采用Simulink实现超外差接收系统的动态仿真

:2002-09-282012200312:1006-9348(2003)12-0035-03Simulink,(,266041):MATLABSimulink,,,Simulink:;;:TP391.9:A1,,MATLAB,2SimulinkSimulinkMATLAB,MATLAB,,,3Simulink311,v=V0(1+Macost)cos0tv1=Avvv2=v1Acos1t-A/2AvV0(1+Macost)cos(0+1)t=A/2AvV0(1+Macost)cos(1-0)tv3=Av1v2v4=v3/cos(1-0)t=A/2AvAv1V0(1+Macost)v5=Av2(v4-A/2AvAv1V0)=A/2AvAv1Av2V0Macost,,,,Simulink312,,,,1-0465KHz,01.76MHz,12.1656.465MHz,kHz,:=6KHz,0=1.7MHz,1=2.165MHz:Av=2,Av1=2,Av2=2:V0=3,A=2,Ma=1/3,0,1-0,,,:=1Hz,0=15Hz,1=20Hz,Av=Av1=Av2=2,A=2,V0=3,Ma=1/31Simulink532313,Simulink,SimulinkSimulink,Sourse,:,/2,,,/Sum/Product,Math,Sum-;,Product/,SinksScope,,,,Simulink(1)4,,SimulinkParameters,,04,1/1023,ode5,,1/1023,,ode,5,,,,,Scope2,,Simulink563,MATLABSimulink,Simulink,:[1].[M].,1990-9.[2].MATLAB5.3[M].,2000-8.[3],.MATLAB[M].,2001-1.[4].[M].,1994-10.[5],.[M].,1991-5.[6]DHanselman,BLittlefield.MasteringMATLAB5[M].PrenticeHall,NewJersey,1998.[](1975-),(),,,1998,;(1971-),(),,,1995UsingSimulinktoRealizeDynamicSimulationofSuperheterodyneReceivingSystemLIJin-jie,ZHANGYong-shun(NavalAeronauticalEngineeringAcademyQingDaoBranch,QingdaoShandong266041,China)ABSTRACT:Inthispaper,withsimulinksoftwarebundleinMatlab,dynamicsimulationofsuperheterodynereceiversincommunicationsys2temisaccomplished,andwholesimulatedresultispresented.Thebasicmethodandstepusingsimulinktorealizedynamicsimulationissum2marized.KEYWORDS:Communication;Superheterodynereceivingsystem;Dynamicsimulation(97):[1]ZHWei,PQinandYQFu.PerceptualDigitalwatermarkofimagesusingwavelettransform[J].IEEE1998.[2].[M].:,1999.[3].[J].,1999,(6).[](1971.12-),(),,,,;(1963-),(),,,,;(1973.11-),(),,,AMethodofWatermarkBasedonWaveletMultiresolutionYANGXiao-qiang,WANGBao-bao,DINGBin(SchoolofComputer,XiDianUniv,XianShanxi710071,China)ABSTRACT:Inthispaper,anewmethodofdigitalwatermarkisproposed,basedonwaveletmultiresolution.Thewatermarkisprocessedasabinaryimage.Withoutresortingtotheoriginalimage,itiseasyandreliabletoextractthewatermark.Theexperimentalresultsshowthemethodcansurviveimagecroppingandimagecompression,andtheembededwatermarkisrobust.KEYWORDS:Digitalwatermark;Wavelettransform;Imageprocessing73