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1、AbstractWiththegrowingdemandofnavigation,location,andpositioningservice,userdevicesneedmoreprecisepositioningcapabilityandhigherperformance.ForthisreasonnewsignalsandmodulationswillbeadoptedbynewGlobalNavigationSatelliteSystems(GNSS),suchastheChineseCompass,theEuropeanGalileo,andthem
2、odernizedGPS.BesidesnewGNSSsignalacquisitionmethodsupdateforthesenewsignals.ComprehensiveanalysisfordifferentcombiningandintegrationtechniquesforacquisitionofnewGNSSsignals,andproposalofmodifiedsemi-coherentintegrationtechniquesarecontributionofthispaper.ModernGNSSsignalswillbecharac
3、terizedbyadata/pilotstructure,thesetwochannelssharethetotaltransmittedpower.Sospecialacquisitiontechniqueshavebeendesignedforefficientlyrecoveringallthetransmittedpower.Inthispaperthreedifferenttechniques,noncoherentcombining,coherentcombining,anddifferentiallycoherentcombiningareana
4、lyzedfordata/pilotstructure.Foreachstrategythetechniquestructureandprobabilitiesofacquisitionprocessareanalyzed.MoteCarlosimulationsareusedtosupporttheoreticalanalysisandcomparisonfortheperformanceofdifferentstrategies.Theproblemofnavigationdatasigntransitionsisconsideredwhenacquirin
5、gGNSSsignalsovermultiplecodeperiods-Inthispaper,fourdifferentintegrationtechniques,noncoherent,coherent,semi-coherent,anddifferentiallycoherentintegrationsareanalyzedbyprobabilitycharacteristic,strategycomplexity,andMonteCarlosimulations.Intheend,amodifiedsemi-coherentintegrationtech
6、niqueisproposedforitshigheracquisitionperformanceandpropercomplexity.Keywords:modernizedGNSS,data/pilotstructure,secondarycode,ROC目录摘要IAbstractII第1章绪论11.1研究背景及意义11.2国内外研究现状2121新体制GNSS信号21.2.2GNSS信号捕获研究内容31.2.3新体制GNSS信号捕获算法41.3论文的主要研究问题及结构6第2章新体制GNSS信号72」新体制GNSS信号特点72.2数据/导频双通道结构82.2.
7、1双通道信号生成原理82.2.2双通道信号功率分配102.3分层扩频码原理与性能112.3.1分层扩频码生成原理112.3.2GALILEOE5a信号扩频码112.3.3E5a扩频码与C/A码性能比较122.4新体制GNSS信号数学模型152.5本章小结16第3章数据/导频双通道信号捕获算法183」GNSS信号捕获基木原理183.1.1GNSS信号捕获数学模型183」.2GNSS信号捕获算法结构193.1.3捕获概率特性203.2联合捕获算法结构及概率特性223.2.1非相干联合捕获算法223.2.2相干联合捕获算法233.2.3差分相干联合捕获算法243.3联
8、合捕获算法性能仿真与分析
