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    25 December 2016, Volume 36 Issue 6 Previous Issue    Next Issue
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    Review of reentry guidance methods for hypersonic gliding vehicles
    LIU Si-Yuan, LIANG Zi-Xuan, REN Zhang, LI Qing-Dong
    2016, 36 (6):  1-13.  doi: 10.16708/j.cnki.1000-758X.2016.0066
    Abstract ( 568 )   PDF (2250KB) ( 1117 )   Save
    Thedevelopmentofreentryguidancemethodsforhypersonicglidingvehicleswasreviewed.Firstly,thedynamicsofareentryvehiclewasestablished.Thepathconstraints,theterminalconstraintsandthegeographicconstraintswereanalyzedforareentryflight.Secondly,longitudinalreentryguidancealgorithmsweredividedintothreecategories:thetrajectorytrackingmethod,thepredictorcorrectormethod,andthehybridmethod.Lateralreentryguidancealgorithmsweredividedintotwocategories:guidancefortheconventionalconstraintsandguidanceforthegeographicconstraints.Reviewswerepresentedforthethreelongitudinalguidancemethodsandthetwolateralguidancemethods.Finally,theguidancetechnologywasprospectedforhypersonicglidingvehiclesaccordingtoflightmissionsinthefuture.
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    Deploymentstrategyoptimizationofonorbitservicingsystemforrefuelinggeosynchronousorbitsatellites
    MENG Bo, XU Sheng, HUANG Jian-Bin, LI Zhi, PANG Yu-Jia, HAN Xu
    2016, 36 (6):  14-21.  doi: 10.16708/j.cnki.1000-758X.2016.0067
    Abstract ( 526 )   PDF (1873KB) ( 514 )   Save
    Prolonglifespanofgeosynchronousorbit(GEO)satellitesbyrefuelingsatellitesonorbithaseconomicvalue.Asaresult,itisveryimportanttoassesstheon-orbitservicing(OOS)paradigmandoptimizeitsutilities.TheassessmentofOOSsystemforrefuelinggeosynchronoussatellitesandoptimizationmethodsofitsdeploymentstrategywerestudied.AnewarchitectureofOOSsystemwasproposed,whichincludedafuelstoragestationandNrefuelingspacecraft(1+N).Thefuelstoragestationcarriedagreatdealoffuel,runningonorbitsteadily.TherefuelingspacecraftmaneuveredongeosynchronousorbitandimplementedtherefuelingmissionforGEOsatellites,whenthespacecraftransoutoffuel,itcametothestationandacquiredfuel.Theweightandorbitoffuelstoragestation,thenumber,weightandorbitofrefuelingspacecraftwerethekeyproblemsofdeploymentstrategy.ThemathematicmodelofoptimizationofthedeploymentstrategywhichshortentheresponsetimeofrefuelingGEOsatellitesandlowerthepriceofservicingsystemasmulti-objectiveswasconstructed.Thecalculationprocessoftheoptimizationwasanalyzed.Byanalyzingtheoptimizationresults,theoptimaldeploymentstrategyofservicingsystemcontainingafuelstoragestationand4-6refuelingspacecraftusedforrefuelingGEOsatelliteswasproposed.
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    ResearchonspacebornevideoSARsystemdesignandimageformationalgorithm
    LIANG Jian, ZHANG Run-Ning, BAO Min-Feng
    2016, 36 (6):  22-28.  doi: 10.16708/j.cnki.1000-758X.2016.0068
    Abstract ( 592 )   PDF (1707KB) ( 710 )   Save
    Asanewmicrowaveremotesensingmode,avideoSARcanprovideacontinuoussurveillanceoveraregionofinterest.ResearchesaboutspacebornevideoSARwerelimited.MostofcurrentresearchesaboutvideoSARonlyfocusonaircraftplatform.AspacebornevideoSARsystemwasdevelopedwiththetransmitterongeostationarysatellitesandthereceiveronthelowearthorbit(LEO)satellites.Therelationshipbetweentheimagingperformanceandthemainsystemparametershasbeenstudied.Thenanimageformationalgorithmwaspresented,whichcouldsatisfytheimagingqualityofvideoSARinhighsquintmodeandavoidunnecessaryduplicationofprocessing.TheDopplersmearandoffsetofthemovingtargetswerereflectedbytheprocessedimages.Meanwhile,thestationarytargetscanbefinelyfocusedon.
