海洋目标的HY-2A卫星微波散射计在轨辐射定标研究-论文.pdf

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1、1007—4619(2014)05—1072—15JournalofRemoteSensing遥感学报In．orbitradiometriccalibrationoftheHY-2AmicrowavescatterometerthroughopenoceanmeasurementsMUBo，SONGQingtaoNationalSatelliteOceanApplicationService，Beijing100081，ChinaAbstract：Themicrowavescatterometer

2、onboardHY一2Aoceansatelliteprimarilymeasuressurfacewindspeedanddire：ctionovertheglobaloceans．Aprecisein．orbitradiometriccalibrationofthescatterometeriscrucialtoaccuratelymeasurebothwindspeedanddirection．Thisstudyisthefirsttoperformthein—orbitradiometri

3、ccalibrationoftheseawindsscatterometerontheQuikSCATspacecraftbyusingglobalopenoceanbacksca~ermeasurements．Theoceancalibrationmethodisanalyzedanddiscussedonthebasisoftheresultofweawindsthatwaspreciselycalibrated．Resultsshowthattheaccuracyoftheoceancali

4、brationmethodisapproximatelyO．15dBf0raspecificGeographicModelFunction(GMF)．ThedeviationamongdiferentGMFsinoceancalibrationiscausedbysystematicbias．TheGMFmustbeaccurateenoughtorealizetheabsolutecalibrationofthescatterometer．Thecali—brationmethodandresu

5、ltsfromseawindsareusedasabasistoimplementtheradiometriccalibrationoftheHY一2AmicrowavescatterometerOurresultssuggestthatthecalibrationcoeficientsfortheHY一2Amicrowavescatterometerare一1．79dBforVVpolarizationand一1．73dBforHHpolarization．Thewindvectorsofthe

6、HY一2AmicrowavescatterometerarealsovalidatedbywindobservationsfromNDBCoceanbuoys．111eaccuracyofretrievingwindspeedanddirectionissignificantlyimprovedafterapplyingtheobtainedcalibrationcoeficients．Keywords：microwavescatterometer，radiometriccalibration，o

7、ceancalibration，geophysicalmode1functionCLCnumber：TP732．1脚9Documentcode：ACitationformat：MuBandSongQT．2014．In-orbitradiometriecalibrationoftheHY-2Amicrowavescatterometerthroughopenoceanmeasurements．JournalofRemoteSensing，18(5)：1072-1086[DOI：10．11834／jr

8、s．20143174]1INTRoDUCTIoNthein—orbitradiometriccalibrationofscanerometersandtodetectsuddeninstrumentanomalieswitl1inashorttimeperiodSpacebomemicrowavescatterometersmeasurewindspeedfStoffe1en．1999)．anddirectionovertheoceanusingthenormalizedradar