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25 August 2014, Volume 34 Issue 4 Previous Issue    Next Issue

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LowthrustMissionWindowSearchBasedonMultiimpulseEnergyEstimation JIANG Xiao-Yong, ZHANG Hong-Bo, TANG Guo-Jian 2014, 34 (4):  1-7.  doi: 10.3780/j.issn.1000.758X.2014.04.001 Abstract ( 1300 )   PDF (812KB) ( 1310 )   Save Amissionwindowsearchapproachwasproposedforthelowthrustmissionbasedonthemultiimpulseenergyestimation.Themultiimpulsetransfer,whichcanbeextendedrapidlyfromtheLambert′sbiimpulsesolutionwithinseveraliterations，wasemployedtoeffectivelysubstituteforalowthrusttrajectorydesign.Throughgridsearchofmultiimpulsetransfers,thefeasibleregionsofthemissionwindowwereobtained.Numericalresultsshowthat:1)theapproachissuitableforbothrendezvousandflybymissions;2)itsconsistencywithlowthrusttransferinenergyconsumptionisbetterthanthebiimpulsestrategy;3)itscomputationaltimeis1~2ordersofmagnitudelowerthanthatofSimsandFlanagan′sapproach.ItsapplicationtoanEarthMarsrendezvousmissionverifieditsvalidity.Thefeasibleregionsweregeneratedwithin8.59s,whichcanbereadilyusedtogenerateoptimallowthrusttrajectories. Related Articles | Metrics

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TrajectoryPlanningAlgorithmforManipulatorsCapturingNoncooperativeObjects XU Shuan-Feng, YANG Bao-Hua, ZHANG Du-Zhou, ZHU Zhi-Bin, TANG Qiang, ZHANG Hai-Bo 2014, 34 (4):  8.  doi: 10.3780/j.issn.1000.758X.2014.04.002 Abstract ( 1315 )   PDF (785KB) ( 1135 )   Save Amanipulatortrajectoryplanningalgorithmbasedonafeedbackcoefficientforposition/orientationerrorwasproposed.Areactionnullspace(RNS)methodwasemployedtoachievethecoordinationmotionbetweenthebasespacecraftandthemanipulatorwhichwasutilizedtoexecuteonorbitservicing(OOS).Inordertogivedesiredmanipulatormotionatanaveragejointvelocity,afeedbackcoefficientforposition/orientationerrorwasintroduced,allowingtoassignweightingfactorstothemanipulatormotion.Inordertotestandverifythetrajectoryplanningalgorithmforspacemanipulator,thehardwareintheloop(HIL)groundexperimentsimulatorwasestablished,whereafixedbasedrobotmanipulatorwasadopted.Simulationresultsdemonstratethattheproposedtrajectoryplanningalgorithmcanguaranteethatthemanipulatorendeffectorapproachthenoncooperativeobjectatawellproportionalspeed,andgrasptheobjectwithsatisfyingprecision.Itoffersaguidelinefortrajectoryplanningofspacemanipulatorwhencapturingthenoncooperativeobjects. Related Articles | Metrics

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AnalysisModelingandVerificationofSolarRadiationPressureforNavigationSatellite CHEN Qiu-Li, WANG Hai-Hong, CHEN Zhong-Gui 2014, 34 (4):  16.  doi: 10.3780/j.issn.1000.758X.2014.04.003 Abstract ( 1625 )   PDF (748KB) ( 1327 )   Save Ananalyticalsolarradiationpressure(SRP)modelingmethodfornavigationsatelliteswasproposedtoimprovetheprecisionofpreciseorbitdetermination.ComparedwiththeotherperturbingforcemodelswhichhavemuchlargermagnitudebecauseofSunactivityleadingtochangesoftheSunenergy,satellitesattitudecontrolerror,aswellastheagingofthesatellitesurfacematerial,andasthemajoruncertaintyerrorsourcesaffectingmediumearthorbitsatellites,SRPmodelisthemostdifficulttobeconstructedprecisely.Onthebasisofattitudecontrollawofnavigationsatellite,ananalyticalSRPmodelwasdeveloped,inwhichtheperturbingaccelerationwasexpressedinsatellite′sbodyfixedcoordinatesystem.SimulationresultsofGPSBlockIIRshowthattheSRPmodelworksquitewell.ThecomputationalcostisquiteclosetothatoftheT30andECOMSRPmodel,provingthattheprecisionofSRPmodelmeetstherequirementofprimarySRPstudy. Related Articles | Metrics

