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NonlinearRangeCellMigration(RCM)CompensationMethodforSpaceborne/AirborneForward-LookingBistaticSAR
ZheLiu,JianyuYang,XiaolingZhangSchoolofElectronicEngineering,UniversityofElectronicScienceandTechnologyofChina,Chengdu,611731,ChinaPresentationby
ZheLiuNonlinearRangeCellMiOutlineIntroductiontotheSA-FBSARanditsnonlinearRMCNonlinearRCMcompensationmethodSimulationresultsConclusionsandfurtherworkOutlineIntroductiontotheSA-Introduction-WhatisSA-FBSARSpaceborne/AirborneForward-LookingBistaticSAR(SA-FBSAR)Platforms:TransmitterandreceiverofSA-FBSARarelowearthorbit(LEO)satellite
andaircraft,respectively.WorkingModes:Transmitterantennaworksinside-lookingorsquint-lookingmode;receiverantennainforward-lookingmode.Targetimagingscene:Targetsceneisalongthereceiver’sforward-lookingdirectiontransmitterreceiverImagingsceneIntroduction-WhatisSA-FBSARSIntroduction-EmergenceofSA-FBSARMonostaticSARBistatic/MultistaticSAR(B/MSAR)SpaceborneB/MSARAirborneB/MSARS-AB/MSARCommu.satelliteBroadcastsatelliteRadarsatelliteDiversityoftargetinformationHighimmunitytoattacksLowcostWidecoverage,highSNRPlatformflexibilityPowersavingwidebandrepeatedobservationSA-BSARwithradarsatelliteSA-FBSARattractivepotentialforaircraftlandingandnavigationIntroduction-EmergenceofSA-FIntroduction-EmergenceofSA-FBSARInNov.2009,FGAN(GermanAerospaceCenter)launchedthefirstexperimenttotestthefeasibilityofSA-FBSAR.Fig.1ImagingresultofthefirstSA-FBSARfeasibilityexperimentin2009Introduction-EmergenceofSA-FIntroduction-ChallengesofSA-FBSARimaging
·
DramaticgeometricdifferenceSatelliteheight:500-800kmAircraftheight:1-5km
·
EssentialvelocitydifferenceSatellitevelocity:7.4-7.6km/sAircraftvelocity:100m/s
·
DifferentworkingmodeSatellite:side-lookingAircraft:forward-lookingIntroduction-ChallengesofSA-Introduction-ChallengesofSA-FBSARimaging
·
Dramaticgeometricdifference
·
Essentialvelocitydifference
·
DifferentworkingmodeRangecellmigration(RCM)featuresare:Varywiththetarget’srangeandazimuthlocationexhibitssignificantnonlinearitywithtarget’srangelocationSeveredistortionandnonlinearmisregistrationwilloccur,ifsuchRCMisnotproperlycompensatedIntroduction-ChallengesofSA-Introduction-effectofnonlinearRCMonimagingresultsFig2.Imagingresultofpointtargets(a)originalpointscatterers(b)withoutRCMcompensationIntroduction-effectofnonlinexy(a)originalareatarget(b)WithoutRCMCIntroduction-effectofnonlinearRCMonimagingresultsFig3.Imagingresultofareatargetsxy(a)originalareatarget(b)Introduction-OurworkPurpose:findanonlineartwo-dimensionalRCMcompensationmethodforSA-FBSARinfrequencydomainMainidea:SetupSA-FBSARresponsespectrummodelDeducenonlinearRCManalyticformulaProposeSA-FBSARnonlinearRCMcompensationmethodIntroduction-OurworkPurpose:NonlinearRCMCompensationforSA-FBSAR
-systemgeometricmodelFig.4SA-FBSARsystemgeometryNonlinearRCMCompensationfor.
