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1、2010InternationalConferenceonElectricalandControlEngineeringSoftwareDevelopmentontheEstablishmentofLocalMarineGeomagneticFiledModelShengpingWang,JianhuZhao,AixueWangKunYang,ChunheTianSchoolofGeodesyandGeomatics,WuhanUniversityTianjinResearchInstituteForWaterTransportEnginering.Luoyuroad
2、129,Wuhancity,China37#,XingangroadNo.2,Tanggu,Tianjin,China37452116@163.comjhzhao@sgg.whu.edu.cnAbstract—Geomagneticfieldistheoneoftheinherentphysicalmaycausegreatfluctuation.Thus,noiseorabnormalrecordscharacteristicsoftheearth.Forearthquakepredictiontooftenaccompanieswithgeomagneticobs
3、ervation.Inordertoindependentnavigationortootherapplications,localreflecttheactualgeomagneticfield,itbecomesverynecessarygeomagneticmodelplaysaveryimportantrole.Inordertotoeliminatethegrosserroringeomagneticobservationandcontroltheperformanceofthelocalgeomagneticfieldmodel,theensuretheq
4、ualityofgeomagneticdatabeforetheconstructionmethodslikepolynomial,polyhedralfunction,splinefunction,ofgeomagneticfieldmodel.Twotechniques,trend-surfacerectangularharmonicanalysisandsphericalcapharmonicarediscussedindetailinthispaper.Integratedthesemethods,afilterandrobustM-estimatefilte
5、r,areusedfortheworkinthesoftwareontheestablishmentoflocalgeomagneticfieldmodelissoftwaresystem.developed.Thesoftwareistestedinalocalarea.TheexperimentTrend-surfacefilterbasesontheregressionanalysisshowsthatthesoftwaredesignisreasonable,themethodsusedintechnology.Onceasuitableordernumber
6、ofthepolynomialthesoftwareareright,andtheaccuracyofestablishinglocalmodelisgiven,acorrespondingfittingsurfacecanbegeomagneticfieldmodelishigherandcanmeet5nThigh-preciseestablishedwiththerawdata.Experimentsshowthatitisrequirements.enoughtoadopt3-orderpolynomialmodeland4-timestandarddevia
7、tionasthethresholdinthegeomagneticdataKeywords-Softwaredevelopment;localgeomagneticfieldfiltering.Theseparametersguaranteenoiseorabnormalmodeling;requirmentanalysis;softwaretestingrecordscanbeeliminatedeffectively.GeomagneticdatafilteringcanberealizedbyrobustM-I.INTRODUCTIONest
