Interferometric Synthetic Aperture Radar

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1、REVIEWARTICLEInterferometricSyntheticApertureRadarChristopherT.AlleninterferometricSARconfiguredtomeasureradialvelocity.TheyusedDepartmentofElectricalEngineeringandComputerScienceandtwohorizontallyseparatedantennastoreceivebackscatteredsignalsRadarSystemsandRemoteSensing

2、Laboratoryfromthemovingseasurface.TheyprocessedthesignalsseparatelytoUniversityofKansasformtwocompleximages,whichtheythencombinedinterferometrically;i.e.,thephasesweredifferencedpixelbypixel.TheyshowedthatsinceradialmotionofasurfacescatterercausesaAbstract.Thispaperprovi

3、desabriefreviewofinterferometricphasedifferencebetweenthetwoimagesthatisproportionaltothesyntheticapertureradar(InSAR),itshistory,thetheory,anddesign/distancemoved,scatterermotioncanbemeasured.implementation/processingissues.Along-track,single-passandGabrielandGoldstein[

4、1988]firstdemonstratedsingle-antenna,repeat-passcross-trackinterferometryarereviewed.Specifictopicsrepeat-passinterferometrybyusingdatacollectedontwoseparateaddressedincludeerrorsourcesandphase-unwrappingtechniques.passesoftheShuttleImagingRadar(SIR-B).Despitethefactthat

5、SeveralexamplesofInSARapplicationsarepresented.theorbitswereskewed,throughrefocussingandcarefulimageregistration,theyobtainedanaltitudemapoftheimagedregion.IntroductionForyearssyntheticapertureradar(SAR)hasbeenusedtoproducephotograph-likeimagesofterrainfeatures.Conventio

6、nalSARsystemsprovideatwo-dimensionalmapoftheradarreflectivityoftheTheoryilluminatedscene.WhilecomplexdataarecollectedandprocessedtoWhereasconventionalSARusesasingleantenna,InSARrequiresproducetheSARimage,oneofthefinalstepsinitsproductionistotwoantennasseparatedbyabaselin

7、e(B).Signalsfrombothantennasreduceacompleximage(containingbothmagnitudeandphasearerecordedandprocessedtoyieldtwocomplexSARimagesoftheinformation)toapurelymagnitudeimage,withthephaseinformationsamescene.Phasesmeasuredineachofthescenesaredifferencedbeingdiscarded.onapixel-

8、by-pixelbasistoobtainadditionalgeometricalinformationRadarinterferometry,ontheotherhand,dependsonphasea