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    25 June 2017, Volume 37 Issue 3 Previous Issue    Next Issue
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    XPNAV-1Satellitetimingdataanalysisandpulseprofilerecovery
    HUANG Liang-Wei, SHUAI Ping, ZHANG Xin-Yuan, CHEN Shao-Long, XU Li-Hong, YANG Zhe, DENG Lou-Lou, CHEN Jian-Wu, SHI Yong-Qiang, XUE Li-Jun, DING Qiang-Qiang, WU Yao-Jun, BEI Xiao-Min, MENG Jing, LIN Qing-Qing, CHEN Qiang, ZHANG Qian, ZHANG Heng-Bin
    2017, 37 (2):  1-10.  doi: 10.16708/j.cnki.1000-758X.2017.0051
    Abstract ( 1208 )   PDF (6856KB) ( 2014 )   Save
    XPNAV-1isthefirstsatelliteofChinadesignedfortheon-orbitdemonstrationoftheX-raypulsarnavigationtechnology.TheX-raytimingdataanalysismethodwasdiscussed,andthepulseprofileusingtheobservationdatawasrecoveredtoverifythecapabilityofobservingpulsarsinspace.ThescientificmissionoverviewofXPNAV-1wasdescribed.Thephotontimingdataprocessingstepsweredesigned,andtheX-raytimingdelaymodelwasconstructed.Basedontheproposedmodel,theobservedphotonarrivaltimesoftheCrabpulsarwerecorrectedtotheinertialreferencepoint,andthenthepulseprofilewasrecoveredthroughtheepochfoldingtechnology.TherecoveredprofileshowsthatthetwopeakstructurestandsfortheCrab′sradiationshape,provingthatCrabissuccessfullyobservedbytheX-raydetectorofChina.
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    MicrowavepowertransmissiondemonstrationsystemdesignforSpaceSolarPowerStation
    DONG Ya-Zhou, DONG Shi-Wei, WANG Ying, FU Wen-Li, LI Xiao-Jun, GAO Shi-Chang, WEI Gao
    2017, 37 (2):  11-18.  doi: 10.16708/j.cnki.1000-758X.2017.0026
    Abstract ( 1007 )   PDF (9876KB) ( 1130 )   Save
    Microwavepowertransmission(MPT)isoneofthekeytechnologiesinSpaceSolarPowerStation(SSPS).Thestate-of-the-artresearchesandvalidationsonlyfocusonindividualtechnologybutlackofcomprehensiveoptimizationforSSPSsystem.AccordingtotheoperatingmodeofSSPS,ademonstrationsystemwasproposedtovalidatemicrowavepowertransmissioninSSPS.ThetransmittingantennaarrayandrectennaarrayweredesignedbyusingintegratedprocessingwithapproximateGaussianfielddistributionintransmittingantennaarrayandlowreflectiondesigninrectennaarray.Thebeamcontrolmethodinthesystemwasbasedondirectionofarrivalestimationbysendingpilotsignalandbeamsynthesisbycontrollingthephaseshiftersinthetransmittingantennaarray.Theanalyzedbeamcollectingefficiencyofdemonstrationsystemis94.2%,about17.6%higherthanthetraditionaluniformdistributionsystem.ThedemonstrationsystemcomprehensivelysimulatestheMPTofSSPSinseveralways,includingsystemscaleminification,transmittingantennafielddistribution,etc,powerdensityandbeamcontrollinganditcanbethepromotionofSSPSdevelopment.