OriginofnonlinearRCM.OriginofnonlinearRCMNonlinearRCMCompensationforSA-FBSAR
-systemsignalspectrummodelNonlinearRCMCompensationforNonlinearRCMCompensationforSA-FBSAR
-nonlinearRCManalyticformulaNonlinearRCMCompensationforNonlinearRCMCompensationforSA-FBSAR
-nonlinearRCManalyticalformulaNonlinearRCMCompensationforNonlinearRCMCompensationforSA-FBSAR
-nonlinearRCMcompensationmethodFig.5flowchartofnonlinearRCMcompensationmethodforSA-FBSAR,NonlinearRCMCompensationforSimulation-ParametersParametersTransmitterReceiverHeight(km)5143velocity(m/s)7600100azimuthbeamwidth(degree)0.332.9maximumsteeringangle(degree)0.7515depressionangle(degree)3768beamvelocity(m/s)2100700integrationduration(s)0.43pulsewidth(μs)2centralfrequencyoftransmittingsignal(GHz)9.65bandwidthoftransmittingsignal(MHz)60pulserepetitionfrequency(Hz)2500Simulation-ParametersParametSimulation-Pointscatterers(a)originalpointscatterers(b)withoutRCMcompensation(d)withtheproposedmethod(c)withRCMCMethodinRef[1]Ref[1]:X.Qiu,D.HuandC.Ding,IEEEGeosci.RemoteSens.Lett.,4,735-739,2008.
Fig.6Imagingresultsof15pointscattersSimulation-Pointscatterers(Simulation-Pointscatterers(a)errorinrangeposition(b)errorinazimuthpositionSimulation-Pointscatterers(Simulation-areatargetxyFig.7Imagingresultsofareatarget(a)originalareatarget(b)WithoutRCMC(c)WiththeproposedRCMcompensationSimulation-areatargetxyFig.Fig.8two-dimensionalresolutionperformance(a)Contourofidealresolutioncell’sarea(unit:m2)(b)targetlocatedat(500,100)(c)targetlocatedat(0,0)Fig.8two-dimensionalresolutiSimulationFromtheabovesimulationresults,wecouldfindthat:
UncompensatedRCMcoulddeteriorateimagingresultseverely,causenonlineardistortion
RCMcompensationmethoddesignedforotherFBSARsystemcouldnotcompensatethenonlinearRCM,thuscouldnotbeappliedtoSA-FBSAR.
TheproposedRCMcompensationmethodcouldeffectivelycompensatethenonlinearRCMinSA-FBSAR,andalltargetsarearrangedintheiroriginallycorrectpositions.
SimulationFromtheabovesimulConclusions&FurtherworkRCMinSA-FBSARnotonlydependsonthetarget’stwo-dimensionalspacelocation,butalsovarieswithitsrangelocationnonlinearly.Ifnotproperlycorrected,RCMwouldcausenonlineardistortionintheimageandgreatlydegradetheimagingquality.Weproposeatwo-dimensionalnonlinearRCMCmethodforSA-FBSAR.Thevalidityoftheproposedmethodisverified.FurtherimprovementonresolutionperformanceisunderresearchConclusions&FurtherworkRCMThankyouThankyouNonlinearRangeCellMigration(RCM)CompensationMethodforSpaceborne/AirborneForward-LookingBistaticSAR
ZheLiu,JianyuYang,XiaolingZhangSchoolofElectronicEngineering,UniversityofElectronicScienceandTechnologyofChina,Chengdu,611731,ChinaPresentationby
ZheLiuNonlinearRangeCellMiOutlineIntroductiontotheSA-FBSARanditsnonlinearRMCNonlinearRCMcompensationmethodSimulationresultsConclusionsandfurtherworkOutlineIntroductiontotheSA-Introduction-WhatisSA-FBSARSpaceborne/AirborneForward-LookingBistaticSAR(SA-FBSAR)Platforms:TransmitterandreceiverofSA-FBSARarelowearthorbit(LEO)satellite
