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25 August 2016, Volume 36 Issue 4 Previous Issue    Next Issue

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Modeling and analysis on the long-term evolution of the space debris cloud ZHANG Bin-Bin, WANG Zhao-Kui, ZHANG Yu-Lin 2016, 36 (4):  1.  doi: 10.16708/j.cnki.1000-758X.2016.0046 Abstract ( 1309 )   PDF (6080KB) ( 1658 )   Save Aspacedebriscloudconsistsofnumerousbreakupfragmentswhichareoriginatedfromaninstinctspaceobject.Asthebreakupfragmentsareinaconcentrateddistribution，thosespacecraftintheneighborhoodofthebreakupobjectswillfaceaseriousthreatofcollision.Inordertoevaluatethelongtermevolutionofspacedebris，thepropagationofspacedebriscloudforashorttermperiodwasanalyzednumerically.Basedonthestabledistributioncharacteristicofthedebriscloud，fragmentsweredividedintoseveralgroupsaccordingtotheirorbitalheightsandareamassratios.Thelongtermdistributionundertheperturbationofatmospheredragwasdescribedbyananalyticevolutionmodel.Comparing〖JP2〗withallthefragmentspropagatingindividually，theanalyticmodelwasmoreefficientandlesstimeconsuming.Theevolutionofabreakupdebriscloudconsists1780breakupfragments，andwasobtairedforthenextfiftyyears.Resultsshowthatthepeakspatialdensityofthedebriscloudisaroundtheheightofthebreakupobjectandwillspreadintoabroaderheightintervalcontinuously,andthefragmentsinthelowerheightintervalwillfirstlyincreaseandthendecreaseundertheperturbationofairdrag. Related Articles | Metrics

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Anefficientstellarmapidentificationmethodbasedoncharacterizedgraphicsmatchingmethod LI Chao-Bing, YUAN Yan-Yan, WANG Dan-Ye 2016, 36 (4):  9.  doi: 10.16708/j.cnki.1000-758X.2016.0047 Abstract ( 1568 )   PDF (4863KB) ( 2581 )   Save Nowadays,starpatternrecognitionmethodsusedonstarsensorshaveshortcomingsofredundancymatch,matchingslow,lowrecognitionrate，andsoon.Toovercomethis，thestarpatternrecognitionalgorithmwasstudied，andanewalgorithmwasproposed.Firstly,redundancyinformationfromtraditionalstarcatalogwasextracted.Theskycoveragewasdividedtomakesurethatdifferentskycoveragehasthesimilarnavstarnumber.Secondly，featureinformationfromthephotowasextractedtomatchthefeatureinformationdatabase.Afterthealgorithmwasdesigned,thestarsensorswiththefieldofview15°×15°wereselectedandsimulated.Simulationresultsshowthatthematchingofthewholeskycanbefinishedin15sbythisalgorithm,andthesuccessratecanreachover98%. Related Articles | Metrics

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Inertiaparameteridentificationofonorbituncooperativeobject KONG Xiang-Long, LI Wen-Long, LI Wen-Feng, ZHAO Yi 2016, 36 (4):  17.  doi: 10.16708/j.cnki.1000-758X.2016.0042 Abstract ( 1379 )   PDF (952KB) ( 1581 )   Save Mostalgorithmsofinertiaparametersidentificationassumedthesystemmomentumknownandfewattentionwaspaidtotheattitudestabilizationofbase.Anincrementalformoftheidentificationequationwasgivenbasedontheconservationprincipleofmomentumandafractionalstepmethodwasproposed.Firstly,estimationequationsaboutthemassandpositionofmasscenterwereobtainedandtheunknownconstantlinearmomentumwaseliminatedinincrementalformulation.Theestimateoflinearmomentumwascalculatedwiththeestimatedparametersandthensubstitutedintoestimationequationsabouttheinertiatensors.Theincrementalequationswereobtainedagaintoeliminatetheunknownconstantangularmomentum.Anadaptivereactionlesscontrollerwasusedtopersistentlyexcitetherobotarm,whichguaranteedtheconvergenceofthealgorithmaswellasthestabilizationofbaseattitude.Simulationsresultsshowthatinertialparametersareaccuratelyidentifiedandtheangularvelocitiesofthebasearelessthan10-3,whichcanbeviewedasnearlyundisturbed. Related Articles | Metrics

