第三章航天器通信內(nèi)容之遙感和衛(wèi)星通信分解課件

ContentsofSpacecraftCommunicationRemotesensingandsatellitecommunication)(遙感和衛(wèi)星通信)◆RemoteSensingImageMicrowaveImagingTechnology(微波成像)Microwave:electromagneticwaveswithfrequencyof300MHzM300GHz,correspondingtoawavelengthof1m1mm;withahighfrequencyandfrequencybandwidth,largeinformationcapacity,andsmallwavelengthanpenetratethe(電離)gooddirectionfeaturesMicrowaveImaging:AimagingmeanusingmicrowaveasthelinformationcarrierYTheory:Usemicrowavetoirradiate(照射)theobject,andthenreconstructtheobjectoritspermittivity(介電常數(shù))distributionbymeasuringtheexternalscattered(散射)fieldoftheobject●SyntheticApertureRadar(SAR)合成孔徑雷達(dá)口Usingtherelativemotionoftheradarandthetarget,synthesize(合成)arealsmallsizeantennaaperture(孔徑)asalargeequivalent(等價(jià)的)antennaapertureradarCharacteristic;Highresolution,canworkaroundtheclock(全天候)canefficientlyidentifycamouflage(偽裝andpenetratecovering(穿透掩蓋物)ˇPurpose:Aerialsurvey航空測量,aerialremotesensing航空遙感,satelliteoceanobservations衛(wèi)星海洋觀測,spacesurveillance航天偵察,Imagematchingguidance圖像匹配制導(dǎo)SpaceExploration:xplorethegeologicalstructure地質(zhì)結(jié)構(gòu)oftheMoonandthevenus合威孔雷站工的幾何靈●Three-dimensionalDigitalimaging(三維數(shù)字成像)YFormatdigitalimagewiththethree-dimensionalcoordinates(Ak標(biāo))ofgroundtargeYTheory:Whileobtainingmulti-bandspectralthatreflectsgroundtargetsradiation(fEAf)'senergyinformation,synchronouslyacquirethevariousdataandparametersaboutearthpositioning(X,Y,Z).Bysimplesynchronouscalculationandreal-timeprocessing,sothatinindigitalimage,eachpixelconstitutedofbandspectralenergyinformationofgroundtargetscontainsthreedimensionalgeographiccoordinatevalues(x,Y,z)●Hyperspectral(高光譜)ImageSpectralresolutionintherangeofmagnitude(量級/10口Intheelectromagneticspectrum:visible可見,nearinfrared近紅外themid-infrared中紅外andthermalinfraredrange熱紅外DAcontinuousimagedatatechnologybygettingalotofverynarrowspectralaWhileacquirethesurfaceoftheimageinformation,alsoobtainspectralinformation.Itfi