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1、2164IEEETRANSACTIONSONGEOSCIENCEANDREMOTESENSING,VOL.38,NO.5,SEPTEMBER2000InterferometricSARSignalAnalysisinthePresenceofSquintMarcBara,StudentMember,IEEE,RolfScheiber,AntoniBroquetas,Member,IEEE,andAlbertoMoreira,SeniorMember,IEEEAbstract—Thispaperdevelopsanana
2、lysisoftheSARimpulsemotionerrorsasaresultofatmosphericturbulences,strongresponsefunctionfromtheinterferometricpointofview,withthewindconditions,etc.Inthespacebornecase,thetrajectoriesintentionofstudyingitsphasebehaviorinthepresenceofhigharemuchmorestable,buttheD
3、opplercentroidexistsbasicallysquintanglevalues.Itwillbepointedoutthatinthiscase,aphaseasaconsequenceoftheEarth’srotationandcurvature.Intherampispresentintherangedirection,which,incombinationwithacertaindegreeofmisregistrationbetweenthetwoimagesinducescaseofERS,t
4、hesatelliteissteeredtocompensatetheDoppleranoffsetinthegeneratedinterferometricphase.Thisbehavior,centroid[7].ForRADARSAT[8],highsquintvaluesoccurdueifnotcompensated,imposesstronglimitsontheperformanceoftothereducedsteeringofthesatellite’sattitude.theinterferome
5、trictechniquesinasquintedcase,especiallyforInbothair-andspacebornecases,itisofextremeimportanceairborneSARsystems.Thearticleproposestwonewtechniques,toconsiderthecorrectpropertiesofthesquintedSARsignalwhichareappropriatetocorrectthephasebiascomingfromthissource.
6、Thefirstoneisbasedonamodificationoftheazimuthcom-[9]toavoiddefocusing.Appropriatetechniquesashighorderpressionfilter,whichcancelsthephaserampoftherangeimpulseinterpolationsorhighorderfilters,asdescribedin[10]fortheresponsefunctionforonespecificsquintvalue.Incase
7、theSARchirpscalingalgorithm,mustbeemployed.processingisperformedwithvariablesquintoverrange,wepro-OneimportantapplicationofSARisbasedonthecombina-poseasecondmethodorientedtoestimatingtheexpectedmisregis-tionof2-Dimagesacquiredfromtwodifferentpointsofviewtrationa
8、ndthus,thephasebiasbymeansofaniterativeapproach.Simulateddataaswellasrealcornerreflectorresponsesareusedtoinanacross-trackconfigurationinordertoformaninterferom-showt