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Faultdiagnosisofreactionwheelinsatelliteformation WANG Jia-Yi, WEN Xin, ZHANG Wan-Yi 2016, 36 (4):  24.  doi: 10.16708/j.cnki.1000-758X.2016.0048 Abstract ( 1515 )   PDF (3180KB) ( 1425 )   Save Thetechnologyofsatelliteformationflyingisanewtechnologyinthefieldofspace.Multiplelowcostsmallsatellitesareabletocompletemoredifficultspacemissions,butatthesametimetherearemorefaultdiagnosis.Aimingattheproblemsthatthesatelliteformationmayoccurincomplexspaceenvironment，adistributedswarmsystemofsatellitesforfaultdiagnosismethodbasedonElmanneuralnetworkwasproposed.Theexperimentalresultsshowthattheproposedschemecandetectthefaultofthereactionwheels,andtheadjacentsatellitecanalsodetectthefaults,whichisverygoodandrealtimeandiseffectiveandfeasibleinpracticalapplication. Related Articles | Metrics

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Surfaceaccuracyadjustingmethodoflargeflexiblemeshspaceborneantennaonground WANG Hui, SONG Yan-Ping, MA Xiao-Fei 2016, 36 (4):  33.  doi: 10.16708/j.cnki.1000-758X.2016.0040 Abstract ( 1288 )   PDF (837KB) ( 1265 )   Save Thedeformationoflargeflexiblemeshantennaundergravityloadisremarkableandmixedwiththemanufacturingerror，whichbringtremendoustroublestothesurfaceaccuracyadjustingwork.Tosolvetheproblem,firstly,thearticleexpatiatedallkindsofsurfaceerrorsexistinginthereflectormanufacturingandworking;secondly,thearticleprovidedandcertifiedthecorrelationsamongtheerrorsespeciallymanufacturingerrorandsurfaceerrorswhenthereflectorisputCupupandCupdown.Byapplyingthosecorrelations,theeffectonthereflectorsurfaceerrorboughtbygravitycouldbedecreased,whichprovidedgreatadvantageforsurfaceaccuracyadjustingonground.Tomeettheengineeringrequirement,aflowchartofhowthesurfaceaccuracywouldbeadjustedwasproduced.Itcanreducethereversalfrequencyofreflectorandsavetimeduringsurfaceaccuracyadjusting. Related Articles | Metrics

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Performanceevaluationofroutingalgorithmsonspacedelay/disruptiontolerantnetworks YAN Hong-Cheng, GUO Jian, ZHANG Hong-Jun 2016, 36 (4):  38.  doi: 10.16708/j.cnki.1000-758X.2016.0038 Abstract ( 1187 )   PDF (1037KB) ( 1767 )   Save Performanceofroutingalgorithmsonspacedelay/disruptiontolerantnetworks(DTN)wasevaluatedtoprovidedesignreferenceandadvicesforfuturedesignofroutingtechniquesonspaceDTN.Firstly,routingalgorithmsapplicabletospaceDTNwereanalyzedandcomparedinaspectofutilizationamountofnetworkknowledege.Then,frommicroscopicandmacroscopicaspects,fourtypicalspaceDTNroutingalgorithms,whichareearliestdelivery（ED）,earliestdeliverywithlocalqueue（EDLQ）,contactgraphrouting（CGR）andcontactgraphroutingearliesttransmissionopportunity（CGRETO）,wereevaluatedbysimulationsinatypicalspaceDTNscenariowithdifferentcontactplanconfigurations.Finally,evaluationresultswereanalyzedandsummarized,andfutureresearchissuesaboutroutingalgorithmsonspaceDTNwerealsodiscussed.Simulationresultsindicatethatfromaspectsofendtoenddelayandbundledeliverycompletionratio,theperformanceofCGRisbetterthanEDwhiletheperformanceofEDLQandCGRETOarethesamebest. Related Articles | Metrics