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    Designandtestofmicrowavepowertransmissionsystem
    WANG Ying, WEI Gao, DONG Ya-Zhou, DONG Shi-Wei, FU Wen-Li, LI Xiao-Jun, RAN Li-Xin
    2017, 37 (2):  19-27.  doi: 10.16708/j.cnki.1000-758X.2017.0028
    Abstract ( 1019 )   PDF (3577KB) ( 2266 )   Save
    MicrowavepowertransmissionservedasthecoretechnologyoftheSpaceSolarPowerSatellite(SSPS)wasstudied.Therectifyingsurfacewasresearchedbasedontheconceptofperfectlymatchedlayertosolvetheproblemthatbeamcollectionefficiencywoulddeclinewithdistanceawayfromtransmittingantennabecauseofthespreadofbeam,bychangingperfectlymatchedlayerstructureconjugatematchbetweenantennaoutputimpedanceandrectifiercircuitinputimpedance.Therectifyingsurfaceexhibitsastrongrestraintohighorderharmonics,withouttheneedofRFfilterwhichisanimportantelementforthetraditionalrectenna,sothecircuitstructureissimpleandhighconversionefficiencyenergycanberealized.Andundertheproposedlimitforthecenter-of-beampowerdensitytoassureenvironmentalhealthandsafetyformicrowavetransmission,anexperimentalsystemwithsolidpoweramplifierat5.8GHzwasconstructedandtested,andthemaximumconversionefficiencyis57.7%.TheexperimentresultsshowthatthedesignedmicrowavepowertransmissionsystemisbenefitforgrounddemonstrationtestinginminiatureversionandbuildingofSSPSinfuture.
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    Effectofspacechargeonsurface-breakdownbehaviorofpolytetrafluoroethylene
    WANG Fei-Peng, ZHANG Tao, WEN Gang, FAN Fan, LI Jian, CUI Wan-Zhao
    2017, 37 (2):  28-34.  doi: 10.16708/j.cnki.1000-758X.2017.0001
    Abstract ( 995 )   PDF (4305KB) ( 1910 )   Save
    Owingtothelowconductivity,polytetrafluoroethylene(PTFE)tendstoaccumulatesurface-chargewhichiscausedbyvariousfactors,eg.friction,spacechargecarriers,cosmicrays,etc.Additionally,thedecayofsurface-chargetakeslongtime.Itiscertainlysignificativetoinvestigatetheroleofsurfacechargeoninfluencingthesurface-breakdownbehavior.ThisworkendowsPTFEsamplefilmswithvariablesurface-chargedensitybyneedle-platecorona-chargingelectrodes.NegativeDCsurfacebreakdownvoltagewasthenmeasuredonallsamplesatatmosphericpressureandinvacuum.Experimentalresultsshowthatthesurfacechargedensityistailorablebyneedlevoltages;however,thenegativecoronaaccumulatessurfacechargefasterthanthepositivecorona.ThepositivesurfacechargebenefitstoreducenegativeDCsurfacebreakdownvoltage,whilenegativesurfacechargeslightlyleadstoanoppositeway,ie.enhancingthesurfacebreakdownvoltageforacertainextent.Additionally,theinfluenceofspacechargeonthebreakdownvoltageinvacuumisweakerthanthatatatmosphericpressure.
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    Missionschedulingformultiplespacecraftrefuelingbasedonspacefuelstationincircularorbits
    ZHU Xiao-Yu, QIAO Bing, ZHANG Qing-Zhan, JIN Yong-Qiang, TAN Ying-Long
    2017, 37 (2):  35-43.  doi: 10.16708/j.cnki.1000-758X.2017.0067
    Abstract ( 1081 )   PDF (7814KB) ( 926 )   Save
    Asthedevelopmentofspacetechnology,thedemandforspacetransportationsystembecomeslargerandmorevarious,on-orbitrefuelinghasbeenanewandindependentdevelopingdirectioninordertoreducethelaunchcosts,mitigatespacedebrisandimprovethepayloadoflaunchvehicle.Thedevelopmentofmethodologieswasfocusedtogenerateoptimaltrajectoriesandschedulesforrefuelingconstellationsofrefuelingspacecraft.Anon-orbitreusablerefuelingpolicyanditsmissionschedulingformultiplespacecraftincircularthroughaspacefuelstationwerepresented.Inordertoestablishtheschedulingmodelfortheon-orbitrefuelingofmultiplecircularspacecraftorbitthroughaspacefuelstation,therelationshipbetweenthevelocitychangeandorbitalelementsfortransferringofservicespacecraftwasfirstlyobtainedbasedontheanalysisoftheproblemoftwoimpulsesorbitalmaneuver.Amulti-objectiveoptimizationmodelformissionschedulingofon-orbitrefuelingformultiplespacecraftincircularorbitswasdevelopedtooptimizeboththesequenceandtimedistributionoftherefuelingmission,andaspecificaldesignalgorithmwasemployedtosearchthesolutionstothemulti-objectiveoptimizationproblem.Toverifytheeffectivenessoftheproposedschedulingalgorithm,acomputersimulationthataimsatschedulingamissionofon-orbitrefuelingfor30spacecraftincircularorbitswasconducted.
