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1、AbstractSpreadspectrumcommunicationsystemhastheadvantageofthesafetyof
communication,concealmentofinformation,anti-interferenceandsoon.Therefore,the
fieldofdigitalcommunicationbecomespopularintheenvironmentofsecrecy
communicationandbadelectromagnetism,andbecomeshotspotofwireless
communicationgradua
2、lly.Therefore,peoplepaymoreandmoreattentiontotheresearchof
thehigh-poweredspreadspectrumreceiver.BecauseoftheeffectofDoppler,thefrequency
shiftbetweenthelocalcarrierandreceivingcarrierfluctuatesheavily,whichhavebrought
greatdifficultyoftrackingsynchronizationofcarrier.Thepaperhasresearchedinallusi
3、on
tothetheoreticalandpracticalproblemwhichcomesacrossintheprocessofresearching
directsequencespreadspectrumreceiver,analyzedtheinfluencewhichisbroughtalong
thatDopplertothetrackingsynchronizationandtrackingaccuracyoflocalcarrierand
discussedthedigitalrealizationofphaselockedloop.Thepaperhasexpoun
4、dedtherationaleofcarrierresumingofspreadspectrumreceiver
intheaspectofcompositionofcarrierresumingsystem,mathematicmodel,prime
capabilityindex,trackingscheme,frequencylockedloop,phaselockedloop,andsoon,
andemphasizetheoreticalanalysisandsimulatedstudyofAFC,Costasandtwoloops
switch.Thepaperhasanaly
5、zedthetrackingschemeofFLL+PLL,anddesignstheloop
filterforphaselockedloop,meanwhile,explainsitsdigitalrealizedmethod.Intheend,we
havebuiltthemodelofspreadspectrumcommunicationsystemforsimulation,through
SPWsimulationsoftware,designedcarriertrackingmodelofdirectsequencespread
spectrumreceiver,gotthe
6、statisticalerrorofcarrierwavetrackinginthesituationof
differentDopplerfrequencyshiftandDopplerchangerates,andvalidatedtheabove
theoreticalanalysisanddesign.Resulthasindicatedthatthisdesignschemesolvedthisproblemwell，whichisbroughtbyeffectofDoppler,andisabletofulfilltherequestoftrackingaccuracy.Key
7、words:spreadspectrumreceiver;carriertracking;phaselockedloopII目录摘要................................................................................................................IAbstract.........................
