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简介：Amethod(Rieland,1985)hasbeenmodifiedtodeterminethedownwardsolarradiationatgroundoverEastAsia,usingGMS-3dataofthesatellitewithaspatialresolutionof10×10krn~2andatimeintervalof3hours.ThedistributionsofthemonthlymeanglobalradiationareobtainedforJanuary,April,JulyandOctoberof1985.TheseresultsillustratethatthetopographyeffectoftheTibetanPlateauisnotnegligible.ThevaluesofglobalradiationoverthehighTibetanPlateauduringallseasonsarehigherthanthoseinthelower-levelsurroundings.Bycomparingmodelresultswithgroundobserveddata,therelativeerrorsinmonthlyaveragesofglobalradiationare2.8％forclearskyand6.3％,5.3％,5.0％and4.5％forcloudyskyinJanuary,April,JulyandOctober,respectively.Therelativeerrorindailyglobalradiationduringthesnow-freeseasonislessthan20％andlargerthan20％insnow-coveredwinter.We,however,hadnodataforthesecomparisonswhichweremeasureddirectlyatthePlateauduringtheyear1985.

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简介：Animprovedabsolutecalibrationtechnologybasedonindirectmeasurementswasdevelopedthroughtwoprobativeexperiments,theperformanceofwhichwasevaluatedbyapplyingtheapproachtoinsituseasurfaceheight(SSH)attheTianhengIsland(tidalgauge)andthesatellitenadir(GPSbuoy).UsingGeoid/MSS(meanseasurface)data,whichaccountedforaconstantoffsetbetweennadirandonshoretidalgaugewaterlevels,andTMD(tidalmodeldriver),whichcanceledoutthetime-varyingoffsets,nadirSSH(seasurfaceheight)couldbeindirectlyacquiredatanonshoretidalgaugeinsteadoffromdirectoffshoreobservation.TheapproachextrapolatedtheonshoreSSHouttotheoffshorenadirwithanaccuracyof(1.88±0.20)cmandastandarddeviationof3.3cm,whichsuggestedthattheapproachpresentedwasfeasibleinabsolutealtimetercalibration/validation(Cal/Val),andtheapproachenormouslyfacilitatedtheobtainingSSHfromtheoffshorenadir.

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简介：精确的海表面流动大小为理解全球水和精力周期是关键的。海洋的蒸发，是全球海洋的新鲜的水流动的一个主要部件，为预言海洋的循环和运输是有用的。全球Goddard基于卫星的表面狂暴的流动Version-2(GSSTF2；1987年7月2000年12月)正式在2001被释放的日期集合被科学界广泛地为全球精力和水周期研究使用了，并且地区性、短的时期数据分析。我们最近被NASA资助了恢复与不断地生产海表面的一致数据集的一个目的处理GSSTF数据集狂暴的流动，源于遥感数据。数据集是是reprocessed并且带新(GSSTF2b)使用改进了象最近升级的NCEP/DOE海表面温度分析那样的输入数据集，并且从传感器微波成像器(SSM/I)由遥感系统(RSS)生产了的专辑的升级的表面风和微波亮度温度V6数据集(版本6)。第二个新产品(GSSTF3)进一步被建议与一更好时间(12-h)并且空间(0.25°×0.25°)分辨率。GSSTF2b(1987年7月2008年12月)和GSSTF3(1999年7月2009年12月)将被2009年末和2011年初分别地为研究社区释放到使用。

简介：Satelliteattitudeinformationisessentialforpico-satelliteapplicationsrequiringlight-weight,low-power,andfast-computationcharacteristics.Theobjectiveofthisstudyistoprovideamagnetometer-onlyattitudeestimationmethodforalow-altitudeEarthorbit,biasmomentumpico-satellite.Basedontwoassumptions,thespacecraftsphericalsymmetryanddampingofbodyrates,alinearkinematicsmodelofabiasmomentumsatellite'spitchaxisisderived,andthelinearestimationalgorithmisdeveloped.ThealgorithmcombinesthelinearKalmanfilter(KF)withtheclassicthree-axisattitudedeterminationmethod(TRIAD).KFisusedtoestimatesatellite'spitchaxisorientation,whileTRIADisusedtoobtaininformationconcerningthesatellite'sthree-axisattitude.Simulationtestsconfirmedthatthealgorithmissuitedtothetime-varyingmodelerrorsresultingfrombothassumptions.Theestimateresultkeepstrackingsatelliteattitudemotionduringalldamping,stable,andfreerotatingcontrolstages.Comparedwithnonlinearalgorithms,suchasextendedKalmanfiler(EKF)andsquarerootunscentedKalmanfiler(SRUKF),thealgorithmpresentedherehasanalmostequalperformanceintermsofconvergencetimeandestimationaccuracy,whiletheconsumptionofcomputingresourcesismuchlower.

