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基于间歇采样和移频转发的SAR复合干扰 Title:InterferenceMitigationinSyntheticApertureRadarSystemsusingIntermittentSamplingandFrequencyShiftingRelay Abstract: Withtheincreasingdeploymentofsyntheticapertureradar(SAR)systems,theissueofcompositeinterferencearisingduetointermittentsamplingandfrequencyshiftingrelayhasbecomeacriticalchallenge.Thispaperaimstoaddressthisproblembyproposinganovelinterferencemitigationtechnique.Theproposedtechniquecombinesintermittentsamplingandfrequencyshiftingrelaytoeffectivelysuppresscompositeinterference,thusenhancingtheoverallperformanceofSARsystems.ExperimentalresultsdemonstratetheeffectivenessoftheproposedtechniqueinmitigatinginterferenceandimprovingthequalityofSARimages. 1.Introduction SyntheticApertureRadar(SAR)hasgainedsignificantattentionduetoitscapabilitytoprovidehigh-resolutionimages,eveninadverseweatherconditions.However,theperformanceofSARisaffectedbyvariousinterferencesources,suchascompositeinterferencecausedbyintermittentsamplingandfrequencyshiftingrelay.CompositeinterferencedegradesthequalityofSARimages,makingthemlessreliableforaccuratetargetdetectionandidentification.Therefore,thereisaneedforeffectiveinterferencemitigationtechniquestoenhancetheperformanceofSARsystems. 2.InterferenceAnalysis ThissectionprovidesadetailedanalysisofthecompositeinterferenceinSARsystemsanditsimpactonimagequality.WeexaminethecausesofintermittentsamplingandfrequencyshiftingrelayinterferenceanddiscusstheireffectsonSARimaging.Byunderstandingthecharacteristicsofcompositeinterference,wecanbetterdesigninterferencemitigationtechniques. 3.ProposedInterferenceMitigationTechnique TheproposedtechniquecombinesintermittentsamplingandfrequencyshiftingrelaytomitigatecompositeinterferenceinSARsystems.Firstly,intermittentsamplingisemployedtoreducetheinterferencecausedbyintermittentsignalperiods.Bycarefullyselectingthesamplingintervals,theinterferencecomponentscanbeeffectivelyattenuated.Secondly,afrequencyshiftingrelayisintroducedtomitigatetheinterferencecausedbyfrequencyshifting.Ther