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    CorrectionfortransientthermalanalysismodelofCarbonDioxidedetector
    Li-Qiang, CHEN Li-Heng
    2017, 37 (2):  44-52.  doi: 10.16708/j.cnki.1000-758X.2017.0004
    Abstract ( 1031 )   PDF (7908KB) ( 837 )   Save
    InordertoaccuratelypredicttheonorbittemperatureoftheTan-Satloading,theresearchfortransientthermalanalysismodelcorrectionundertestconditionswaspresented.Comparedtheresultsbetweenthermalanalysiscalculationandthermalbalancetest,temperaturedifferencesofthetemperaturemonitorswereconfirmed.ParametricsensitivityanalysisofcarbondioxidedetectorthermalanalysismodelwascompletedbytheMonteCarlomethod,andmodelparametersweredividedintoglobalsensitive,localsensitiveandinsensitiveparameters.Accordingtothedataofthermalbalancedtest,theLatinhypercubesamplingandsimplexmixedmethodswereappliedtocorrectmodelparametersbytheclassificationlayerbylayer,andtheoptimalvalueswerecalculated.Thesevaluesweretakenintothethermalanalysismodeltoverifytheaccuracyofthecorrectionmethodandanalyzetheresidualerror.Correctionresultsshowthatthecorrectedtemperaturedifferenceδaislessthan±0.5℃forallthetemperaturemonitors,theresidualerrorcorrectionratesθaregreaterthan80%,whilemosttemperaturedifferencesreduceanorderofmagnitudeaftercorrection.Theseresultsillustratethecorrectioniseffectiveandthemethodisreasonableandfeasible.
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    Designofadaptiveretransmittedfiledeliveryprotocolinspacecommunication
    WANG Yang, YANG Hong, CHEN Xiao-Guang, CHEN Song
    2017, 37 (2):  53-61.  doi: 10.16708/j.cnki.1000-758X.2017.0042
    Abstract ( 1470 )   PDF (8672KB) ( 927 )   Save
    CCSDSfiledeliveryprotocol(CFDP)wasimprovedbydoubleretransmissionmechanismorsettingtheretransmittedtimesinviewofbiterrorrate(BER).However,withoutconsideringtheimpactofthenumberofprotocoldataunits(PDUs),packeterrorrate(PER)andtheratiooflinkpropagationdelaytoPDUtransmissiondelay,theseschemesarenotthemostappropriateinspecificspacemissionsunderdifferentchannelconditions.  BasedonCFDP,anewfiledeliveryprotocoladjustingtheretransmittedtimesoflostPDUsadaptively(AR-FDP)wasproposedinspacecommunication.ThetheoreticalmodelsoffiledeliverytimeandextratransmissioneffortofAR-FDPwereestablished.Also,theeffectsofretransmittedtimesonthenumberofretransmissionroundsandthenumberofretransmittedpacketswereanalyzedandtheschemeoftheadaptivecontrolmodulewaspresented.ThetheoreticalanalysisandsimulationresultsindicatethattheAR-FDPshortensthefiledeliverytimeby55.69%and74.28%comparedtothedoubleretransmissionschemeandCFDPrespectivelyinMars-to-EarthcommunicationwithPDUnumberof1kandPERof0.79.InMoon-to-Earthcommunication,theAR-FDPshortensthefiledeliverytimeby28.05%comparedtotheschemeadjustingtheretransmittedtimesinviewofBERwithPDUnumberof100kandPERof0.79.