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    Amissionplanningmethodfordeepspaceexplorerconsideringdynamicuncertainties
    WANG Xiao-Hui, LI Shuang
    2016, 36 (6):  29-37.  doi: 10.16708/j.cnki.1000-758X.2016.0069
    Abstract ( 459 )   PDF (7126KB) ( 261 )   Save
    Anewmissionplanningalgorithmwasproposedtodealwiththeproblemsoflowidentifiabilityofdynamicuncertaintiesandsinglenessofresponsestrategyintraditionalmissionplanningalgorithmsfordeepspaceexplorer.Firstly,thelevelofdisturbancegeneratedbydynamicuncertaintieswasdividedintofourlevels.Fuzzyneuralnetworkwasusedtoevaluatethelevelofuncertainties,anditcanhelptochoosetheappropriateresponsestrategy.Secondly,alocalmissionrepairplanningmethodbasedonhierarchicaltasknetwork(HTN)wasproposedtoredecomposetheinvalidcomplexmissionscausedbythedisturbanceofuncertaintieswhentheresponsestrategywasrepairplanningstrategy.Finally,computersimulationresultsshowthattheproposedalgorithmcaneffectivelyevaluateandrespondtodeepspacedynamicuncertainfactors,andthereforeimprovethereliabilityandflexibilityofthemissionplanningalgorithm.
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    Segmentationofhigh-resolutionmulti-spectralremotesensingimagebasedonmulti-feature
    JIN Yong-Tao, LI Xu-Qing, ZHANG Zhou-Wei, CHEN Xi
    2016, 36 (6):  38-46.  doi: 10.16708/j.cnki.1000-758X.2016.0070
    Abstract ( 597 )   PDF (22180KB) ( 239 )   Save
    Aimingattheproblemthatthetraditionalimagesegmentationalgorithmscannotbeappliedtohighresolutionremotesensingimageswithmanyfeatures(spectral,textureandgeometricfeatures),aremotesensingimagesegmentationmethodbasedonmulti-featurewasproposed.Thealgorithmintegratedtheimprovedmeanshiftfilteringandautomaticmarkerwatershedtoachievethesegmentationperformance.Firstly,anautomaticmarkerwatershedmethodwasusedtosegmenttheremotesensingimageforextractinggeometricfeatureusingaffinemomentinvariantsofshapeoperator.Secondly,agraylevelco-occurrencematrixofthefirstprincipalcomponentwascalculatedastexturalfeature.Thirdly,multi-featurefilteringresultswereobtainedbyusingimprovedmeanshiftalgorithmincludingspectralfeature.Finally,thefilteringresultswereperformedusingtheautomaticmarkerwatershedsegmentationmethod.Inordertoshowtheeffectoftheproposedmethod,anunsupervisedevaluationandcomparisonoftheimagesegmentationfromtheproposedalgorithmandsinglewatershedsegmentationwereimplementedusingmulti-spectralinformationentropy.Theexperimentalsegmentationresultsshowthattheproposedalgorithmcanreducetheover-segmentationphenomenonefficientlyanditissuitedforthesegmentationofhigh-resolutionmulti-spectralremotesensingimage.
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    Anadaptedgeneticalgorithmappliedtosatelliteautonomoustaskscheduling
    ZHAO Ping, CHEN Zhi-Ming
    2016, 36 (6):  47-54.  doi: 10.16708/j.cnki.1000-758X.2016.0064
    Abstract ( 518 )   PDF (1782KB) ( 548 )   Save
    Aimingatsolvingtheproblemofautonomoustaskschedulingofearthobservingsatelliteswiththeabilityofswinging,satelliteautonomoustaskschedulingproblemandconstraintsweredescribed.Asingle-objectivemulti-constraintsmodelwasbuiltaccordingtotheNP-hardcharacterofsatelliteautonomoustaskschedulingproblem.Anadaptedgeneticalgorithmwasdesigned.Allofthegeneticoperationsofgeneticalgorithmswereoptimized.Firstly,mini-regionmethodwasappliedtogenerateoftheoriginalpopulationtoensurethediversityofpopulation.Adaptiveprobabilitieswereusedforcrossoverandmutationoperation.Twogenerationscompetitivetechnologywasusedtoavoidtheprematureandimprovetheefficiencyandtherobustnessofthealgorithm.Thealgorithmalsousestheoptimizationreservedstrategytopreservetheoptimalsolution,whichmakesthealgorithmconvergetotheglobal.Theadaptedgeneticalgorithmwasappliedtothelocalmulti-conflicttasksobservationanddesignedsimulationexperimentsoftheobservationofregionaldensetargets.Theresultsarecomparedwithresultsofsimulatedannealingalgorithmandimmuneantcolonygeneticalgorithm,anditshowsthattheproposedalgorithmismoreeffectiveandithasabetterconvergence.
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    Rapidthermaldeformationanalysisofon-orbitsatellitesonthebasisofstatisticmethod
    ZHANG Ye-Chi, ZHANG Long, LUO Wen-Bo, PAN Teng
    2016, 36 (6):  55-61.  doi: 10.16708/j.cnki.1000-758X.2016.0062
    Abstract ( 520 )   PDF (6812KB) ( 464 )   Save
    Tocalibratetheorientationpositionofthesatelliteorbitbythetemperaturesensors,theordinaryKrigingmethodwidelyusedingeo-statisticswasappliedintothetemperatureestimationprocessofthesatellite.Arapidthermaldeformationanalysismethodwasdevelopedbasedonthestatisticmethods.Basedonasmallamountoftemperaturesensors,estimationofthetemperaturefieldwascarriedout.Then,thetemperaturefieldwasusedforthefiniteelementanalysistoaccomplishthethermaldeformationanalysis.Differencesbetweentheanalyticalandtheexperimentalresultsofthedeformationofthepayloadarearound1′,whichconfirmsthatthemethodcanbeusedtoobtainthevariationofopticalaxisofthepayload.Furthermore,comparedtothethermophysicalmethod,theworkperiodcanbereducedbyseveraldays.Thisworkprovidesguidanceforrapidthermaldeformationanalysisofon-orbitsatellites.