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AfullblindPIMsuppressionalgorithmforspreadspectrumTT&Clink AN Jin-Kun, TIAN Lin, DING Kai 2016, 36 (4):  47.  doi: 10.16708/j.cnki.1000-758X.2016.0043 Abstract ( 1104 )   PDF (939KB) ( 1587 )   Save Focusingonthepassiveintermodulation(PIM)probleminspreadspectrumschemeTT&Clink,awaveletpacketdecompositionbasedfullblindPIMsuppressionalgorithmwasproposed.MultilayerswaveletpacketdecompositionwasemployedonthereceivedspreadspectrumTT&Csignals,accordingtothecharacteristicthedecomposedsignalshouldobeyGaussiandistribution,andinterferencesuppressionwasachieved,NosuppressiongatewassetduringthewholeprocessandthiswasafullblindPIMsuppressedalgorithm.Finally,Matlabsimulationresultshowsthat7dBsignalinterferenceratiogaincanbeobtained. Related Articles | Metrics

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EffectofcircuitparametersonstartuptransientcurrentofHallthrusters DU Jian-Hua, HU Jun-Feng, YANG Zi-Yi 2016, 36 (4):  51.  doi: 10.16708/j.cnki.1000-758X.2016.0045 Abstract ( 1208 )   PDF (2580KB) ( 1271 )   Save Basedontheanalysisoftheformationmechanismofthepulsecurrentinthepowersupplysideduringthestartuptransient,therelationshipbetweentheoutercircuitparametersandthepulsecurrentpeekinthepowersupplysidewasstudiedbytheanalysisandexperimentsundervaryingparameters.Resultsshowthatthepulsecurrentonthepowersupplysidedecreaseswiththeincreaseofcapacitanceandinductance.Basedonthededucedfunctionofpeakpulsecurrentonthepowersupplyside,theeffectsofcapacitanceandinductanceonthepowersupplypulsecurrentduringaHallthrusterstartuptransientwasstudied.Therequirementoftheturn,magneticcoresectionalarea,andtheBHcurveofselectedinductorwasdiscussed.ThisresearchcanprovidereferencefortheoutercircuitparameterdesigninHallthrusters. Related Articles | Metrics

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LifetimepredictionofaerospaceequipmentbasedonDSevidencetheory DING Rui, LU Ning-Yun, CHENG Yue-Hua, JIANG Bin, XING Yan 2016, 36 (4):  58.  doi: 10.16708/j.cnki.1000-758X.2016.0044 Abstract ( 1374 )   PDF (983KB) ( 705 )   Save AninformationfusionmethodwasproposedbasedonDSevidencetheoryandBayestheoryforlifetimepredictionofimportantaerospaceequipment,momentumwheel.Firstly,multisourcelifeinformationwerecollectedandminedtoobtainthepriordistributionofthemomentumwheel′slifetime,inordertobuildDSevidencecollections.Secondly,DScombinationrulewasusedtoobtainreasonableweightallocationforpriordistributions.Afterthat,fusionposteriordistributionwasfiguredoutandthevaluesoflifeparameterswerealsoestimated.Finally,accordingtoparameters′estimation,thelifetimepredictionformomentumwheelwasderived.Simulationresultshowsthatthepredictionusingtheproposedmethodisclosertothereallifetimemeasurements. Related Articles | Metrics