简介：Awidevarietyofalgorithmshavebeendevelopedtomonitoraerosolburdenfromsatelliteimages.Still,fewsolutionscurrentlyallowforreal-timeandefficientretrievalofaerosolopticalthickness(AOT),mainlyduetotheextremelylargevolumeofcomputationnecessaryforthenumericsolutionofatmosphericradiativetransferequations.TakingintoaccounttheeffortstoexploittheSYNergyofTerraandAquaModis(SYNTAM,anAOTretrievalalgorithm),wepresentinthispaperanovelmethodtoretrieveAOTfromModerateResolutionImagingSpectroradiometer(MODIS)satelliteimages,inwhichthestrategyofblockpartitionandcollectivecommunicationwastaken,therebymaximizingloadbalanceandreduc-ingtheoverheadtimeduringinter-processorcommunication.ExperimentswerecarriedouttoretrieveAOTat0.44,0.55,and0.67mofMODIS/TerraandMODIS/Aquadata,usingtheparallelSYNTAMalgo-rithmintheIBMSystemCluster1600deployedatChinaMeteorologicalAdministration(CMA).Resultsshowedthatparallelimplementationcangreatlyreducecomputationtime,andthusensurehighparallelefficiency.AOTderivedbyparallelalgorithmwasvalidatedagainstmeasurementsfromground-basedsun-photometers;inallcases,therelativeerrorrangewaswithin20%,whichdemonstratedthattheparallelalgorithmwassuitableforapplicationssuchasairqualitymonitoringandclimatemodeling.

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简介：ＡｓｔｕｄｙｏｆａｎｅｗｒｅｔｒｉｅｖａｌａｌｇｏｒｉｔｈｍｆｏｒｍｅａｓｕｒｅｍｅｎｔｏｆｏｃｅａｎｉｃｗｉｎｄｖｅｃｔｏｒｓｆｉｅｌｄｕｓｉｎｇｓａｔｅｌｌｉｔｅｍｉｃｒｏｗａｖｅｓｃａｔｔｅｒｏｍｅｔｅｒＬｉｎＭｉｎｇｓｅｎ，ＳｕｎＹｉｎｇ，Ｚ...

简介：Theseasonalvariabilityofthesignificantwaveheight(SWH)intheSouthChinaSea(SCS)isinvestigatedusingthemostup-to-dategriddeddailyaltimeterdatafortheperiodofSeptember2009toAugust2015.TheresultsindicatethattheSWHshowsauniformseasonalvariationinthewholeSCS,withitsmaximaoccurringinDecember/JanuaryandminimainMay.Throughouttheyear,theSWHintheSCSisthelargestaroundLuzonStrait(LS)andthengraduallydecreasessouthwardacrossthebasin.Thesurfacewindspeedhasasimilarseasonalvariation,butwithdifferentspatialdistributionsinmostmonthsoftheyear.FurtheranalysisindicatesthattheobservedSWHvariationsaredominatedbyswell.Thewindseaheight,however,ismuchsmaller.ItisthethelargestintworegionssouthwestofTaiwanIslandandsoutheastofVietnamCoastduringthenortheasterlymonsoon,whilethelargestinthecentral/southernSCSduringthesouthwesterlymonsoon.Theextremewaveconditionalsoexperiencesasignificantseasonalvariation.InmostregionsofthenorthernandcentralSCS,themaximaofthe99thpercentileSWHthatarelargerthantheSWHtheoreticallycalculatedwiththewindspeedforthefullydevelopedseasmainlyappearinAugust–November,closelyrelatedtostrongtropicalcycloneactivities.Comparedwithpreviousstudies,itisalsoimpliedthatthewaveclimateinthePacificOceanplaysanimportantroleinthewaveclimatevariationsintheSCS.

