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中国空间科学技术
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25 December 2015, Volume 35 Issue 6
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ApproachPlanningandControlMethodforRendezvouswithNoncooperativeTargetinanEllipticalOrbit
XU Li-Jia, HU Yong
2015, 35 (
6
): 1. doi:
10.3780/j.issn.1000-758X.2015.06.001
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786
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Theproblemsofapproachplanningandcontrolmethodforrendezvouswithanuncontrolledtumblingnoncooperativetargetinanellipticalorbitwerestudied.Onthepartofapproachplanning,thechaserandtargetspacecraftrendezvousedfromadistancetoasafeberthpoint,whichwasdesignedbyconsideringthestructureofthetargetspacecraft.Aftertheobservationattheberthpointforaperiodoftime,thegrasppointwasdeterminedandtheattitudemotionofthetargetspacecraftcanbepredicted.Then,asafeapproachtrajectoryfromtheberthpointtotheimplementpointforgraspingwasdesignedfortracking.Onthepartofcontrolmethod,byusingthemeasurementsoftherelativepositionandconsideringtheuncertaintiesoftheactualsystem,adaptivecontrollawsbasedonthecharacteristicmodelwereproposedforthewholerendezvousandapproachprocess.Finally,anexamplewasgiventoshowtheeffectivenessoftheproposedapproachplanningandcontrolmethod.
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DesignandPerformanceAnalysisofSelfadaptionTemperatureControlColdPlate
ZHANG Hong-Sheng, LI Yun-Ze, WANG Sheng-Nan, NING Xian-Wen
2015, 35 (
6
): 12. doi:
10.3780/j.issn.1000-758X.2015.06.002
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771
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Toimprovethetemperaturecontrolreliabilityofspacecraftthermalcontrolsystem,aselfadaptiontemperaturecontrolcoldplatewasdesignedbasedonthevolumechangecharacteristicsoftheparaffinwaxduetothephasechangeasitstemperaturechanged.Thedesignmodeloftheselfadaptiontemperaturecontrolcoldplatewasbuilt,andthethermalnetmodelofthesinglephasefluidloopwiththecoolplatewasgiven.Theperformanceofthecoldplateandthesinglephasefluidloopwasanalyzed.Resultsshowthatthecoldplatedesignedhastheabilityofselfadaptiontemperaturecontrol,anditmaybewidelyusedinthetemperaturecontrolfortheelectronicdevicesatgroundandheatloadsonspacecraft.
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AdaptiveControlforStabilizingtheCouplingSystemwithDisturbanceafterCapturingSpacecraft
WANG Yi-Ping, ZHAO Yu-Shan, SHI Peng, ZHENG Han-Qing
2015, 35 (
6
): 20. doi:
10.3780/j.issn.1000-758X.2015.06.003
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943
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Anadaptivecontrolbasedondynamicsmodelforstabilizingthecouplingsystemwasproposed,forthecouplingsystemmaybeunstableduetothechangeinmasscharacteristicsandmomentumofthecouplingsystem.Thedynamicsofsystemwasmodelledandthevelocitiesofcouplingsystemwerederivedfromtheimpactmodel.Basedonthedynamicmodeldeveloped,thelinearfeedbackcontrollerwasdesigned.Becauseoftheuncertaintyonthedynamicparametersanddisturbance,thedynamicmodelwaslinearlyparametricwithrespecttoagroupofunknowndynamicparametersandunknowndisturbance.Then,theadaptivelinearfeedbackcontrollerwasdesigned.UsingathreeDOFplanarspacemanipulator,thenumericalsimulationwascarriedout.Thesimulationresultsconfirmthecontrollerisfeasibleandeffective.
