衛星导航系统基于fft的扩频码快速捕获算法研究及dsp实现

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1、哈尔滨工业大学工学硕士学位论文AbstractSpreadspectrumisameansoftransmissioninwhichthesignaloccupiesabandwidthinexcessoftheminimumnecessarytosendtheinformation;thebandspreadisaccomplishedbymeansofacodewhichisindependentofthedata,andasynchronizedreceptionwiththecodeatthereceiverisusedfordespreadin

2、gandsubsequentdatarecovery.ThistypeofcommunicationiscalledSpreadSpectrumCommunicationsystem.Thenavigationandpositionsystem,whichisresearchedinthearticle,isatypicalspreadspectrumsystem.Asoneofthekeypartsinacompatiblereceiver,thefastacquisitionofthespreadspectrumsignalwouldplayaver

3、yimportantpartintheoperationofthissystem.ThisthesisaimsatrealizingthefastacquisitionofthespreadspectrumsignalonDSPandsmoothingthethewayofthewholereceiver’sresearch.Atfirst,thispaperintroducesthelatestresearchesintothedomesticandoverseasnavigationsatellitepositioningsystem.Itintro

4、ducethemaincharacteristicofGPSandtheareaofitisbeenused.Italsointroduceswhatisresearchedinthereceiverofthenavigationsatellitepositioningsystem.Secondly,thetheorywhichthereceiverofthenavigationsatellitepositioningsystemstandsonisintroduced.Itintroducesthetheoryofspreadspectrum,itsw

5、orkingprinciple,itsworkingmodeanditsmaincharacteristic.PNcodeisintroducedinbrief.CharacteristicsofPNcode,especiallythecorrelationcharacteristicaredeeplyresearchedinto.Thedemodulationanddespreadofthespreadspectrumsignals,thetrackandcaptureofthespreadspectrumsystemisalsointroduced.

6、Finally,thepaperintroducesthedesignofthefastacquisitionofthespreadspectrumsignalonDSPindetails.TheFFT-basedacquisitionAlgorithmofthespreadspectrumsignalandperformanceisemphasized;therealizationbasedonTMS320C6416isintroducedindetailstoo.Keywordsspreadspectrumcommunicationsystem,re

7、ceiver,acquisition,DSP,TMS320C6416-II-哈尔滨工业大学工学硕士学位论文目录摘要..........................................................................................................................1Abstract............................................................................................

8、...........................II第1章绪论......