简介：蚂蚁殖民地优化(ACO)基于平衡路由的负担，波长赋值(RWA)算法(ALRWA)为完成在全部光卫星网络上平衡的仙女般的负担的缘故被提出。一个多客观的优化模型就全球交通分发的特征而言被建立。这不仅采用交通紧张修改轻路径费用，而且监视光内部卫星的连接(ISL)的波长利用。然后，一个ACO算法被利用解决这个模型，导致发现为每个连接请求的一条最佳的轻路径。最佳的轻路径让最小的轻路径花费了在下面令人满意波长利用，传播延期和波长连续性的限制。模拟结果证明ALRWA在堵住概率表现很好并且认识到有效负担平衡。同时，平均传播延期能满足即时企业传播的基本要求。

简介：ThispaperaddressestheintegratedEarthobservationsatelliteschedulingproblem.Itisacomplicatedproblembecauseobservinganddownloadingoperationsarebothinvolved.Weuseanacyclicdirectedgraphmodeltodescribetheobservinganddownloadingintegratedschedulingproblem.Basedonthemodelwhichconsideringenergyconstraintsandstoragecapacityconstraints,wedevelopanefficientsolvingmethodusinganovelquantumgeneticalgorithm.Wedesignanewencodinganddecodingschemethatcangeneratefeasiblesolutionandincreasethediversityofthepopulation.TheresultsofthesimulationexperimentsshowthattheproposedmethodsolvestheintegratedEarthobservationsatelliteschedulingproblemwithgoodperformanceandoutperformsthegeneticalgorithmandgreedyalgorithmonallinstances.

简介：Thestudyontheacquisitionandtrackingsimulationsysteminsatellite-groundopticalcommunicationsispresentedhere.Byapplyingglobalpositioningsystem(GPS)coordinatecalculation,thetimeneededininitialacquisitionoflightbeaconcanbereducedlargely.Smithpredictorisappliedtocompensatethemechanicalhysteresisoftrackingsystemandtoimprovethedynamicperformanceofthesystem.Trackingexperimentsovera16kmdistanceonthegroundareconductedtoverifythetrackingoflightbeaconinsatellite-groundopticalcommunications.Thestandarddeviationofhorizontalcoordinatesis35.3568μradandthemaximumoffsetis209.3675μradinstabletracking.

简介：Multisatellitedataisusedtoanalyzethecharacteristicsofthreeeyewallreplacementcycles(ERCs)duringthelifetimeofTyphoonMuifa(1109).Spiralrainbandsevolutions,concentriceyewall(CE)structuremodes,CEdurations,andintensitychangesarediscussedindetail.Inaddition,anERCevolutionmodelofTyphoonMuifaisgiven.Therearefourmainfindings.(1)Theouterspiralrainbandjoinsendtoendtoformtheoutereyewallafteritdisconnectsfromtheoriginal(inner)eyewall.Theinnereyewallweakensastheoutereyewallbecomesaxisymmetricandisintensified.Thecontractionoftheoutereyewallcausestheinnereyewalltodissipaterapidly.Finally,theERCendswithanannulareyewallorspiralrainbands.(2)AlthoughtheCEdurationtimesofTyphoonMuifa’sthreeERCscoveredalargerange,theCEstructureswereallmaintainedforapproximately5hfromtheformationoftheaxisymmetricoutereyewalltotheendofthecycle.(3)Thereisnoobviousprecipitationreflectivityintheeyeormoatregionforthesubsidenceflow.Theconvectionwithinthetwoeyewallsisorganizedasaradiallyoutwardslopewithincreasingheight.(4)TyphoonintensityestimationresultsbasedonADTmaynotexplaintheintensityvariationsassociatedwithERCcorrectly,whilethetyphoon’swarmcoredataretrievedfromAMSU-Aworkswell.

简介：航行卫星的自治航行被讨论。用交叉连接的方法ofauto轨道决心变化，抑制的取向参数被提出。根据它的可行性的分析，一些有用结论被给。

简介：Usingfoursatellitedatasets(TOMS/SBUV,OMI,MLS,andHALOE),weanalyzetheseasonalvariationsofthetotalcolumnozone(TCO)anditszonaldeviation(TCO*),andrevealtheverticalstructureoftheOzoneLow(OV)overtheAsiancontinent.Ourprincipalfindingsare:(1)TheTCOovertheAsiancontinentreachesitsmaximuminthespringanditsminimumintheautumn.TheOzoneLowexistsfromMaytoSeptember.(2)TheOzoneLowhastwonegativecores,locatedinthelowerandtheupperstratosphere.Thelowercoreisnear30hPainthewinterand70hPaintheotherseasons.Theuppercorevariesfrom10hPato1hPaamongthefourseasons.(3)ThepositionoftheOzoneLowinthelowerandtheupperstratosphereovertheAsiancontinentshowsseasonalvariability.