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ResearchonMinimumFuelControlofRelativeEllipsePhaseinInPlaneCompanionFlying
WU Hui-Ying, ZHOU Mei-Jiang, QI Jin-Ling
2015, 35 (
6
): 29. doi:
10.3780/j.issn.1000-758X.2015.06.004
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811
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Itisessentialtosavefuelinorbitcontrolformicro/nanocompanionsatelliteduetothelackofresources.TheminimumfuelcontrolstrategyoftherelativeellipsephaseininplanecompanionflyingwasstudiedbasedontheHillequationandtheextremevaluetheoryofdualfunction. Whenthephaseneededtochangeisacuteangle , andthevelocityincrementislessthantheresultthatmultiplieshalfoforbit′smeanangularbytherelativeellipsesemiminoraxis(ΔV<05nb),thetheoreticalanalysisresultsshowthatthemostefficientcontrolmethodoftherelativeellipsephaseisimpulsivecontrolparalleltothelateraldirection, thevelocityincrementistheresultthatmultiplieshalfoforbit′smeanangular,therelativeellipsesemiminoraxisbytheabsoluteofphase′scosine(ΔV=05nb|cosΘ|,andthephasewillbetheleft(thephaseisπ/2)orright(thephaseis-π/2)pointofrelativeellipseaftercontrol.Therelativeellipsesemiminoraxiscanbereducedatthesametime. Whenthephaseneededtochangeisnotacuteangle, itisneededtobedividedintoseveralacuteanglesforsavingfuel. Furthermore,theorbitcontrolstrategyofacompanyingsatellite′sphasecontrolwasgainedbyapplyingthetheory.
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PredictiononPerformanceDegradationofThermalControlCoatingBasedonSatelliteTemperatureonOrbit
SONG Xin, ZHANG You-Wei, LIU Zi-Jun, SI Dong-Bo
2015, 35 (
6
): 40. doi:
10.3780/j.issn.1000-758X.2015.06.005
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938
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Amethodwasproposedtopredicttheperformancedegradationofthermalcontrolcoatingbasedontemperaturedataonorbit.Amathematicalmodelwhichwasconstructedtostudythe degradationofthermalcontrolcoatingperformancespanningintegeryears wasverifiedbynumericalsimulations.Thecalculationdatameetthetruevaluewell,indicatingthatthemathematicalmodelisvalid.
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CharacteristicsAnalysisofaOnewayMicroExpansionTypeHeatSwitchforSpaceApplication
MA Ming-Chao, GUO Liang, ZHANG Xu-Sheng, WU Qing-Wen
2015, 35 (
6
): 48. doi:
10.3780/j.issn.1000-758X.2015.06.006
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895
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Inordertoimprovethetemperaturecontrolprecisionofthedetectorandother spacecraftandreducethetemperaturefluctuationaccuracy,aonewaymicroexpansiontypeheatswitchwasdesignedbasedonthermalexpansionandcontractionofmetal.Thecharacterizationparameterwasgettoanalysisthetwodimensionalsteadystatethermalmodeling. Then, anexperimental setupwasdesignedtosimulatetheactualworkingconditionsofthermalswitch,andswitchoperatingstatusandrelatedperformanceparametersweremeasuredunderdifferentheatpower.Whenthepowerisupto04W,disconnectedresistanceis23046K/W.Thepowerisupto30W,theclosedthermalresistanceofswitchis03022K/W,andswitchratiois7626.Theresultsshowntheexperimentdataareingoodagreementwiththetheoreticalcalculations.
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DetectingandTrackingMethodforSpaceTargetGraspingBasedonContourFeaturesDetection
KANG Ru-Fei, WANG Shi-Cheng, LIU Zhi-Guo, YANG Dong-Fang
2015, 35 (
6
): 57. doi:
10.3780/j.issn.1000-758X.2015.06.007
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1012
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Duetothecomplexbackground,changesoftheilluminationandrelativemotions,betterperformancesineffectivenessandrobustnessareneededformovingtargetgraspingtasks.Anewdetectingandtrackingmethodbasedondynamiccontourfeatureswasproposed.Thegraygradientmethodandtheactivecontourmodelwereintegratedinthismethod.Atfirst,onthebasisofthetraditionalgraygradientmethod,animprovedgraygradientmethodwasproposed,whichincludedshapematching,areascreeningandadaptiveadjustmentofgraythreshold.Accordingtothedetectingresultsoftargetcontour,thetimedomainconstraintsbetweenimagesequenceswerealsoinvolved.ThedetectingresultswereaddedintheGVFsnakemethodtoimprovethemeasuringaccuracyandeffectiveness.Intheend,consideringtherealtimedemandofthegraspingtasks,thetrackingmethodswasparallelwithCUDAcalculationarchitectureandanexperimentwasconductedwithabundleofsequentialimages.Theresultshowsthatthetrackingratecanreach10framespersecond,improvingthetrackingspeedwithoutsacrificingtheaccuracy.
