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1、786IEEETRANSACTIONSONGEOSCIENCEANDREMOTESENSING,VOL32,NO.4,JULY1994PrecisionSARProcessingUsingChirpScalingR.KeithRaney,Fellow,ZEEE,H.Runge,RichardBamler,IanG.Cumming,andFrankH.WongAbstmct-Aspace-variantinterpolationisrequiredtocom-8pointkernels,whichfavorstheeff
2、iciencysideofthepensateforthemigrationofsignalenergythroughrangeres-tradeoff:precisionSARprocessinglosesoutinthebar-olutioncellswhenprocessingsyntheticapertureradar(SAR)gain.data,usingeithertheclassicalrangelDoppler(RID)algorithmorrelatedfrequencydomaintechnique
3、s.Ingeneral,interpo-Severalresearchers[6],[17]haveexaminedSARpro-lationrequiressignificantcomputationtime,andleadstolosscessingalgorithmsbasedontheseismicwaveequationofimagequality,especiallyinthecompleximage.Thenewchirpformulations[22],[5].Wavenumberdomainmetho
4、dsscalingalgorithmavoidsinterpolation,yetperformsrangecellhavetheadvantageofdealingdirectlywiththenaturalmigrationcorrectionaccurately.Thealgorithmrequiresonlypolarcoordinatesystemarisingfromwavepropagation,complexmultipliesandFouriertransformstoimplement,isin-h
5、erentlyphasepreserving,andissuitableforwide-swath,large-andachievemostsignalprocessingoperationsinthetwo-beamwidth,andlarge-squintapplications.Thispaperde-dimensionalfrequencydomainwitharelativelysimplescribesthechirpscalingalgorithm,summarizessimulationre-phase
6、multiply.Thedominantdisadvantageofwavenum-sults,presentsimageryprocessedwiththealgorithm,andre-berdomainapproachesisthataninterpolatorisneededtoviewsquantitativemeasuresofitsperformance.Basedonmatchtherange-dependentRCMCparametervariations,quantitativecomparison
7、,thechirpscalingalgorithmprovidesimagequalityequaltoorbetterthantheprecisionrangeleitherfortheStoltchangeofvariablesinthetwo-dimen-Dopplerprocessor.Overtherangeofparameterstested,imagesionalfrequencydomain[5]orfortheresidualRCMCinqualityresultsapproachthetheoret
8、icallimit,asdefinedbythetherange/Dopplerdomain[171.systembandwidth.ThecontributionofthepresentworkisaSARprocess-ingalgorithmthatretainsreasonableefficiency,whileatI.I
