通信系统无源非线性引起的互调干扰(2)

:2003208210:(60371018):(1961),,,,.:167224291(2004)01200582051,2,1(1,710071;2,710086):,.,.,,.:;;;:TN91411:AIntermodulationinterferenceduetopassivenonlinearityincommunicationsystemsZHANGShi2quan1,2,GEDe2biao1(1CollegeofScience,XidianUniversity,Xian710071,Shaanxi,China;2SectionofPhysics,ArmedPoliceInstituteofEngineering,Xian710086,Shaanxi,China)Abstract:Anoverviewonthebasictheory,thegenerationmechanism,themitigationmeasureandtheanalysisandmodelingofpassiveintermodulation(PIM)interferenceincommunicationsystemsisgiven.ThedetectingandlocatingmethodsandthemeasurementofPIMinterferencearediscussed.ItisindicatedthatPIMproductsareimportantinterferencesourceinmulti2carriercommunicationsystemsandpassivenonlinearityincludingcontactnonlinearityandmaterialnonlinearityistheessentialoriginofsuchinterference.PresentanalysisandcalculationmethodsforPIMarelimitedtopowerseriesmethod.AtfurtherstudyattentionsshouldbepaidtotheestablishmentofthephysicalmodelofpassivenonlinearityandmoreefficientmethodsforpredictingtheamplitudeofhigherorderPIMproductswiththatoflowerorderproductswhichcanbemeasuredmoreeasily.Keywords:communicationsystems;nonlinearity;passiveintermodulation;interference,,.,.,3:(1),;(2),;(3).[13],.,(PIM),.,321()Vol.32No.120043JournalofShaanxiNormalUniversity(NaturalScienceEdition)Mar.2004.,PIM.70,,.,.,,[47].,.1(),.,,,f1f2,Ui=U1cos(2f1t)+U2cos(2f2t),(1)Ui,U1U2.n:U0=a1Ui+a2U2i++anUni.(2)U0,a1,a2,,an.(1)(2),U0.:fim=mf1+nf2.(3)m,n,,(|m|+|n|).U0,.,PIM.,PIM.,PIM1.2,.PIM,:.1Fig.1Relationshipbetweennumberofintermodulationproductsandnumberofchannelsa.;b.[8],;,.2.1PIMPIM7:(1);(2);(3);(4);(5);(6);(7).2.2PIMPIM:(1).10nm,;(2).(),,,PIM;(3).;(4).,PIM;(5).;(6).;(7).,;1:59(8).,;(9).,;(10).,.,,;(11).(),.RF,,;(12).,;(13)..,.,;(14).,;(15)...3,.PIM[911]:(1),,,;(2)();(3)PIMPIM,;(4),;(5),,;(6),;(7).,;(8),;(9);(10),,;(11),PIM,;(12),PIM.,.,,.4,,.[12].[13].[14],.Boyhan[7]PIMPIM,PIMPIM,PIM.[1519].5,,,[20,21],.,:,;,.,60()32[2225].[22,23].,[24],,..,.,,,;(),.,.,,,.[25].2.VHF3.,().,.,.,..,..,.,.,,.,,.,.2Fig.2Atestset2upofpassiveintermodulation6,,,.,:(1);(2);(3);(4);(5),..,,,.:[1]ShimboO.EffectsofintermodulationAM2PMconversionandaddictivenoiseinmulticarrierTWTsystems[J].ProceedingsofIEEE,1971,59(2):230238.[2]RichardBSwordlow.Analysisofintermodulationnoisein1:61frequencyconvertersbyVolterraseries[J].IEEETransonMTT,1978,26(4):305313.[3]MuhammadTaher,Abuelmaatti.Carrierandinter2modulationperformanceoflimitersexcitedbymulticarriers[J].IEEETransonAerospaceandElectronicSystems,1994,30(3):650659.[4]HelmeBGM.PassiveintermodulationofICTcomponents[A].IEEColloquiumonScreeningEffectivenessMeasurements[C].London:Springer2Verlag,1998.18.[5]BoyhanJW,LenzingHE,KoduruC.Satellitepassiveintermodulation:Systemsconsiderations[J].IEEETransonAerospaceandElectronicSystems,1996,32(3):10581064.[6]LiuPL.Passiveintermodulationinterferenceincommunicationsystems[J].IEEElectronicsandCommunicationEngineeringJounal,1990,2(3):109118.[7]BoyhanJW.RatioofGaussIanPIMtotwo2carrierPIM[J].IEEETransonAerospaceandElectronicSystems,2000,36(4):13361342.[8]FarrokhArazm,FrankABenson.Nonlinearitiesinmetalcontactsatmicrowavefrequencies[J].IEEETransonEMC,1980,22(3):142149.[9]HoPO,WilkinsonWS,TseungAC.Thesuppressionofintermodulationproductgenerationinmaterialsandstructuresusedinradiocommunications[A].IEEelectronicsdivisioncolloquiumonpassiveintermodulationproductsandrelatedstructures[C].London:Springer2Verlag,1989.5/15/5.[10]HallWJ,GibsonMH,KunesMA.Thecontrolofpassiveintermodulationproductsinspacecraftantennas[A].IEEelectronicsdivisioncolloquiumonpassiveintermodulationproductsandrelatedstructures[C].London:Springer2Verlag,1989.2126.[11]BrownAK.Passiveintermodulationproductsinantennas2anoverview[A].IEEelectronicsdivisioncolloquiumonpassiveintermodulationproductsandrelatedstructures[C].London:Springer2Verlag,1989.1/11/3.[12]KaiYEng,ThomasEStern.Theorder2and2typepredictionproblemarisingfrompassiveintermodulationinterferenceincommunicationssatellites[J].IEEETransonComm,1981,29(5):549555.[13]KaiYEng,On2ChinaYue.High2orderintermodulationeffectsindigitalsatellitechannels[J].IEEETransonAerospaceandElectronicSystems,1981,17(3):438445.[14]SarkozyZA.Intermodulationanalysisofpassivecomponentsincommunicationsatellites[A].AIAA/CASI6thcommunicationssatellitesystemsconference[C].Montreal:Springer2Verlag,1976.337355.[15],,.[J].,2002,29(3):404407.[16]SeaRG.Analgebraicformulaforamplitudesofintermodulationproductsinvolvinganarbitrarynumberoffrequencies[J].ProceedingsoftheIEEE,1968,56(8):13881389.[17]SeaRG.Onthecomputationofintermodulationproductsforapowerseriesnonlinearity[J].ProceedingsoftheIEEE,1969,57(3):337338.[18]ChapmanRC,RootseyJV,PolidiI.HiddenthreatmulticarrierpassivecomponentIMgeneration[A].AIAA6thcommunicationssatellitesystemsconference[C].Montreal:Springer2Verlag,1976.19.[19]RiddleLP.Two2toneintermodulationanalysisofcommunicationsatellitetransponders[A].IEEE1985Internationalcommunication[C].Chicago:Springer2Verlag,1985.218221.[20]WilliamGD,SavageJW.DetectingandlocatingsourcesofintermodulationinterferenceIEEE[A].