第三章航天器通信内容之遥感和卫星通信分解课件

ContentsofSpacecraftCommunicationRemotesensingandsatellitecommunication)(遥感和卫星通信)◆RemoteSensingImageMicrowaveImagingTechnology(微波成像)Microwave:electromagneticwaveswithfrequencyof300MHzM300GHz,correspondingtoawavelengthof1m1mm;withahighfrequencyandfrequencybandwidth,largeinformationcapacity,andsmallwavelengthanpenetratethe(电离)gooddirectionfeaturesMicrowaveImaging:AimagingmeanusingmicrowaveasthelinformationcarrierYTheory:Usemicrowavetoirradiate(照射)theobject,andthenreconstructtheobjectoritspermittivity(介电常数)distributionbymeasuringtheexternalscattered(散射)fieldoftheobject●SyntheticApertureRadar(SAR)合成孔径雷达口Usingtherelativemotionoftheradarandthetarget,synthesize(合成)arealsmallsizeantennaaperture(孔径)asalargeequivalent(等价的)antennaapertureradarCharacteristic;Highresolution,canworkaroundtheclock(全天候)canefficientlyidentifycamouflage(伪装andpenetratecovering(穿透掩盖物)ˇPurpose:Aerialsurvey航空测量,aerialremotesensing航空遥感,satelliteoceanobservations卫星海洋观测,spacesurveillance航天侦察,Imagematchingguidance图像匹配制导SpaceExploration:xplorethegeologicalstructure地质结构oftheMoonandthevenus合威孔雷站工的几何灵●Three-dimensionalDigitalimaging(三维数字成像)YFormatdigitalimagewiththethree-dimensionalcoordinates(Ak标)ofgroundtargeYTheory:Whileobtainingmulti-bandspectralthatreflectsgroundtargetsradiation(fEAf)'senergyinformation,synchronouslyacquirethevariousdataandparametersaboutearthpositioning(X,Y,Z).Bysimplesynchronouscalculationandreal-timeprocessing,sothatinindigitalimage,eachpixelconstitutedofbandspectralenergyinformationofgroundtargetscontainsthreedimensionalgeographiccoordinatevalues(x,Y,z)●Hyperspectral(高光谱)ImageSpectralresolutionintherangeofmagnitude(量级/10口Intheelectromagneticspectrum:visible可见,nearinfrared近红外themid-infrared中红外andthermalinfraredrange热红外DAcontinuousimagedatatechnologybygettingalotofverynarrowspectralaWhileacquirethesurfaceoftheimageinformation,alsoobtainspectralinformation.Itfi