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SelectiononImprovedFuzzyCMeansAlgorithmofBeidouTripleFrequencyCombinationObservations HE Wei, TAO Ting-Ye, WANG Zhi-Ping 2014, 34 (4):  24.  doi: 10.3780/j.issn.1000.758X.2014.04.004 Abstract ( 1922 )   PDF (620KB) ( 1230 )   Save ThecombinedobservationsanderrorsofBeidousatellitenavigationsystembasedontribanddoubledifferencewerediscussed.AnincrementaldistancecorrectionbasedfuzzyCMeansalgorithmwasproposedtoovercomethedisadvantageoftheclusteringmethod，whichpreviouslyusedtostudythecombinationobservationsofGPStribanddata.Thecorrectclassificationcanbegotbyadjustingthefactorandclustercenterofthesampledistancefromthecentereffectivelytoobtainareasonabledegreeofmembershipandavoiddeterminingthenumberofclustersofhumanirrationality.Thedistancebasedclusteringvalidityindexcorrectionwascreated,andtheoptimalnumberofclusterscanbeautomaticallyobtainedbyintroducinganincrementalwhenthedatawasincreasedbasedontheoriginaldataset.Thenewdatawereclassifiedbasedontheoriginaldatasetwithoutrecalculation.Thefeasibilityandreliabilitywereprovedbythematrixtransformationmethodandtypicalexamples. Related Articles | Metrics

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NumericalAnalysisontheDeploymentandFoldingProcessofLargescaleSolarSailMembrane HUANG Xiao-Qi, WANG Li, LIU Yu-Fei, YANG Chen, CHEN Ying 2014, 34 (4):  31.  doi: 10.3780/j.issn.1000.758X.2014.04.005 Abstract ( 1569 )   PDF (767KB) ( 1262 )   Save Forthenumericaloptimizationanalysisonthefoldinganddeploymentprocessofthesolarsailmembrane,askewleafoutfoldingpatternwasfirstlyproposedbasedontheleafinandleafoutfoldingpatterns.Fivefoldingmodelswithdifferentfoldingparameterswerebuiltuponthethreefoldingpatterns.ThefiniteelementsoftwareANSYS/LSDYNAwasusedtosimulatethedeploymentofthesefoldingpatterns.Theresultshowsthatsolarsailmembranestressalongthedeploymentprocessisrelatedtothedeploymentspeedandfoldingwidth.Theareaclosetothevertexofsquaresolarsailmembranehasthehigheststress,andshouldbereinforced.Theskewleafoutfoldingpatternisthemostappropriatefoldingpatternforthesolarsailmembrane. Related Articles | Metrics

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RealtimePredictionAlgorithmforHighaccuracyGPSSatelliteClockOffset LEI Yu, LI Bian, ZHAO Dan-Ning, HU Yong-Hui 2014, 34 (4):  38.  doi: 10.3780/j.issn.1000.758X.2014.04.006 Abstract ( 1359 )   PDF (652KB) ( 931 )   Save InordertogetrealtimeGPSclockproductsofhighaccuracy,anewpredictionalgorithmwasproposed,whichincorporatedapolynomialmodelwithafewcyclictermsandleastsquaressupportvectormachines(LSSVM)forclockoffset.Firstly,apolynomialmodeladdingafewcyclictermswasutilizedtofittheclockoffsetseriesaccordingtothephysicalcharacteristicsofsatelliteclockssoastoextractthetrendtermandperiodicterm.Then,thepolynomialfittingresidualsweremodeledbasedontheLSSVM.Finally,thetrendtermandperiodictermwereaddedtotheforecastedresidualresulttoproducethefinalpredictionvaluefortheclockoffset.TheIGSultrarapidobserved(IGUO)productswereemployedastheinitialvaluesofthepredictionstrategy.Thesimulationresultsdemonstratethattheproposedalgorithmcanbeusedtopredictclockoffsetwithhighaccuracyinrealtime,andoutperformstheIGSultrarapidpredicted(IGUP)solutionsatleastonadailybasis. Related Articles | Metrics

