短波跳频通信中自适应选频系统的研究和设计

上海交通大学硕士学位论文短波跳频通信中自适应选频系统的研究和设计姓名：于博文申请学位级别：硕士专业：电磁场与微波技术指导教师：黎滨洪200501012200511834RTCERealTimeChannelEvaluationRTCE512345DSP6AbstractFrequency-Hoppingisamainformofspreadspectrumcommunication,adaptstoworkunderthesituationofshort-wave,especiallyisusedtomilitarybroadcastingstations.Atthesametime,thecharactersofshort-wavechannel,suchasasymmetryandtimechanging,canresultinpenetratingionosphereorbeingabsorbedbyionosphere.Theadaptivefrequencyselectiontechnologycanconquerdeclinecausedbymulti-path,improvethequalityofcommunication,efficiencyofavailablefrequency.High-speedandexactadaptivefrequencyselectionsystemcanfittherequestofshort-wavefrequency-hoppingcommunication,e.g,realtimeandhighquality,tosupplymilitaryandcivilshort-wavecommunicationwithtrustyandhigh-speedmechanismoffrequencyselection.Thefrequencyoftraditionalshort-waveradiocommunicationisselectedbymanpower,thismethodneedsmoreexperienceofoperators,thelowefficiencyrestrictsthequalityofcommunicationandtheabroaduseofshort-wavecommunication.TheadaptivefrequencyselectionmechanismsuchasearlyCURTSdetectionandupperChirpdetectionhavemoreadvantages,butthesedetectionmechanismsareequipment-independent,theequipmentofthemistoobigandexpensive,sotheycannotbewidelyusedinshort-wavecommunicationcircuits.Inourcountry,theresearchofshort-wavecommunicationcan7updatethemilitaryshort-wavecommunicationequipmentsquicklytorealizethemightinessofnationaldefence,short-wavecommunicationsystemimprovedbymoderntechnologycanalsosupplycheapcommunicationlinkwithhighqualityandavailabilityforcivilusers.Asaresult,theresearchofshort-wavecommunicationisveryimportantinpractice.RTCERealTimeChannelEvaluationtechnologyisthekeytechnologyofadaptivecommunicationsystem,theresearchonfastandtrustyRTCEtechnologyandit’scorrespondingadaptivefrequencyselectionsystemisveryimportantandvaluable.Thispaperhasgatheredmoresummarizationandinformation,researchedontheoryandarithmetic,themainworkofthispaperincludes:(1)Researchonfactorsaffectingqualityofshort-wavecommunication,includingnoise,Dopplerbroadening,multi-pathtimedelay,etc.(2)Comparetheperformancebetweendifferentadaptivefrequencyselectionsystem,andtheperformancebetweendifferentarithmetic.(3)Researchonthestructure,parameters,protocolsofadaptivefrequencyselectionsystem.(4)Researchontheanalyticalmethodsoflinkqualityof8adaptivefrequencyselectionadaptingtoacertainshort-wavefrequency-hoppingcommunicationsystem.