微波检测路基结构层介电特性试验研究 VIP免费

AbstractAbstractofdissertationshouldbeconciseandclear,withoutcommentandadditionalexplanation.Thecontentshouldincludethepurpose,method,resultandconclusion,etc.,itisindependentandself-containedMicrowaveremotesensingasanimportantmeansofacquiringinformationontheearth'sresourcesandenvironmenthasbeenrapidlydevelopedduetoitsadvancednature.Itisofgreatsignificanceformicrowaveremotesensingmechanismresearchhowtoextracteffectivegroundinformationfrommicrowaveremotesensingdatasources.Microwavedielectricpropertiesofdielectricmaterialsarethemaincontentofmicrowaveremotesensingmechanismresearch,andalsothebasisformicrowaveremotesensingelectromagneticparametersinversion.Thisthesisstudiesthedielectricmicrowaveanddielectricconstantmeasurementmethodsfromboththeoreticalandexperimentalaspects.Firstly,thepaperintroducestherelativetheoreticalknowledgeofmicrowaveremotesensingandsummarizesthedielectricconstantmeasurementmethods.Besides,thewaveguidemethodandthecoaxialprobemethodinthelaboratoryarediscussed.Thewaveguidemethodisanindoormeasurementmethod.Thedielectricconstantofasamplecanbeconvenientlymeasuredthroughtheintroductionofacartridge.Forlow-losssamples,thismeasurementmethodhashighaccuracy.Thecoaxialprobemethodissuitableformeasuringhigh-lossmedia,andisparticularlysuitableforMeasurementofthedielectricconstantofliquidsubstancessuchaswater,brine,andoil.Inadditiontothewaveguidemethodandprobemethod,thepaperfocusesonthefreespacemethod.Thefreespacemethodisoneofthefieldmeasurementmethods.Itissuitableformeasuringthedielectricconstantofalarge-areatarget,andcanperformmeasurementwithoutlossandnon-destruction,andismoresuitableforpracticalapplicationsofmicrowaveremotesensing.Thepaperintroducesthemeasurementprinciple,calibrationandinversionofthepermittivityofthefreespacemethod.Inordertofacilitatethefieldmeasurementandtheactualneedsofmicrowaveremotesensing,thispaperproposesasimplesystemformeasuringthedielectricconstantinthefieldofdielectricconstantmeasurement,andgivesthemeasurementprincipleofthesystem.Itlaysthefoundationfortheoutdoorfielddetection.Thepaperthenintroducesthegroundpenetratingradar,appliesthegroundpenetratingradartechnologytotheroadsurfaceinspection,andcombinestheprevioustheoreticalknowledgeofdielectricconstantmeasurementwithradartechnology.Theantennaselection,parameterselection,indoordataprocessing,anddatainterpretationduringoutdoordataacquisitionareintroduced.Basedonmicrowaveremotesensing,anoutdoortestsystemwasestablished.Groundpenetratingradar,antenna,andnotebookcomputerwereusedtoconducton-the-spotdetection,dataacquisition,datainterpretation,dataprocessing,andsimulationimagingontheroadsurface.Theroadsurfacethicknesscanbequicklyandintuitivelymeasuredascombiningtheoryandactualorganic.Fordataprocessing,Reflexisusedtoperformstaticcorrection(definingthegroundastimezero),1Dfiltering(DCshifting),gain(energyattenuation),2Dfiltering(backgroundremoval),and1Dfiltering.(ButterworthBandpassFiltering)and2DFiltering(SlidingAverage)tovisuallypresenttheroadsidecutandthicknessdata,whichcanbeaccurate,fast,andefficient.KeyWords:Microwaveremotesensing,Dielectricconstant,Waveguidemethod,Freespacemethod,Groundpenetratingradar目录摘要...........................................................................................................................................IAbstract...........................................