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SpectralAnalysisforSubpixelMaterialsBasedonKernelPartialNonnegativeMatrixFactorization CUI Jian-Tao, LI Xiao-Run, ZHAO Liao-Ying 2014, 34 (4):  46.  doi: 10.3780/j.issn.1000.758X.2014.04.007 Abstract ( 1253 )   PDF (810KB) ( 729 )   Save Toimprovetheaccuracyofspectralanalysisforsubpixelmaterialsfurther,anonlinearunmixingalgorithmbasedonthekernelpartialnonnegativematrixfactorization(KPNMF)wasproposed.Firstly,anendmemberextractionalgorithmbasedonthetheoryofconvexgeometrywasusedtogenerateacandidatepixelsetofpureendmembers,andthenthepureendmemberwasdeterminedaccordingtothespatialpurityindicesofthecandidatepixels.Giveninformationofpureendmembers,thekernelmethodwasadoptedtoextendpartialnonnegativematrixfactorization(PNMF).Thecorrespondingobjectivefunctionwasconstructed,andtheiterativesolutionwasalsoderivedtoobtainthesubpixelendmembersandabundancesofalltheendmembers.Theexperimentalresultsdemonstratethattheproposedunmixingalgorithmhasgoodnonlinearunmixingability,andtheunmixingresultsarebetterthanthoseoflinearunmixingalgorithms. Related Articles | Metrics

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SerialMPPTElectricalPowerSystemStabilityforSpaceApplication LIN Wen-Li, ZHANG Xiao-Feng, DU Qing, WANG Chao 2014, 34 (4):  53.  doi: 10.3780/j.issn.1000.758X.2014.04.008 Abstract ( 1708 )   PDF (578KB) ( 1224 )   Save Instabilityphenomenasuchasbusvoltagefluctuations occurinserialmaximumpowerpointtracking(MPPT)electricalpowersystem(EPS).Tostudythestability, systemequivalentcircuitmodelswerebuiltbasedonaserialMPPTunregulatedbusEPStopologyforspaceapplication.ThesmallsignalequivalentanalysismethodandeigenvaluesofstatespaceequationssolvingmethodwereadoptedtoperformstabilityanalysisintheMPPTcontroldomainandthevoltagecontroldomain.Keyconclusionsareobtainedundertheconditionsofconstantsolararray(SA)andarraypowerregulator(APR)characteristics.ThesystemstabilitydependsontheparametersofinductorsandcapacitorsbetweentheSAandAPR.AserialMPPTunregulatedbusEPSmodelisbuiltinMATLAB/SIMULINK,andthesimulationresultsvalidatetheaboveconclusions. Related Articles | Metrics

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MethodforPredictingExtremeTemperatureConditionsofSatelliteControlAntennaswithSolarHeating MA Wei-Chao, ZHU Min-Bo, YE Hai-Yang, LIAN Pei-Yuan 2014, 34 (4):  59.  doi: 10.3780/j.issn.1000.758X.2014.04.009 Abstract ( 1529 )   PDF (702KB) ( 1259 )   Save Consideringtheproblemsoftheelectricalpropertiesareaffectedbythermaldeformationofsatellitecontrolantenna,apredictionmethodfortheextremetemperatureconditionsofsatellitecontrolantennawaspresented.Inthemethod,thesolarradiationwascombinedwiththeparabolicantennapanelequationtocalculatethesolardirectpointtrajectoryofsatellitecontrolantennas,anddeterminedtheantennapositionparameters.Thevariousenvironmentalfactorsofantennaweretakenintoaccountandtheextremeconditionsoftheantennawerepredicted.Comparedwiththesimulationandexperimentalresults,thereliabilityofthedirectsunlightpointtrajectorycalculationmethodandthepredictionmethodsoftheextremetemperatureconditionsareverified. Related Articles | Metrics

