软件锁相环的设计与应用

281Vol.28,.120071JournalofTelemetry,Tracking,andCommandJanuary20071,2,1,1(1101416261226100058):2006203230:2006207214:,,,,:;;;;:TN911.8:A:CN11-1780(2007)01-0010-05,DSPFPGA(CPU),GPS,[13],,[4],[5],,,,,,,1,[5]s1[6]s=2T1-z-11+z-1(1)1s,T,12Knn=K1=22K1(2)K=KdK0,Kd,K0,2z1,2(1)(2),2zz,1.13(a)(b),,,,;arcsin,3I/Q,,Catan2(),I/Qui(nT)=Uisin[0nT+1(nT)](3)zd(z)=1(z)-2(z)(4)3(b),udI(nT)=LPF[ui(nT)uoI(nT)]=AUiU0sin[1(nT)-2(nT)](5)udQ(nT)=LPF[ui(nT)uoQ(nT)]=AUiU0cos[1(nT)-2(nT)](6)d(nT)=arctan2[udI(nT)/udQ(nT)]=1(nT)-2(nT)(7),LPF1.2(IIR),zuc(nT)=uc[(n-1)T]+2n+T2d(nT)-2n-T2d(n-1)T(8)1.3z,2(nT)=2(n-1)T+2nT2uc(nT)+2nT2uc(n-1)T(9)(9)2(nT)=2(0)+2nT2nk=1uc(kT)+2nT2n-1k=0uc(kT)(10),11281,2nT2nk=1uc(kT)2nT2n-1k=0uc(kT)(11),(10)2(nT)=2(0)+2nTnk=1uc(kT)(12),u0(nT)=U0cos[0nT+2(nT)]=U0cos[0nT+2(0)+2nTnk=1uc(kT)](13),2nT,(Hz)2nuc(nT)/22n,,,,,nn,,,VCO,,,;n,,,,[7],,=0.5,0.61=0.707,nmax(),,[8],max2n,nmax1.414=0.707max|H(j)|=1+42x2(1-x2)2+42x2(14),x=/n,=0.707,|H(j)|2=0.5c=2.06n,[9],c=2.06ni_min(i_min),n0.485i_min,n(0.707max,0.485i_min),n;,n,,3,70MHz,10kHz,16.5MHz,0.707(S/N=30dB)4t=110-4s,5t=310-5s,,n(S/N=10dB),fn=30kHz,,(BL0.53n),721200714S/N=30dB,fn=8kHz5S/N=30dB,fn=30kHz,fn=8kHz,,(7),,n6S/N=10dB,fn=8kHz7S/N=10dB,fn=30kHz4SSTTC70MHz3MHz,16Msps(8bit),:,16Msps3MHz,(D=2),,N=20FIR,FIR1.5MHz,1.5,N=22IQ,FIR,CPU(SIMD),CPU[10](C),100ms,IntelXeon3.0GHz,280ms,8,31281,,8USB5,,,,,[1]GrydelandT,LindFD,EricksonPJ,HoltJM.SoftwareRadarSignalProcessing[J].EuropeanGe2osciencesUnion2004.[2]SchamusJohnJ,Real-TimeSoftwareGPSReceiver[J].IONGPS2002,2427.[3].[N].,A6,2005:3.10.[4]BoseV,IsmertM,WelbornM,GuttagJ.VirtualRadiosIEEE/JSAC,SpecialIssueonSoftwareRadios,17(4):591602.[5]MarkA.Wickert.Phase-LockedLoopswithApplication[M]ECELectureNotes.Fall2004.[6][]A.V.,R.W.,J.R..[M].:,2001.[7].[J].,1997(26)12:1620.[8].[M].:,1990.[9],,.[M].:,1994.[10]IA-32IntelArchitectureSoftwaredevelopersManual.:AccordingtothecharacteristicsoftheVirtualRadiotechnologyandthebasictheoryofthePhaseLookLoop(PLL),thispaperputsforwardthemathematicalmodelofthePLLwhichissuitableforsoftwarerealizationbythecomputer.Inthispaper,theinfluencesoftheparameterstothecaptureperformanceandthetrackingperformanceareanalyzed,andthebasicprincipleoftheparametersettingindifferentconditionsisgiven.TheresultsofthesimulationprovethatthecaptureperformanceandthetrackingperformanceofSoftwarePLLinAdditiveWhiteGaussianNoisearegood.Atthelastofthepaper,theoptimizedmethodofthePLLsignalreal2timeprocessingintheTracking,TelemeteringandControlSystemispresented.Keywords:Virtualradio;SoftwarePLL;Phasedetector;Loopfilter;Voltagecontroloscillator[]1982,,.1978,,1980,,4120071