GPS信号捕获性能的分析

2410SystemsEngineeringandElectronicsVol124,No1102002:2001-10-12:2002-02-25::(1972-),,,,,:1001O506X(2002)10O0073O03GPS,,(,410073):GPS,GPS,,GPS:;;:TN957:AAnalysisoftheSignalAcquisitionPerformanceoftheGPSZHANGWen2ming,ZHOUYi2yu,JIANGWen2li(InstituteofElectronicScienceandEngineering,NUDT,Changsha410073,China)Abstract:InthispapertheGPSperformanceforsignalacquisitiontimeanddetectionprobabilityisanalyzedonthebasisoftheprincipleofGPSsignalacquisition.Therelationshipofacquisitionperformanceversuscarrier2to2noiseratioandintegrationtimeisgiv2en.TheacquisitionperformanceofaGPSreceiverwhichadoptshighaccuracyclockandmulti2correlatortechnologyisalsoanalysed.Thesimulationresultshowsthattheadvancedacquisitiontechnologyisimportant.Keywords:Globalpositionsystem;Acquisition;Navigation1(globalpositionsystem,GPS),GPS,(C/A),C/A;,(P(Y)),,,,GPS,2GPSGPSGPS()NBINS=FPft(1)F,;P,;fp,p1/2()1,,,TC(),I(kTC)Q(kTC)Ik=kTC(k-1)TCI(t)dt,Qk=kTC(k-1)TCQ(t)dt(2)TC,NNC(I2+Q2),,TC,TCGPS,,(4)(5)(CNT)PFAPMDz=NNCk=1I2k+Q2k(3)PFA=Prob(z2n|CN0=0)=Q(|2NNC)=1-P(|2NNC)(4)PMD=Prob(z2n|CN0=CNT)=P(|2NNC,NNCCNT)(5)PFAPMD2P(|2NNC)2P(|2NNC,),2NNC,=NNCCNT,NNC;;2n3GPS311,NNC[1]NNCµ2ln14PFA+ln14PD(1-PD)1+22(6)NNCTC,2(a)0195010001NNCTCC/N=/TC(6),,Pd=1216-16102NNC/-ln1/(4PFA)1+22(7)2(b)2(d)(7)TC,C/NTCNNC,,TC()2312(f)01442/TC3dB[2],f=01442/TC3112104Hz,31kHz(),TC20ms(GPS),545C/A1023,2046,,C/A,C/A,2046P(Y)21014,C/A31ms,330000m(),341123,P(Y)2124107,P(Y)GPS[3]Tacq=1/2NBINSNNCTCNBINS,1/2,Tacq=2-PD2PD[kpPFA+1]NBINSNNCTC(8)kp=v/(NNCTC);v,NNCTC,kp1kp=10,PFA=10-4,PD=01953(a)Tsearch/NBINSC/NTC,GPSMMTacqµ1/2NBINSNNCTC/M(9)M472002Tacq=2-PDPD{[kp(1-(1-PFA)M]+1}NBINSNNCTC/M(10),3(b)PD=0195TC=1ms,Tacq/NBINSC/N,3313GPSJeq=N0RC+1QC(11)NJ=Jeq/RC(12)=STCN0+NJTCRCQCJ/S(13)(11)N0;J;Jeq;RC;QC,1,()115,()2,(13)GPS31ms/10kHz,3100ms/2kHzGPS150(GPSMAGR)1000(E-MAGR)(13)(10)(6),,RC70dB(P(Y)),TC1ms4P(Y)4(a);4(b),,,1000,50dB,104,GPS,,104,10244GPS,GPS,GPS,,GPS(1),,;(2),;(3),,,,2:[1]LozowJB.AnalysisofDirectP(Y)CodeAcquisition[J].Navigation,1997:89-97.[2]AlisonBrown.BenefitsofSoftwareGPSReceiversforEnhancedSignalProcessing[J].GPSSolutions,2000:56-66.[3]AlisonBrown.ApplicationsofDigitalStorageReceiversforEnhancedSignalProcessing[C].IONGPS99,1999:2199-2208.[4]AlisonBrown.DirectP(Y)CodeAcquisitionUsinganElectro2OpticCorrelator[C].Proc.ofIONNationalTechnicalMeet,2001:386-393.[5]AlisonBrown.ModelingandSimulationofGPSUsingSoftwareSignalGenerationandDigitalSignalReconstruction[C].Proc.ofIONNationalTechnicalMeeting,2001:646-652.5710GPS