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LunarSurfaceSamplingDeviceCollisionAvoidancePlanningBasedonArtificialPotentialFieldMethod
ZHENG Yan-Hong, DENG Xiang-Jin, PENG Jing, YAO Meng, ZHAO Zhi-Hui
2015, 35 (
6
): 66. doi:
10.3780/j.issn.1000-758X.2015.06.008
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808
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Thesurfacesamplingtechnologyisanimportantmethodforgettingsoilsample.Itisakeytechnologyforcollisionavoidancetrajectoryplanningwithcomplexlunarterrain,uncertainlandingattitudeandirregularlunarprobeenvelope.Accordingtothedesignoffourdegreeoffreedomsurfacesamplingdevice,kinematicsandinversekinematicswereanalyzed.Consideringtheconstraintsofdynamicandstaticobjectpoints,therestrictionspacewasdividedintoavailablecollisiondetectabilityareaandunreachableset.Toexpeditetheplanningspeed,thedynamicavailablecollisiondetectabilityareaandunreachablesetwereintroducedtotheartificialpotentialfieldmethod.Andthecollisionavoidanceplanningalgorithmwasproposed.Thesimulationresultprovesthatalgorithmiseffectiveforsurfacesamplingtrajectoryplanning,anditcanbeusedtosupportsurfacesamplingdesign.
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AnOnlineIndividualChannelInterrelationMethodStudyofAntennaArrayCalibration
LIU Han-Chao, LIANG Hao
2015, 35 (
6
): 75. doi:
10.3780/j.issn.1000-758X.2015.06.009
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828
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Duetotheclockfrequencydifferencebetweenthetransmitterandthereceiver, itisdifficultforthemultiantennasatellitemobilecommunicationchannelcalibrationinlowsignalnoiseratiol(SNR). Anonlineindividualchannelmulticycleinteraccumulationmethodwasproposed, whichcouldsolvethedifficultyofchannelcalibrationinlowSNR.Thiscalibrationspreadspectrumsignalwasproducedfromgroundcalibrationstation, whichcouldreducethecomplexityofsatellitedesignandrealizeonlinecalibrationwithoutinterruptingthecommunicationforusers. Thismethodsolvestheproblemofcodeoffsetandfrequencyoffsetthroughmarkingthevaliddata, matchingrate,andsoon. TheresultsshowthattheSNRis-30dBunderthespreadingradioof1023,whichis 03dBworsethanthatofthetheorySNR. Thestudycanprovidetechnicalsupportforthemultiantennasatellitemobilecommunication.
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OptimalEntryTrajectoryDesignofWingedMarsProbe
LIU Tao, NAN Ying , HU Hai-Long
2015, 35 (
6
): 82. doi:
10.3780/j.issn.1000-758X.2015.06.010
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794
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ThispaperprovidesanoptimalentrytrajectoryofthewingedMarsprobe,rightafteritchangedtheorbitintotheMartianatmospherebrakedbyreversethrustengine.ThispaperestablishesMartianatmospheremodelandgravitationalfieldmodelcorrespondingonthedensityoftheMartianatmosphereandgravitationalfieldparameters,anddeterminedthedynamicequationsoftheMarsprobe.Withinalltheconstraintconditionsintheenteringprocess,thispaperdesignsanoptimalentrytrajectorybasedonthegeneticalgorithm.Inaddition,thispaperprovidesdifferentthrustengineschemethroughcomparingthem.Theresultsshowthatthesecondschemecanachievetheoptimalperformanceindexandthelandingspeedis136m/s,ultimatelyrealizingtheminimumconsumptionofenergyandaerodynamicheatemissionstructurequalityintheprocessofenteringandsoftlanding.
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