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大气校正仪短波红外通道内部杂散辐射测量方法.docx

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大气校正仪短波红外通道内部杂散辐射测量方法 Title:MeasurementMethodofInternalStrayRadiationsinShortwaveInfraredChannelofAtmosphericCalibrators Abstract: Atmosphericcalibratorsareessentialinstrumentsusedforthecalibrationofremotesensingsensorsandsatelliteimagers.Toensureaccurateandreliablemeasurements,itiscrucialtomitigatetheeffectsofinternalstrayradiationintheinstrument.Thispaperaimstopresentameasurementmethodfortheinternalstrayradiationsintheshortwaveinfrared(SWIR)channelofatmosphericcalibrators.Themethodinvolvesthecharacterizationofthestrayradiations,identificationoftheirsources,andimplementationofsuitablecalibrationtechniquestominimizetheirimpactonmeasurementaccuracy. 1.Introduction Atmosphericcalibratorsplayavitalroleinthecalibrationofremotesensingsensorsandsatelliteimagers.However,internalstrayradiationscansignificantlyaffectthemeasurements,leadingtoinaccurateandunreliabledata.Therefore,itisnecessarytodeveloprobustandcomprehensivemeasurementmethodstoquantifyandmitigatetheeffectsofinternalstrayradiations,particularlyintheSWIRchannel. 2.CharacterizationofInternalStrayRadiations Thefirststepinmeasuringinternalstrayradiationsischaracterizingtheirspectralandspatialdistribution.Thiscanbeachievedbyusingacalibratedradiometerwithhighsensitivityandprecisespectralresolution.TheradiometerisusedtocollectdataonthestrayradiationsemittedwithintheSWIRchannelacrossvariousspectralbands.Theobtaineddatacanhelpidentifythesourcesandintensityofthestrayradiations. 3.SourceIdentificationandElimination Oncethecharacterizationiscomplete,thenextstepistoidentifythesourcesofstrayradiations.Athoroughanalysisoftheinstrument'sinternalcomponents,suchasoptics,filters,anddetectors,isnecessarytoidentifypotentialsourcesofstrayradiations.Thisinvolvescarefulinspectionandtestingofeachcomponenttoassesstheircontributiontothestrayradiations. 4.CalibrationTechniques Toeliminateorminimizetheimpactofinternalstrayradiations,calibrationtechniquesareemployed.Thesetechniquesinvolvetheimplementationofsuitablecorrectionstothemeasureddat