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1、THROCKYMOUNTAINSPACEGRANTCONSORTIUM,14ANNUAL,MAY5,20081AlgorithmDevelopmentforColumnWaterVaporRetrievalUsingTheSAMSensorJoshuaWillimas,JohnDeVore,ATStairJr.,andDoranBakerAbstract—Tounderstandandmodeltheenergeticsofthe4)Formulate,test,anddocumenttheimprovedmodelal-Sun-Earthconnection
2、,measurementsofspecificatmosphericgorithm.moleculesarebeneficial.Ourobjectiveistoformulateanal-gorithmtoderivetemporallyvaryingatmosphericwatervaporconcentrationsasafunctionofaltitude,latitude,andlongitudeThroughthesesteps,usingexperimentaldata,anewalgo-fromsolarirradianceabsorptionme
3、asurements.TheVisidynerithmwastestedagainstexistingalgorithms,andthesetestsSAMinstrumentisusedtostudythesizedistributionofclouddemonstratedthemagnitudeofimprovementobtainedthroughparticles.ByintroducingaspectrometertotheSAMinstrument,usingthenewapproach.Uponaccomplishingthis,thead-c
4、olumnwatervaporvaluesareproducedasanadditionaldatavancedalgorithmwastestedtodiscoverunderwhatconditionsproduct.Anewmodelalgorithmwasdevelopedandtestedagainstexistingalgorithms.Throughaleast-squaresanalysis,thenewitproducesthemostaccurateresults.Bothofthesetestswerealgorithmshowedani
5、mprovementofafactorofupto23overtheconductedusingaleast-squaresapproach.Byminimizingtheindustrystandard.Atestwasalsoconductedtoascertainwhicherroramodelalgorithmunderappropriateconstraintswaswaterabsorptionbandpassproducestheleasterror.Throughformulated.Thisdevelopmentprovidedareliab
6、ledatasettothesetestsanimprovedmodelalgorithmhasbeenproduced.ascertainthedistributionanddynamicsofcolumnwatervapor,andinturnfurthertheunderstandingofclimatechangetrends.I.INTRODUCTIONHEVisidyneSAM(SunandAureoleMeasurement)Tinstrumentationsystemisdesignedtomeasuretheab-sorptionandsca
7、tteringofsunlightattributabletoH2OintheEarth’satmosphere.ForSAMtomeasuresolaraureoles,theII.ALGORITHMDEVELOPMENTinstrumentemploysaSuntrackerplatformthatdirectstheunscatteredsunlightintoablackenedcavitylocatedintheinstrument.Thisiscalledthebeamdump.Inordertomeasuretheabsorptionofsunl
8、ightattributabletoH