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Amethodoforbitdesignbasedonpreciserevisitofagivengroundtrack WEI Guo-Ning, LUO Jian, KANG Zhi-Yu, TANG Sheng-Yong, CHEN Xiao-Guang 2016, 36 (4):  67.  doi: 10.16708/j.cnki.1000-758X.2016.0049 Abstract ( 1427 )   PDF (2691KB) ( 1334 )   Save Aneworbitdesignmethodisneededforpreciserevisitthegivengroundtrackpoints.Amethodofdesigningpreciserevisitof2givengroundtrackroundrepeatingorbitwasproposed.Therelationshipbetweenthesatellitegeocentricvectorandthegroundtrackgeocentricvectorwasanalyzed;theproblemwasconvertedtothecoincidenceproblemintheinertialcoordinatesystemofamotionvectorininertialcoordinatesystemandaconstantvectorinthemovingcoordinatesystem.Differenttargetfunctionswereconstructed,whileorbitelementswereobtainedbysearchingthezerosofthecorrespondingfunction.Calculationandsimulationresultsdemonstratetheeffectivenessoftheproposedapproach. Related Articles | Metrics

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AnalysisandsimulationonMEMSgyrorotarynavigationerror ZHOU Qiong-Feng, KANG Guo-Hua, CHEN Xue-Fen 2016, 36 (4):  74.  doi: 10.16708/j.cnki.1000-758X.2016.0039 Abstract ( 1511 )   PDF (928KB) ( 1293 )   Save Currently,theresearchandapplicationhasbeenquitematureonrotatingmodulationtechnologyofnavigationbasedonhighprecisiongyroscope.TherotatingmodulationtechnologywasintroducedtorealizehighprecisionapplicationofthelowprecisionMEMSgyroscope.Accordingtothetheoreticalanalysisandsimulationofnavigationerrorwithrotatingmodulationornot,theeffectsondifferentprecisiongyroscopewerecomparedunderthesamecondition.Aswell,thefactorsthatinfluencedthemodulationresultwasanalyzedindetail.Itturnsoutthat,comparedtohighprecisiongyroscope,therotationmodulationeffectoflowprecisionMEMSgyroscopeismoreobviousinthesamecondition,andmorethan30%navigationerrorisreducedinthe100sduetorotation.Inaddition,developinghighprecisionrotatingmodulationturntableisalsooneofthekeytechnologiesofimprovingtheaccuracyoftheMEMSgyroscoperotationmodulation. Related Articles | Metrics

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Modelinganalysisofslowstartupcircuitsofspacecooling LI Wen-Ran 2016, 36 (4):  81.  doi: 10.16708/j.cnki.1000-758X.2016.0041 Abstract ( 1060 )   PDF (3927KB) ( 1503 )   Save Withmorepowerfulspacestirlingcoolercomingout,ifthecontrollerstillusestraditionalslowstartupandLCenergystorageandfilteringseriescircuits,anunstableandlargeovershootstartupcurrentwillbecaused,whichleadstothecontrollerovercurrentprotectionandpotentialsurgedamagestosatellitepowerandotherdevices.Undertheconditionofnotaddingcomponents,aslowstartupcircuitconnectingLCenergystorageandfilteringcircuitcooperativewaywithstartupcurrentfeedbackfunctionwasproposed.Firstly,thenewandoldcooperativecircuitswithlowfrequencyequivalentmodelofnonlinearMOSFETweremodeled.Secondly,themodelsbothintheconditionofsmallinductanceandsmallcapacitanceandintheconditionoflargeinductanceandlargecapacitanceweresimplifiedandanalyzed.Intheconditionofsmallinductanceandsmallcapacitance,bothcooperativecircuitscanbesimplifiedtononovershotfirstordersystem.Intheconditionoflargeinductanceandlargecapacitance,thetraditionalcooperativecircuitswassimplifiedtosecondordersystemwithoscillationcharacteristics.However,thenewcooperativecircuitsisstillfirstordersystem,whichsatisfiestherequirementsofnonovershootstartupcurrentintheconditionoflargeinductanceandlargecapacitance.Finally,thesimulationcontrastiveanalysisandexperimentalverificationwasusedtoproofthenewcooperativecircuitsrationalityandeffectiveness.Thetestshowsthestartupcurrentstableandnoovershootandthepeakofthestartupcurrentisrestraineduptoabout50%. Related Articles | Metrics