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    Studyonaerospaceembeddedsoftwaredataracebenchmark
    CHEN Rui, YANG Meng-Fei
    2017, 37 (2):  62-70.  doi: 10.16708/j.cnki.1000-758X.2017.0052
    Abstract ( 1143 )   PDF (1631KB) ( 856 )   Save
    Nogoodbenchmarksuitewasmadetoevaluatethedetectionmethodsortoolsfortheadventofinterruptdatarace.Basedontherealaerospaceembeddedsoftwaredataracebugs,sixessentialfactorsrelatedtodataracedetectionwereproposed,andthedataracebenchmarksuitenamedRaceBenchforaerospaceembeddedsoftwarewasdesigned.TheRaceBench,whichisclosetorealprogramsandisextensible,coversallsixfactors.TheRaceBenchwasusedtoevaluateadataracedetectiontoolnamedSpaceDRC.TheresultshowsthatRaceBenchcanevaluatethecapabilitiesofthetooleffectively.
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    Researchondeterminingmethodsofobservedstellarinon-boardradiometriccalibration
    ZHANG Wan-Ying, WANG Tao, CHEN Fan-Sheng
    2017, 37 (2):  71-76.  doi: 10.16708/j.cnki.1000-758X.2017.0021
    Abstract ( 1060 )   PDF (1707KB) ( 939 )   Save
    Theon-boardradiantcalibrationmethodsbasedonobservedstellarhasbecomeoneofthemaincalibrationmethodsofinfraredcamerainrecentyears.Thekeyofthemethodistodeterminetheobservedstellarandtheirradianceinthecamera′sdetectionband.Inordertostudytheirradianceindifferentbands,firstofall,themathematicmodelofstellarirradiancewasbuiltasapointsource.ThentheTaylorseriesandgeneticalgorithm(GA)wasusedtocalculatethestellartemperatureTandtheirradianceofstellarbasedondifferentirradianceinseveralbandsofstellarinWISEcatalogwasextrapolated.Asaresult,theproportionofthestellarwhoseextrapolationaccuracy<3%is68.34%,whichsatisfiestheproject′srequirements.Finallythespectrumfeatureofthecalibrationstellarwasananlyzedindifferentaccuracytovalidatethemethods.
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    DesignofsteppermotorcontrolcircuitforsatellitebasedonFPGA
    LIN Fang, WANG Yu, FU Yi-Bin, LU Fan, CHANG Zhen, QIU Xiao-Han
    2017, 37 (2):  77-85.  doi: 10.16708/j.cnki.1000-758X.2017.0022
    Abstract ( 1861 )   PDF (2150KB) ( 1086 )   Save
    Adesignofacircuitcontrollingsteppermotorsinawiderangeofmomentforspecialcharacteristicsoflongin-orbitoperationandthedifficultytoreplaceinspaceequipmentswasproposed.ThisdesignutilizesFPGA,XilinxchipXC3S400-208,asthecorecontrolchipandLMD18200asthedrivingchipofsteppermotors.Onthebasisofadescriptionofthecircuit,theproblemoftheincreaseofresistancemomentandthesolutionsofoutputmomentadjustmentinspaceequipmentsbyPWMcontrolandimpulsefrequencywerediscussed.Testsverifiedthatthedesign′smaximumvalueofoutputmomentinrangemakesmomentmarginreach4andtherangeofadjustingmatchestherequestsofspaceequipments.
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    Simulationanalysisofplatformvibrationonimagequalityofsatellite-basedhigh-resolutionopticalsystem
    FAN Bin, YU Qi-Feng
    2017, 37 (2):  86-92.  doi: 10.16708/j.cnki.1000-758X.2017.0056
    Abstract ( 969 )   PDF (5003KB) ( 1771 )   Save
    Duringtheimagingprogressofspacebasedhigh-resolutioncamera,theimagequalitywillbeaffectedbyinstabilityofsatelliteplatform.Aimedtothisproblem,mechanismofimagequalitydegradationduetoimagemotionwasfirstlyanalyzedandthendifferentsimulationmodelsforstaring,linearscanningandtimedelayandintegrationimagingmodeswerebroughtuptosimulateimagescausedbyimagemotion.Thehigh-resolutionremotesensorwasthentakenasthesimulationexampletoanalyzeimagequalityunderdifferentconditions.TheresultsshowthatmoreimagedegradationisbroughtbyvibrationforTDIimagingmodeandimagequalityismoresensitivetoplatformvibrationwithhigherresolution.Atlast,therelationbetweenspatialresolutionandplatformvibrationparameterswasbuiltandtolerancesofvibrationamplitudeweregivenaccordingtodegradationmodelandimagequalityevaluation,whichcanprovidereferencesforparametersofstabilizationdevices.
