机车顶多部天线布局带来的互耦效应研究

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1、扫舻’’I气。瑰毒●心量p‘^，-K’一●u弧’b≯’·珈．tABSTRACTABSTRACT：High-speedpassengertransportationisthecommontrendofworld’Srailwaydevelopment．EMUisprovidingUSthefastandcomfortablewaytotravel．Atthesametimethesecurityissueinhigh—speednmningstatehasbeenatopicconcernedbypeopleforalongtime．

2、Besidestheexisting450MHzradioandGPSvehiclesatellitepositioningsystem，theCTCS一3levelTrainControlSystemwhosecoreistheGSM—Rwirelesscommunicationsystemhasbeenappliedtotheleomotive．Theremustbemultipleantennascoexistingonthetopoflocomotive．Becauseofcoupling，thereiselectromag

3、neticinterferenceamongAntennas．Ifwedonotsolvethecouplingproblemofantennas，theproperworkofthelocomotivesystemmaybeimpacted．Whatismore，therewillbeserioushiddendangerinroadsafety．Vehicleantennaworksintheopenbutveryfinitespaceenvironment，theusualspatialisolationandshieldin

4、gtechniquescannotbeusedtorestrainantennainterference，andareasonablelayoutoftheantennaistheeffectivewaytoreducethemutualcouplingbetweenantennas．Inthispaper,combiningthepreviousresearchaboutantennasystemsofvehicleandaeroplanerecently,asimpleantennasystemmodelhasbeensetup

5、first．Thatisasystemcomposedofafiniteandmetallicrectanglewhichismultipleantennaslaidon．Thenlinkingtheeffectbetweentheantennaperformanceandactualcircumstanceonthetopoflocomotive，refinethemodel．Thinkingovertheinfluenceoftheobstacleandusingthecouplingastheoptimizedparamete

6、rs，theobjectivefunctionhasbeenproposed．BasedonMatlabhigh-levellanguage，theoptimizedlayoutoflocomotiveantennashasbeengivenbygeneticalgorithms．Itprovidesatheoreticalguidancefortheactuallayoutofthelocomotiveantennas．Furthermore，thehybridofhigh—frequency—computingwayandmet

7、hodofmomentshasbeenusedtosimulatetheantennaonthelocomotiveroof．Concretelyanalysesincludinghowthebody，edgeeffects，barrierblock，catenary、groundand．otherf．actorsimpacttheantennaperformance．Alargenumberofcouplingsimulationshavebeencarriedoutwhichisabouttheanteriorlyoptimiz

8、edandoptimizedlayoutoftheantennas．Anditverifiesthegeneticalgorithmisacorrectandeffectivewaytooptimizethelayoutofanten