星载扇形波束扫描微波散射计在轨定标方法研究的中期报告.docx

星载扇形波束扫描微波散射计在轨定标方法研究的中期报告
Abstract:
Thismidtermreportpresentstheprogressofourresearchonin-orbitcalibrationmethodsforthespaceborneconical-scanningmicrowavescatterometer.Thescatterometerisdesignedtomeasureoceansurfacewindsandotherrelatedparametersandiscurrentlyinorbitonasatellite.Duetothechangingenvironmentofspace,thecalibrationoftheinstrumentisaconstantchallenge.Inthisstudy,wefocusontheuseofreferencetargetsonthegroundandtheonboardbiasmonitoringsystemtocalibratethescatterometerinorbit.Wepresentthepreliminaryanalysisofdatacollectedfromthesetwocalibrationmethodsanddiscusstheireffectivenessinimprovingtheaccuracyofthescatterometermeasurements.
Introduction:
Thespaceborneconical-scanningmicrowavescatterometerisacomplexinstrumentdesignedtomeasureoceansurfacewindsandotherrelatedparameters.Thisinstrumenthasbeenusedonseveralsatellitesandhasprovidedvaluabledatatothescientificcommunity.However,inordertomaintaintheaccuracyandreliabilityofthemeasurements,regularcalibrationisnecessary.
Inthisstudy,weinvestigatetwomethodsofcalibration:theuseofreferencetargetsonthegroundandtheonboardbiasmonitoringsystem.Groundtargetsareusedtoprovideastablereferenceforthescatterometer,whilethebiasmonitoringsystemisusedtotrackchangesintheinstrumentovertime.
Methods:
Thereferencetargetsusedinthisstudyarelocatedonthegroundandaremadeupofvariousmaterials,suchasconcrete,metal,andvegetation.Thesetargetswerechosenbasedontheirreflectivityatthescatterometer'soperatingfrequency,andtheirstabilityovertime.Thescatterometerwaspointedatthesetargetsduringitsorbitandthedatacollectedwasusedtocalibratetheinstrument.
Theonboardbiasmonitoringsystemisdesignedtotrackchangesintheinstrument'sperformanceovertime.Thissystemoperatesbymeasuringtheresponseoftheinstrumenttoaconstantinputsignal.Anydeviationfromtheexpectedresponseisanindicationofachangeintheinstrument'sperformance.Thisinformationcanbeusedtoadjustthecalibrationoftheinstrument.
Results:
Preliminaryanalysisofthedatacollectedfromthegroundtargetsandonboardbiasmonitoringsy