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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 ( 1032 )   PDF (2250KB) ( 1979 )   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. Related Articles | Metrics

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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 ( 792 )   PDF (1873KB) ( 675 )   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. Related Articles | Metrics

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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 ( 954 )   PDF (1707KB) ( 1053 )   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. Related Articles | Metrics

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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 ( 784 )   PDF (7126KB) ( 373 )   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. Related Articles | Metrics

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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 ( 892 )   PDF (22180KB) ( 295 )   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. Related Articles | Metrics

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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 ( 848 )   PDF (1782KB) ( 976 )   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. Related Articles | Metrics

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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 ( 722 )   PDF (6812KB) ( 1307 )   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. Related Articles | Metrics

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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 ( 753 )   PDF (2921KB) ( 803 )   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. Related Articles | Metrics

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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 ( 782 )   PDF (6244KB) ( 714 )   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. Related Articles | Metrics

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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 ( 769 )   PDF (2184KB) ( 839 )   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. Related Articles | Metrics