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中国空间科学技术
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25 August 2016, Volume 36 Issue 4
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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
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1343
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Aspacedebriscloudconsistsofnumerousbreakupfragmentswhichareoriginatedfromaninstinctspaceobject.Asthebreakupfragmentsareinaconcentrateddistribution,thosespacecraftintheneighborhoodofthebreakupobjectswillfaceaseriousthreatofcollision.Inordertoevaluatethelongtermevolutionofspacedebris,thepropagationofspacedebriscloudforashorttermperiodwasanalyzednumerically.Basedonthestabledistributioncharacteristicofthedebriscloud,fragmentsweredividedintoseveralgroupsaccordingtotheirorbitalheightsandareamassratios.Thelongtermdistributionundertheperturbationofatmospheredragwasdescribedbyananalyticevolutionmodel.Comparing〖JP2〗withallthefragmentspropagatingindividually,theanalyticmodelwasmoreefficientandlesstimeconsuming.Theevolutionofabreakupdebriscloudconsists1780breakupfragments,andwasobtairedforthenextfiftyyears.Resultsshowthatthepeakspatialdensityofthedebriscloudisaroundtheheightofthebreakupobjectandwillspreadintoabroaderheightintervalcontinuously,andthefragmentsinthelowerheightintervalwillfirstlyincreaseandthendecreaseundertheperturbationofairdrag.
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Anefficientstellarmapidentificationmethodbasedoncharacterizedgraphicsmatchingmethod
LI Chao-Bing, YUAN Yan-Yan, WANG Dan-Ye
2016, 36 (
4
): 9. doi:
10.16708/j.cnki.1000-758X.2016.0047
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1630
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Nowadays,starpatternrecognitionmethodsusedonstarsensorshaveshortcomingsofredundancymatch,matchingslow,lowrecognitionrate,andsoon.Toovercomethis,thestarpatternrecognitionalgorithmwasstudied,andanewalgorithmwasproposed.Firstly,redundancyinformationfromtraditionalstarcatalogwasextracted.Theskycoveragewasdividedtomakesurethatdifferentskycoveragehasthesimilarnavstarnumber.Secondly,featureinformationfromthephotowasextractedtomatchthefeatureinformationdatabase.Afterthealgorithmwasdesigned,thestarsensorswiththefieldofview15°×15°wereselectedandsimulated.Simulationresultsshowthatthematchingofthewholeskycanbefinishedin15sbythisalgorithm,andthesuccessratecanreachover98%.
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Inertiaparameteridentificationofonorbituncooperativeobject
KONG Xiang-Long, LI Wen-Long, LI Wen-Feng, ZHAO Yi
2016, 36 (
4
): 17. doi:
10.16708/j.cnki.1000-758X.2016.0042
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Mostalgorithmsofinertiaparametersidentificationassumedthesystemmomentumknownandfewattentionwaspaidtotheattitudestabilizationofbase.Anincrementalformoftheidentificationequationwasgivenbasedontheconservationprincipleofmomentumandafractionalstepmethodwasproposed.Firstly,estimationequationsaboutthemassandpositionofmasscenterwereobtainedandtheunknownconstantlinearmomentumwaseliminatedinincrementalformulation.Theestimateoflinearmomentumwascalculatedwiththeestimatedparametersandthensubstitutedintoestimationequationsabouttheinertiatensors.Theincrementalequationswereobtainedagaintoeliminatetheunknownconstantangularmomentum.Anadaptivereactionlesscontrollerwasusedtopersistentlyexcitetherobotarm,whichguaranteedtheconvergenceofthealgorithmaswellasthestabilizationofbaseattitude.Simulationsresultsshowthatinertialparametersareaccuratelyidentifiedandtheangularvelocitiesofthebasearelessthan10
-3
,whichcanbeviewedasnearlyundisturbed.
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Faultdiagnosisofreactionwheelinsatelliteformation
WANG Jia-Yi, WEN Xin, ZHANG Wan-Yi
2016, 36 (
4
): 24. doi:
10.16708/j.cnki.1000-758X.2016.0048
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1545
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Thetechnologyofsatelliteformationflyingisanewtechnologyinthefieldofspace.Multiplelowcostsmallsatellitesareabletocompletemoredifficultspacemissions,butatthesametimetherearemorefaultdiagnosis.Aimingattheproblemsthatthesatelliteformationmayoccurincomplexspaceenvironment,adistributedswarmsystemofsatellitesforfaultdiagnosismethodbasedonElmanneuralnetworkwasproposed.Theexperimentalresultsshowthattheproposedschemecandetectthefaultofthereactionwheels,andtheadjacentsatellitecanalsodetectthefaults,whichisverygoodandrealtimeandiseffectiveandfeasibleinpracticalapplication.
