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1、IEEETRANSACTIONSONIMAGEPROCESSING,VOL.I.NO.4,OCTOBER1992505ConvolutionBackprojectionImageReconstructionforSpotlightModeSyntheticApertureRadarMitaD.Desai,Member,IEEE,andW.KennethJenkins,Fellow,IEEEAbstract-Syntheticapertureradar(SAR)imagereconstruc-tob
2、eaveryeffectivemicrowaveimagingtechniquefortionfallsintotheclassofinverse(deconvolution)problems.Ahighresolutiongroundmapping,remotesensing,andsur-spotlightmodeSARsystemobtainslineintegrals(projections)veillanceapplications.Recently,aspartofNASA’sMa-o
3、fthegroundreflectivityatvariouslookanglesastheradarplatformprogressesalongtheflighttrajectory.TheimageofgellanmissionaSARwasplacedintoorbitaroundVenusthegroundareaisthenreconstructedfromthissetofprojec-inthehopeofprovidingmanwithhisfirstcompleteunob-t
4、ions.Conventionally,theSARimagehasbeenproducedbyastructedviewofthiscloud-coveredplanet’ssurface.directFourierreconstructionalgorithmreferredtohereastheSARsystemsyieldimagesintwodimensions,gener-2-DinverseFFTmethod.Thismethodhastwomajorprob-allycalledt
5、herangeandtheazimuth(crossrange)inthelems:1)duetothebatchprocessingnatureoftheFFT,allre-turnsmustberecordedbeforetheimageprocessingcanbegin,slantplane.Theazimuthcoincideswiththedirectionofand2)apolar-to-Cartesianinterpolation,whichiscomputa-theflightp
6、athoftheradarplatform.Therangedirection,tionallyintensiveanderrorproneduetointerpolationinaccur-whichisthecoordinatethatisorthogonaltotheazimuth,acies,isnecessarybeforea2-DinverseFFTcanbeperformed.isthedirectionoftransmittingandreceivingthesignal.Inth
7、ispaper,amethodbasedonaconvolutionbackprojec-Inthespotlightmodeofoperationtheantennaissteeredtion(CBP)algorithmispresented.CBPisawidelyusedtech-niqueincomputer-aidedtomography(CAT).TheCBPalgo-throughouttheflightintervaltoilluminateafixedareaofrithmhas
8、beenmodifiedandappliedtoimagereconstructioninterest,enablingonetorecordechoesatappropriatepo-fromSARdata.Aquantitativeevaluationusingcomputersim-sitionsalongtheflightpath,andthroughsignalprocess-ulationoftheCBPalgorithmforspotlightmodeSARispre