(5)Realizeanappliedmechanismwithdigitalsignalprocessingtechnologyandhigh-speedfixedpointDSPchip.Thispaperimprovestheestimationmethodofchannelqualityusedintraditionalvoicebandwidthconsideringtheparametersofanewshort-wavefrequency-hoppingandspreadspectrumcommunicationsystem,thesimulationoncomputertestifiedthecorrectnessandpracticabilityofthisimprovedmethod.Atthesametime,thispaperrealizedandtestifiedthefunctionsofadaptivefrequencyselectionsystemaccordingwiththerequestofthemilitaryprotocol.KEYWORDSshort-wavefrequency-hoppingadaptivefrequencyselectionestimationofchannelquality111.13MHz-30MHz100-10m[2][2]-1.2[2]4000km121.3[2]1234513130/s100/s/s500/s23100kHz~1kHz4561.4[2]--14[2][2]1RTCE[2]RTCE(RealTimeChannelEvaluation)RTCERTCERTCERTCE115234\2[2]FFT3[2]164[2]ChirpAutolinkChirp10000Autolink50Don.O.Weddle17241.5RTCE2060CURTS10min70BARRY80RTCE70CURTSCHECCHIRPSELSCANALQAAUTOLINKRTCE1-21018RTCE1.6RTCE25KHz2.4kbit/sMDDMSNRALESNRGJB2077-94/SNR192.12.1.1DEF[4]D60km~90km80kmDDDDDEFDDD2MHz~5MHz1000km[4]E100km~120km110kmDEEEsE120kmEE[4]FFFFF1F2F1F20170km~220km2F225km~450km2F[4]2.1.2[3][4][2]MUFMUFF21MN2~485%3245[2]0.5ms99.5%2.4ms50%5ms0.5%22[2][4]a)300Hz400Hzb)c)10/min~20/min40dB80dB4ms~20msD1231210dBXD101h[2]fΔ1Hz~2Hz6Hz1Hz~6Hz[2]24fnftotΔ=Δ2.1nfΔtotfΔxtytyfxf1Hz10Hz40Hz0.13s2-1300km25[3]2-1Figure2-1theareaofantennawithnodirectionwhereshort-wavecannotspread2.2-MD[2]263db[2]12345273.18891190%234Es562FCCIR430HFHF28DarnellDarnell1234RTCERTCE293.2RECERTCEEM30MDSNRSNRMDChirpA/DChirpFMCWChirpCHECChirpCHECCHEC31RTCERTCEP.A.BelloMFSK8FSK125baud3kHz7501000125015001750200022502500HzSNRBERMALE70CURTSCHECCHIRPSELSCANALQAAUTOLINKRTCElCURTSIBM1212323lCHECCURTSCHEClCHIRPBerry4000Km1234lSELSCANALQA1984ALQADSP1SNOR2FD345679~26lAUTOLINKHFHARRIS19851HF23334567S/N10722CURTSHFRTCE344.1chirp4.1.1MDSNRBERMDMDPBelloMD[5]HFPvDQuM[7]212)()()(2⎥⎥⎦⎤⎢⎢⎣⎡-=∫∫dvvPdvvPvvD4.1212)()()(2⎥⎥⎦⎤⎢⎢⎣⎡-=∫∫duuQduuQuuM4.235∫∫=dvvPdvvvPv)()(∫∫=duuQduuuQu)()(4.3PvQuPvQuDMPerlFFTFFTDM[6]f0fi=f0+iFFSt0101()()()()cos(2)cos(2)cos(2)iiStStStStftftftppp=++++=++++LLLLMNLNLMkqV,kFFTqM∑∑∑∑====+--=LkNqkqLkNqkqkqVNNVVFM112,112,,11)(1p4.4Dq∑∑==+--=LkkqLkkqkqqVLLVVTD12,12,1,1)(1p4.5D4.1.2[7]36Hftt,f*(,)[(,)(,)]RftEHftHffttΔΔ=+Δ+Δ4.6*E[]tfΔΔ,*(0,)[(,)(,)]RtEHftHfttΔ=+Δf4.7*(,0)[(,)(,)]RfEHftHfftΔ=+Δt4.8),0(tRΔ)0,(fRΔPvQu∫ΔΔ-Δ=tdtvjtRvP)2exp(),0()(pf4.9∫ΔΔΔ=fdfujfRuQ)2exp()0,()(pt4.10t1ttt=+Δ4.74.9*111(0,)[(,)(,)]()exp[2()]RttEHftHftPvjttvdvp-==--∫4.111(0,)Rtt-t1tt1t*1()[(,)(,)]PvdvEHftHft=∫4.12*1()[(,)(,)]2PvvdvEHftHftjtp∂=∂∫4.132*21()[(,)(,)](2)vPvdvEHftHftttp∂∂=∂∂∫4.14fHftt(,)()()ffHftxtjyt=+4.15*(,)()()ffHftxtjyt=-4.16(,)[()()]ffHftxtjytt