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    DamagemechanismofthehighelectronmobilitytransistorinducedbyHPMfromdrainelectrode
    XUE Pei-Wen, FANG Jin-Yong, LI Zhi-Peng, SUN Jing
    2017, 37 (2):  93-100.  doi: 10.16708/j.cnki.1000-758X.2017.0016
    Abstract ( 898 )   PDF (8576KB) ( 1081 )   Save
    Atwo-dimensionalelectro-thermalmodelofthetypicalHEMTwasestablishedbysimulationsoftwareSentaurus-TCAD.Mobilitydegradationinhighelectricfield,Avalanchegenerateeffectandself-heatingeffectwereconsidered,byanalyzingthedistributionsandvariationsoftheelectricfield,thecurrentdensityandthetemperature,adetailedinvestigationofthedamageeffectandmechanismofhighpowermicrowave(HPM)onAlGaAs/GaAspseudomorphichigh-electron-mobilitytransistor(pHEMT)undertheinjectionof14.9GHzequivalentvoltagesignalsfromthedrainelectrodewasperformed.Thesimulationresultssuggestthatintrinsicexcitation,avalanchebreakdown,thermalbreakdownallcontributetodamageprocess,thetemperaturebehavesasperiodic“increasing-decreasing-increasing”oscillationandthewholetrendcontinuouslyincreaseswithtimeanditdecreasesduringpositivehalfcycleandincreasesduringnegativecycle.Thegatecurrentdensityappearsdoublepeakphenomenonbecauseavalanchebreakdownandthermalexcitation.Heataccumulationoccursduringthenegativehalfcycleandbelowthegatenearthedrainsideismostsusceptibletoburnout.Meanwhile,thedrainterminalseriesresistancecanenhancethecapabilityofthedevicetowithstandmicrowavedamageeffectively.
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    GNSSreceivertechniquesbasedonhighearthorbitspacecraft
    GAO Yang, WANG Meng, LIU Lei, CHE Huan, ZHANG Qian
    2017, 37 (2):  101-109.  doi: 10.16708/j.cnki.1000-758X.2017.0015
    Abstract ( 1070 )   PDF (7655KB) ( 1329 )   Save
    ThevisibilityofGlobalNavigationSatelliteSystem(GNSS)appliedinhigh-Earthorbitaltitudesdramaticallyreduces,whilespacesignalpowerlevelisweak,andfastsignalacquisitionandtrackingbecomesverydifficult.ForGNSSreceivertechniquesresearch,GNSSsignalscharacteristicsandavailabilitywereanalyzedinChina′sGEOSJ-17satellite.Antennapatternwasfromtheofficialrelease.Andforhigh-Earthorbitspacecraft′sGNSSweaksignalscharacteristics,GNSSreceiverusedlong-timeintegrationcombfiltermethodtoacquire,tookdifferentialcoherentbitsynchronizationmethodtotrackandusedextendedKalmanfilterorbitdeterminationbasedondynamics.Finally,hardware-in-the-looptestsshowthatGNSSreceiver′sacquisitionsensitivityisbetterthan-173dBW,trackingsensitivityisbetterthan-175dBW,thepositionaccuracyoforbitdeterminationisbetterthan50m,andthevelocityisbetterthan0.01m/s.