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Surfaceaccuracyadjustingmethodoflargeflexiblemeshspaceborneantennaonground
WANG Hui, SONG Yan-Ping, MA Xiao-Fei
2016, 36 (
4
): 33. doi:
10.16708/j.cnki.1000-758X.2016.0040
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1309
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Thedeformationoflargeflexiblemeshantennaundergravityloadisremarkableandmixedwiththemanufacturingerror,whichbringtremendoustroublestothesurfaceaccuracyadjustingwork.Tosolvetheproblem,firstly,thearticleexpatiatedallkindsofsurfaceerrorsexistinginthereflectormanufacturingandworking;secondly,thearticleprovidedandcertifiedthecorrelationsamongtheerrorsespeciallymanufacturingerrorandsurfaceerrorswhenthereflectorisputCupupandCupdown.Byapplyingthosecorrelations,theeffectonthereflectorsurfaceerrorboughtbygravitycouldbedecreased,whichprovidedgreatadvantageforsurfaceaccuracyadjustingonground.Tomeettheengineeringrequirement,aflowchartofhowthesurfaceaccuracywouldbeadjustedwasproduced.Itcanreducethereversalfrequencyofreflectorandsavetimeduringsurfaceaccuracyadjusting.
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Performanceevaluationofroutingalgorithmsonspacedelay/disruptiontolerantnetworks
YAN Hong-Cheng, GUO Jian, ZHANG Hong-Jun
2016, 36 (
4
): 38. doi:
10.16708/j.cnki.1000-758X.2016.0038
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1214
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Performanceofroutingalgorithmsonspacedelay/disruptiontolerantnetworks(DTN)wasevaluatedtoprovidedesignreferenceandadvicesforfuturedesignofroutingtechniquesonspaceDTN.Firstly,routingalgorithmsapplicabletospaceDTNwereanalyzedandcomparedinaspectofutilizationamountofnetworkknowledege.Then,frommicroscopicandmacroscopicaspects,fourtypicalspaceDTNroutingalgorithms,whichareearliestdelivery(ED),earliestdeliverywithlocalqueue(EDLQ),contactgraphrouting(CGR)andcontactgraphroutingearliesttransmissionopportunity(CGRETO),wereevaluatedbysimulationsinatypicalspaceDTNscenariowithdifferentcontactplanconfigurations.Finally,evaluationresultswereanalyzedandsummarized,andfutureresearchissuesaboutroutingalgorithmsonspaceDTNwerealsodiscussed.Simulationresultsindicatethatfromaspectsofendtoenddelayandbundledeliverycompletionratio,theperformanceofCGRisbetterthanEDwhiletheperformanceofEDLQandCGRETOarethesamebest.
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AfullblindPIMsuppressionalgorithmforspreadspectrumTT&Clink
AN Jin-Kun, TIAN Lin, DING Kai
2016, 36 (
4
): 47. doi:
10.16708/j.cnki.1000-758X.2016.0043
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Focusingonthepassiveintermodulation(PIM)probleminspreadspectrumschemeTT&Clink,awaveletpacketdecompositionbasedfullblindPIMsuppressionalgorithmwasproposed.MultilayerswaveletpacketdecompositionwasemployedonthereceivedspreadspectrumTT&Csignals,accordingtothecharacteristicthedecomposedsignalshouldobeyGaussiandistribution,andinterferencesuppressionwasachieved,NosuppressiongatewassetduringthewholeprocessandthiswasafullblindPIMsuppressedalgorithm.Finally,Matlabsimulationresultshowsthat7dBsignalinterferenceratiogaincanbeobtained.
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EffectofcircuitparametersonstartuptransientcurrentofHallthrusters
DU Jian-Hua, HU Jun-Feng, YANG Zi-Yi
2016, 36 (
4
): 51. doi:
10.16708/j.cnki.1000-758X.2016.0045
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1228
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Basedontheanalysisoftheformationmechanismofthepulsecurrentinthepowersupplysideduringthestartuptransient,therelationshipbetweentheoutercircuitparametersandthepulsecurrentpeekinthepowersupplysidewasstudiedbytheanalysisandexperimentsundervaryingparameters.Resultsshowthatthepulsecurrentonthepowersupplysidedecreaseswiththeincreaseofcapacitanceandinductance.Basedonthededucedfunctionofpeakpulsecurrentonthepowersupplyside,theeffectsofcapacitanceandinductanceonthepowersupplypulsecurrentduringaHallthrusterstartuptransientwasstudied.Therequirementoftheturn,magneticcoresectionalarea,andtheBHcurveofselectedinductorwasdiscussed.ThisresearchcanprovidereferencefortheoutercircuitparameterdesigninHallthrusters.
