用波導模理論研究蒸發(fā)波導對雷達探測的影響.pdf

1、武漢理工大學碩士學位論文用波導模理論研究蒸發(fā)波導對雷達探測的影響姓名：鐘淼申請學位級別：碩士專業(yè)：無線電物理指導教師：劉成國20091201武漢理工大學碩十學位論文AbstractAtmosphericductcanguideradiowavestodistancesfarbeyondthehorizonwithlessattenuation，whichwillhaveasignificantimpactonthespreadofrad

2、iosignalsForthecornrnunicationcircuittheproblemsoftheCOchannelinterferencearemorecomplicate；Forthecaseofdetectivesystem，atmosphericductcanincreasetheerrorofradarranging，directionfindingandvelocitymeasuring，enhanceradarcl

3、utterextenddetectionrangeandenlargethedetectiveblindzoneSotheresearchesonthecharacteristiesoftroposphericductsenvironmentpropagationanditsapplicationshavegreattheoreticalsignificanceanditsapplicationshavegreattheoretical

4、significanceandareofgreatvaluetomilitaryThisPapermakeusedofmodaltheorytoStudywavefielddistributionproblemsandradardetectionproblemintheatmosphericductFirstlythemodaltheoryaredescribedandmakeadetailedtheoreticalderivation

5、ofthewaveguidemodaltheorystatingthekeyalgorithmofthewavegnidemodaltheoryandpresentingnumericalproceduresforwaveguidemodalprocessesanditsimportantpartThefielddistributionofafrequency520MHzradiowaveareanalysisedandcompared

6、withtheexperimentaldataobtainedthemaximumerroris10dB，theaverageerrorisabout2dBThecharacteristiesof仃ansmissionlossaresimulatedintheatmosphericductbyusingthemodaltheoryFinallytheperformanceofradardetectioninpresenceofatmos

7、phericwaveguideisdiscussedForonething，thebasicformulaofradardetectioniSintroducedandthenderiveradardistanceformulainpresenceofatmosphericwaveguideModeldistanceofradardetectioninatmosphericwaveguideusingthemodaltheoryResu

8、ltsindicatethatmodaltheoryiSgoodatcalculatetheradiowavepropagationlossintheseasurfaceatthelastshowtheperformanceofradardetectioninpresenceofatmosphericwaveguide，andsomeresults：(1)theradarhasabeyondthehorizondetectioncapa

9、bilityinpresenceofatmosphericwaveguide，sometimesmaximumdetectionrangeofuptohundredsofkilometers；(2)theradardetectionoftheregionalapparentshadowatthetopofthewaveguideinpresenceofatmosphericwaveguide，、Mththeenhancedevapora