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    Analysisoflong-perioddriftcharacteristicsfororbitconfigurationoftheTianqinMission
    WAN Xiao-Bo, ZHANG Xiao-Min, LI Ming
    2017, 37 (2):  110-116.  doi: 10.16708/j.cnki.1000-758X.2017.0044
    Abstract ( 997 )   PDF (4278KB) ( 1265 )   Save
    InordertorealizethelongtermsteadydriftofTianqinMission′sorbitalconfigurationandmeetstabilityindex,initialoptimuminstantaneousorbitalelementsweresearchedbytheoptimizationalgorithm.Firstly,orbitaldynamicsmodelconsideringperturbationwassetup.Secondly,theorbitalconfigurationofequilateraltriangledriftedforlong-periodbytheorbitalelements′varietywasresearchedandtheorbitalelementsleadingtotheorbitalconfigurationofequilateraltriangledriftedinalongperiodweremadeasparameterstobeoptimized.Particleswarmintelligentoptimizationalgorithm(PSO)wasappliedtooptimizeparametersselectedforoptimization.Finally,thesimulationresultsshowthatthearmlengthchangeslessthan1500km,thebreathanglechangeslessthan1.5degreesandthevelocityofthearmlengthvarietychangeslessthan10m/sinnaturaldriftingoffouryearswithoutorbitalmaneuver.Theresultsmeettheinitialindicatorsoftheorbitalconfiguration.
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    Simulationandanalysisofstereogeolocationaccuracyofspacecamerabywhiskbroomimaging
    XIA Zhong-Qiu, HUANG Qiao-Lin, HE Hong-Yan, YANG Yuan-Li, SUN Shi-Jun, YUE Chun-Yu
    2017, 37 (2):  117-125.  doi: 10.16708/j.cnki.1000-758X.2017.0061
    Abstract ( 1056 )   PDF (8097KB) ( 906 )   Save
    Toverifythefeasibilityofthegeolocationofspacecamerabythewhiskbroomimaging,thegeometricmodelofspacecamerabywhiskbroomimagingwasbuiltconcerningthechangeoftheimagescale,thewhiskanglemeasurementaccuracy,thewhiskanglestabilityandthewhiskangularvelocity,takingthefactorsofgeolocationaccuracyintheoveralldesignastheparameters.Thegeolocationaccuracyalgorithmbasedontheerrorpropagationtheorywasderived,thesimulationwascarriedoutandtheimprovingmethodwasputforward.Theresultsshowthatthegeolocationaccuracyofthelargewidthimageryissimilarbetweenthesmallerlinearlengthbythewhiskbroomimagingandthelongerlinearlengthbythepushbroomimaging.Improvingthewhiskanglemeasurementaccuracy,thewhiskanglestabilityandthetimesynchronizationaccuracycanimprovetheplanegeolocationaccuracy.Thesimulationmethodofthegeolocationaccuracyofspacecamerabywhiskbroomimagingisapplicabletotheindexassignmentofthelargewidthimageryoftheremotesensingsatellite.
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    Researchonultra-lowspeedmeasurementforCMGgimbalbasedontracking-differentiator
    SU Nuo, LU Ming, ZHAI Bai-Chen, HU Yue-Wei
    2017, 37 (2):  126-131.  doi: 10.16708/j.cnki.1000-758X.2017.0048
    Abstract ( 866 )   PDF (5438KB) ( 994 )   Save
    Atultra-lowspeed,theprecisionofgimbalspeedmeasurementisakeyfactorwhichinfluencesthecontrolaccuracyofacontrolmomentgyro(CMG)gimbalsystem.Focusingontheproblemofnoiseamplificationbroughtbyconventionalfirst-orderbackwarddifferentiatorwhencalculatingultra-lowspeed,areal-timespeedestimationmethodbasedonanonlineartrackingdifferentiatoranditsdiscretetimeexpressionusingthefourthorderRunge-Kuttamethodwasproposed.Acompositespeedmeasuringmethodwaspresentedtosolvethetrackingdelayproblemwhenusingtrackingdifferentiatorsdirectly.Then,thenumericalsimulationandexperimentwereconducted.Thesimulationresultsdemonstratethatthespeedestimationmethodproposedcouldreducethequantizationnoisesbroughtbytachometersandmeasurementnoises.Theexperimentalresultsshowthatbyusingtracking-differentiatorsthefluctuationofgimbalspeedisreducedby67.1%.
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