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LifetimepredictionofaerospaceequipmentbasedonDSevidencetheory
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
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AninformationfusionmethodwasproposedbasedonDSevidencetheoryandBayestheoryforlifetimepredictionofimportantaerospaceequipment,momentumwheel.Firstly,multisourcelifeinformationwerecollectedandminedtoobtainthepriordistributionofthemomentumwheel′slifetime,inordertobuildDSevidencecollections.Secondly,DScombinationrulewasusedtoobtainreasonableweightallocationforpriordistributions.Afterthat,fusionposteriordistributionwasfiguredoutandthevaluesoflifeparameterswerealsoestimated.Finally,accordingtoparameters′estimation,thelifetimepredictionformomentumwheelwasderived.Simulationresultshowsthatthepredictionusingtheproposedmethodisclosertothereallifetimemeasurements.
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Amethodoforbitdesignbasedonpreciserevisitofagivengroundtrack
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
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1456
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Aneworbitdesignmethodisneededforpreciserevisitthegivengroundtrackpoints.Amethodofdesigningpreciserevisitof2givengroundtrackroundrepeatingorbitwasproposed.Therelationshipbetweenthesatellitegeocentricvectorandthegroundtrackgeocentricvectorwasanalyzed;theproblemwasconvertedtothecoincidenceproblemintheinertialcoordinatesystemofamotionvectorininertialcoordinatesystemandaconstantvectorinthemovingcoordinatesystem.Differenttargetfunctionswereconstructed,whileorbitelementswereobtainedbysearchingthezerosofthecorrespondingfunction.Calculationandsimulationresultsdemonstratetheeffectivenessoftheproposedapproach.
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AnalysisandsimulationonMEMSgyrorotarynavigationerror
ZHOU Qiong-Feng, KANG Guo-Hua, CHEN Xue-Fen
2016, 36 (
4
): 74. doi:
10.16708/j.cnki.1000-758X.2016.0039
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Currently,theresearchandapplicationhasbeenquitematureonrotatingmodulationtechnologyofnavigationbasedonhighprecisiongyroscope.TherotatingmodulationtechnologywasintroducedtorealizehighprecisionapplicationofthelowprecisionMEMSgyroscope.Accordingtothetheoreticalanalysisandsimulationofnavigationerrorwithrotatingmodulationornot,theeffectsondifferentprecisiongyroscopewerecomparedunderthesamecondition.Aswell,thefactorsthatinfluencedthemodulationresultwasanalyzedindetail.Itturnsoutthat,comparedtohighprecisiongyroscope,therotationmodulationeffectoflowprecisionMEMSgyroscopeismoreobviousinthesamecondition,andmorethan30%navigationerrorisreducedinthe100sduetorotation.Inaddition,developinghighprecisionrotatingmodulationturntableisalsooneofthekeytechnologiesofimprovingtheaccuracyoftheMEMSgyroscoperotationmodulation.
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Modelinganalysisofslowstartupcircuitsofspacecooling
LI Wen-Ran
2016, 36 (
4
): 81. doi:
10.16708/j.cnki.1000-758X.2016.0041
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1082
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Withmorepowerfulspacestirlingcoolercomingout,ifthecontrollerstillusestraditionalslowstartupandLCenergystorageandfilteringseriescircuits,anunstableandlargeovershootstartupcurrentwillbecaused,whichleadstothecontrollerovercurrentprotectionandpotentialsurgedamagestosatellitepowerandotherdevices.Undertheconditionofnotaddingcomponents,aslowstartupcircuitconnectingLCenergystorageandfilteringcircuitcooperativewaywithstartupcurrentfeedbackfunctionwasproposed.Firstly,thenewandoldcooperativecircuitswithlowfrequencyequivalentmodelofnonlinearMOSFETweremodeled.Secondly,themodelsbothintheconditionofsmallinductanceandsmallcapacitanceandintheconditionoflargeinductanceandlargecapacitanceweresimplifiedandanalyzed.Intheconditionofsmallinductanceandsmallcapacitance,bothcooperativecircuitscanbesimplifiedtononovershotfirstordersystem.Intheconditionoflargeinductanceandlargecapacitance,thetraditionalcooperativecircuitswassimplifiedtosecondordersystemwithoscillationcharacteristics.However,thenewcooperativecircuitsisstillfirstordersystem,whichsatisfiestherequirementsofnonovershootstartupcurrentintheconditionoflargeinductanceandlargecapacitance.Finally,thesimulationcontrastiveanalysisandexperimentalverificationwasusedtoproofthenewcooperativecircuitsrationalityandeffectiveness.Thetestshowsthestartupcurrentstableandnoovershootandthepeakofthestartupcurrentisrestraineduptoabout50%.
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