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WeakGNSSSignalsAcquisitionAlgorithmUsingTwo-stageFFT SU Yue, WANG Jian-Hui 2014, 34 (4):  66.  doi: 10.3780/j.issn.1000.758X.2014.04.010 Abstract ( 1333 )   PDF (595KB) ( 1206 )   Save ToimprovetheimplementationflexibilityofGNSSweaksignalacquisitioninthehighdynamicenvironments,anacquisitionalgorithmincludingtwostagefastFouriertransform(FFT)wasdeveloped.Inthefirststage,theshortcoherentintegrationtimewasemployedtodividetheDopplerfrequencyrangeintoseveralsub-rangescalledcoarseDopplerfrequencybins.Inthesecondstage,thefineDopplerfrequencysearchingwascompletedbasedontheoutputofthefirststageFFT.ThepresentedmethodcanreducethenumberofFFTpointsandtheimplementationcomplexity.Besides,thepipelineprocessingwasusedinthefirststageFFT,whichcouldincreasetheefficiencyofhardwaresource.ThesimulationresultsshowthatthepresentedmethodcanacquireweakGNSSsignalscorrectlyinhighdynamicscenarios. Related Articles | Metrics

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ExperimentofIonizingRadiationInducedArrayChargeCoupledDevicesDarkSignalIncrease WANG Zu-Jun, LUO Tong-Ding, YANG Shao-Hua, LIU Min-Bo, SHENG Jiang-Kun 2014, 34 (4):  72.  doi: 10.3780/j.issn.1000.758X.2014.04.011 Abstract ( 1559 )   PDF (818KB) ( 1253 )   Save ToresearchtheionizingradiationeffectsonChargeCoupledDevices(CCD)inspaceorbitenvironments,theexperimentsofionizingradiationeffectsonarrayCCDswerepresented.TheoutputsignalsversusintegrationtimeweremeasuredwhennolightwasincidentonthearrayCCDs.Thedarksignalslope(KD)andthedarksignalvoltages(VD)versusthetotaldoseswerepresented.Thedegradationsofdarksignalsversusthetotaldosesunderthedifferentbiasconditionswerecompared.Themechanismsofdarksignaldegradationinducedbyionizingradiationweredemonstrated.Theannealrecoveryofdarksignalwasalsomeasured.Thedarksignalnonuniformity(DSNU)versusintegrationtimeatdifferenttotaldoseswasanalyzed.TheexperimentalresultsshowthatthearrayCCDsareverysensitivetotheionizingdamage,andthedesignofthespaceimagingsystemshouldconsidertheinfluenceinducedbyionizingdamage.Theresultsprovideagoodunderstandingofthedegradations andmechanismsofthedarksignalinthearrayCCDinducedbyionizingdamage. Related Articles | Metrics

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FaultManagementDesignofNHTX-1SATServiceSystem CHEN Zhi-Ming, LIU Hai-Ying, YE Wei-Song 2014, 34 (4):  79.  doi: 10.3780/j.issn.1000.758X.2014.04.012 Abstract ( 1706 )   PDF (567KB) ( 1391 )   Save ThegeneralinformationandthetaskservicesystemdesignofNHTX-1SATwereintroduced.NHTX-1SATisalowpowerconsumptionandhighfunctionintegrationsatellite,andthedataservicesystemistheonlycentraldataprocessingsystemthatintegratessatelliteattitudecontrolandtaskmanagementcapabilities.Basedonthesefeatures,thehardwareandsoftwaresweredesignedforthefailurepreventionmeasuresandtroubleshootingprograms,suchasthepowersafetyinsuranceandsoftwarefaulttolerancetoimprovesystemreliabilityandsafety. Related Articles | Metrics