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    Apre-emptiblereal-timeSpaceWireon-boardnetwork
    WU Zhong-Jie, LIU Jiang-Lan, SONG Wei, YU Jun-Jie, LIN Jing-Ming, ZHAO Zhan-Feng
    2016, 36 (6):  62-69.  doi: 10.16708/j.cnki.1000-758X.2016.0063
    Abstract ( 597 )   PDF (2921KB) ( 620 )   Save
    Tobuildunifiedon-boardcommunicationinfrastructurebasedonSpaceWrie,researchshouldbedonetoguaranteethedeterministicandreal-timeperformanceofmessagetransmission.Toovercomethelackofflexibilityintraditionaltime-triggeredcommunication,amodifiedtime-triggeredSpaceWirenetworkwhichsupportedthebroadcastingofcommunicationtasktransmissionidentifierwasproposed.Onthisbasis,anon-destructivepre-emptiblecommunicationmechanismwasbuiltandtheapplicationofclassicalprocessorreal-timeschedulingalgorithmtocommunicationtaskschedulingwasdiscussed.Atlast,thetransmissiondelayperformancewasanalyzedandcomparedamongevent-triggered,traditionaltime-triggeredandnon-blockingreal-timeSpaceWirecommunicationmechanisms.Theresearchshowsthatthiscommunicationmechanismcanreducetheworst-caseend-to-enddelay,andissuitedfortheschedulingofcommunicationtaskswithvariouspriorities.
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    Multi-satelliteseparationsimulationbasedonvirtualprototype
    WANG Jin-Chang, YAN Bo, ZHANG Jia, LI Cheng-Xiang, ZHANG Yao-Lei
    2016, 36 (6):  70-76.  doi: 10.16708/j.cnki.1000-758X.2016.0065
    Abstract ( 523 )   PDF (6244KB) ( 452 )   Save
    Inmulti-satellitelaunchmission,thesatelliteseparationsimulationisrelativelycomplicated.Themotionstateisinfluencedbymultiplefactors,includingseparationspringforce,explosiveboltimpact,electricalconnectortension,spacecraftmass-property,initialmotionalparametersandsoon.Itisdifficulttosolvebyusingthetraditionalnumericalcalculationmethod.Virtualprototypingtechnologyisaneffectivewaytosolvetheproblemsabove.Thesatelliteseparationanalysiswascompletedbyvirtualprototypetechnology,throughsettingdeviationandinterference,simulatedthesatellitesseparationprocessunderthedeviationandfaultmode,evaluatedthepossibilityofcollisionandotherdangerousoccurrence.Theresultsshowthattheimpactontheseparationresultsfromsystemdeviationcanbeevaluatedbysimulation,springselectionisneededinthecaseofhighrisk.Secondary,theinterferencecausedbyelectricalconnectorsgenerallydoesnotaffecttheseparationsafetyduetotheshortactiontime.
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    Realtimeschedulingbasedontimetriggered1553Bbus
    ZHAN Pan-Pan, GUO Jian, LIU Xin
    2016, 36 (6):  77-82.  doi: 10.16708/j.cnki.1000-758X.2016.0071
    Abstract ( 582 )   PDF (2184KB) ( 542 )   Save
    Inordertooptimizetheperformanceof1553Bbustransmission,reducethewaitingtimeafterthemessagestransmission,andimprovethebusbandwidthutilizationandtherealtimeperformanceofemergencymessagesresponse,the1553Bbusschedulingmethodswerestudied,andarealtimeschedulingmethodbasedonthetimetriggered1553Bbuswasdesignedbyusingthemethodofperiodicschedulingandpreemptivescheduling.Onthebasisoftimetrigger,busmessageswerecentrallyscheduledbypriority.Duringthetimethebusframewastransmittedonthebus,theprocessorcouldcontinueprocessingothertaskswithoutwaitingforsometime.Basedonthecharacteristicofbusdataareapartition,thepreemptiveschedulingstrategyforemergencymessagestointerruptcommonmessagestransmissionwasdesigned.Nonimportantdatadidn′ttakeupthebuschannelforalongtime,sothatemergencymessageswerequicklyresponded.Theexperimentalresultsshowthattheproposedmethodcanachievethemaximumcapacityofbustransmission.Itcanimprovethetransmissionefficiencyandbandwidthutilizationof1553Bbus,whiletheresponsetimeofemergencymessagesisstablewithin2ms.
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