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一种FMCWInSAR系统时变基线估计方法
Title:Time-VaryingBaselineEstimationMethodforFMCWInSARSystem
Abstract:
Thispaperproposesatime-varyingbaselineestimationmethodforfrequencymodulatedcontinuouswavesyntheticapertureradar(FMCWInSAR)systems.TheaccurateestimationofbaselineiscrucialinInSARsystemsasitdirectlyaffectsthequalityofinterferometricmeasurements.Theproposedmethodcombinesfrequencyshiftestimationandphaseunwrappingtechniquestoestimatethetime-varyingbaseline.Theeffectivenessoftheproposedmethodisdemonstratedthroughsimulateddataandreal-worldexperiments.
1.Introduction:
Syntheticapertureradar(SAR)systemshavebeenwidelyusedforremotesensingapplications.InSARisaspecifictypeofSARtechniquethatenablesthemeasurementofEarth'stopographyanddeformationovertime.AkeyparameterintheInSARtechniqueisthebaseline,whichrepresentstheseparationbetweenthetwoantennasusedinthesystem.Theaccurateestimationofthebaselineiscrucialforachievinghighprecisionininterferometricmeasurements.However,inFMCWInSARsystems,thebaselinecanvaryovertimeduetovariousfactors,suchasplatformmotion,atmosphericeffects,andchangesinthescenebeingobserved.
2.FMCWInSARSystemOverview:
TheFMCWInSARsystemutilizesafrequencymodulatedcontinuouswavetoilluminatethescene.Bymeasuringthephasedifferencebetweentworeceivedsignals,thesystemcanachieveinterferometricmeasurementsandgeneratehigh-resolutionelevationmapsordeformationmeasurements.Thebaselineestimationisperformedtoaccuratelydeterminethephasedifference.
3.Time-VaryingBaselineEstimationMethod:
Theproposedmethodfortime-varyingbaselineestimationinvolvestwomainsteps:frequencyshiftestimationandphaseunwrapping.
3.1FrequencyShiftEstimation:
ThefrequencyshiftestimationutilizestheFMCWsignalproperties.Byanalyzingasetofsyntheticrange-compressedechoes,itispossibletoestimatethefrequencyshiftcausedbythetime-varyingbaseline.ThisestimationisachievedbyutilizingtheFourierTransformtoextracttheDopplerfrequencyshiftcausedbythebaseline.
3.2PhaseUnwrapping:
Phaseunwrappingisperformedtocorrectthephaseambiguitycausedbytheinh