andaircraft,respectively.WorkingModes:Transmitterantennaworksinside-lookingorsquint-lookingmode;receiverantennainforward-lookingmode.Targetimagingscene:Targetsceneisalongthereceiver’sforward-lookingdirectiontransmitterreceiverImagingsceneIntroduction-WhatisSA-FBSARSIntroduction-EmergenceofSA-FBSARMonostaticSARBistatic/MultistaticSAR(B/MSAR)SpaceborneB/MSARAirborneB/MSARS-AB/MSARCommu.satelliteBroadcastsatelliteRadarsatelliteDiversityoftargetinformationHighimmunitytoattacksLowcostWidecoverage,highSNRPlatformflexibilityPowersavingwidebandrepeatedobservationSA-BSARwithradarsatelliteSA-FBSARattractivepotentialforaircraftlandingandnavigationIntroduction-EmergenceofSA-FIntroduction-EmergenceofSA-FBSARInNov.2009,FGAN(GermanAerospaceCenter)launchedthefirstexperimenttotestthefeasibilityofSA-FBSAR.Fig.1ImagingresultofthefirstSA-FBSARfeasibilityexperimentin2009Introduction-EmergenceofSA-FIntroduction-ChallengesofSA-FBSARimaging
·
DramaticgeometricdifferenceSatelliteheight:500-800kmAircraftheight:1-5km
·
EssentialvelocitydifferenceSatellitevelocity:7.4-7.6km/sAircraftvelocity:100m/s
·
DifferentworkingmodeSatellite:side-lookingAircraft:forward-lookingIntroduction-ChallengesofSA-Introduction-ChallengesofSA-FBSARimaging
·
Dramaticgeometricdifference
·
Essentialvelocitydifference
·
DifferentworkingmodeRangecellmigration(RCM)featuresare:Varywiththetarget’srangeandazimuthlocationexhibitssignificantnonlinearitywithtarget’srangelocationSeveredistortionandnonlinearmisregistrationwilloccur,ifsuchRCMisnotproperlycompensatedIntroduction-ChallengesofSA-Introduction-effectofnonlinearRCMonimagingresultsFig2.Imagingresultofpointtargets(a)originalpointscatterers(b)withoutRCMcompensationIntroduction-effectofnonlinexy(a)originalareatarget(b)WithoutRCMCIntroduction-effectofnonlinearRCMonimagingresultsFig3.Imagingresultofareatargetsxy(a)originalareatarget(b)Introduction-OurworkPurpose:findanonlineartwo-dimensionalRCMcompensationmethodforSA-FBSARinfrequencydomainMainidea:SetupSA-FBSARresponsespectrummodelDeducenonlinearRCManalyticformulaProposeSA-FBSARnonlinearRCMcompensationmethodIntroduction-OurworkPurpose:NonlinearRCMCompensationforSA-FBSAR
-systemgeometricmodelFig.4SA-FBSARsystemgeometryNonlinearRCMCompensationfor.
OriginofnonlinearRCM.OriginofnonlinearRCMNonlinearRCMCompensationforSA-FBSAR
-systemsignalspectrummodelNonlinearRCMCompensationforNonlinearRCMCompensationforSA-FBSAR
-nonlinearRCManalyticformulaNonlinearRCMCompensationforNonlinearRCMCompensationforSA-FBSAR
-nonlinearRCManalyticalformulaNonlinearRCMCompensationforNonlinearRCMCompensationforSA-FBSAR
-nonlinearRCMcompensationmethodFig.5flowchartofnonlinearRCMcompensationmethodforSA-FBSAR,NonlinearRCMCompensationforSimulation-ParametersParametersTransmitterReceiverHeight(km)5143velocity(m/s)7600100azimuthbeamwidth(degree)0.332.9maximumsteeringangle(degree)0.7515depressionangle(degree)3768beamvelocity(m/s)2100700integrationduration(s)0.43pulsewidth(μs)2centralfrequencyoftransmittingsignal(GHz)9.65bandwidthoftransmittingsignal(MHz)60pulserepetitionfrequency(Hz)2500Simulation-ParametersParametSimulation-Pointscatterers(a)originalpointscatterers(b)withoutRCMcompensation(d)withtheproposedmethod(c)withRCMCMethodinRef[1]Ref[1]:X.Qiu,D.HuandC.Ding,IEEEGeosci.RemoteSens.Lett.,4,735-739,2008.
Fig.6Imagingresultsof15pointscattersSimulation-Pointscatterers(Simulation-Pointscatterers(a)errorinrangeposition(b)errorinazimuthpositionSimulation-Pointscatterers(Simulation-areatargetxyFig.7Imagingresultsofareatarget(a)originalareatarget(b)WithoutRCMC(c)WiththeproposedRCMcompensationSimulation
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