 634 )   PDF (1575KB) ( 662 )   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. Related Articles | Metrics

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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 ( 1018 )   PDF (4939KB) ( 920 )   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. Related Articles | Metrics

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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 ( 651 )   PDF (11186KB) ( 351 )   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%. Related Articles | Metrics

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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 ( 1203 )   PDF (4897KB) ( 1371 )   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. Related Articles | Metrics

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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 ( 876 )   PDF (8760KB) ( 398 )   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. Related Articles | Metrics

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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 ( 695 )   PDF (2541KB) ( 1131 )   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. Related Articles | Metrics

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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 ( 664 )   PDF (4191KB) ( 760 )   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. Related Articles | Metrics

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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 ( 740 )   PDF (4381KB) ( 751 )   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. Related Articles | Metrics

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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 ( 682 )   PDF (3313KB) ( 599 )   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. Related Articles | Metrics

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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 ( 775 )   PDF (8248KB) ( 421 )   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. Related Articles | Metrics