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1、北斗全球系统导航信号恒包络调制/复用技术研究朱祥维1,黄新明1,宿晨庚2,周鸿伟2,欧钢1(1.国防科技大学电子科学与工程学院,长沙,410073)(2.北京跟踪与通信技术研究所,北京,100094)摘要:出于以导频通道为代表的北斗全球导航卫星系统现代化信号结构升级以及后向兼容的需求,北斗系统近几年提出了多种新型恒包络调制/复用技术,包括适用于北斗系统B1频点的正交复用二进制偏移载波调制(QMBOC)和非对称双正交相移键控调制(ADualQPSK)、B2频点的时分复用AltBOC调制(TD-AltBOC)与非对称恒包络二进制偏移载波调制(ACE-BOC)、B3频点的双正交相移键控调
2、制(DualQPSK)以及适用于双边带任意信号路数、任意功率配比的广义恒包络二进制偏移载波调制(GCE-BOC)。本文系统性地论述了北斗全球系统中提出的多种新型恒包络调制/复用技术,在此基础上基于GCE-BOC调制总结出了一种恒包络调制的统一解析表示形式,对于全面理解北斗全球系统信号设计思路及在此基础上发展设计新型的恒包络调制/复用技术均能提供重要的借鉴。关键词:北斗系统,卫星导航,恒包络调制,二进制偏移载波调制,TD-AltBOC,ACE-BOC,GCE-BOC中图分类号:TN967.1文献标志码:A 文章编号:ResearchofConstantEnvelopeModula
3、tion/MultiplexingTechnologiesforModernBDSGlobalNavigationSignalsZHUXiangwei1,HUANGXinming1,SUChengeng2,ZHOUHongwei2,OUGang1(1.SchoolofElectronicScienceandEngineering,NationalUniv.ofDefenseTechnology,Changsha410073,China2.BeijingInstituteofTrackingandTelecommunicationTechnology,Beijing,100094,C
4、hina)Abstract:Forthepurposeofstructuralenhancementandbackwardscompatibility,BDSNavigationSystemhasproposedseveralnewconstantenvelopemodulationsrecently,includingQMBOCandADualQPSKmodulations,thenewMBOCmodulationandconstantenvelopemultiplexingtechnologiesappliedforB1band;TD-AltBOCandACE-BOCmodul
5、ations,theconstant-envelopemodulationthatmultiplexesfourbinaryspreadingcodesastwoQPSKsignalsattwodifferentcarrierfrequenciesappliedforB2band;DualQPSKmodulation,theconstant-envelopemodulationthatmultiplexesfourbinaryspreadingcodesastwoQPSKsignalsatonecarrierfrequencyappliedforB3band;GCE-BOCmodu
6、lation,theconstant-envelopemodulationthatmultiplexesarbitrarysignalsattwodifferentcarrierfrequencies.Inthispaper,allthenewmodulationsareanalyzed,includingseveralaspectssuchasapplicationbackgrounds,modulationprinciplesandmultiplexingefficiencies.Onthebasisofthis,aunifiedanalyticalexpressionofco
7、nstantenvelopemodulation/multiplexingissummarizedbasedonGCE-BOCmodulation,whichwillprovideanimportantreferenceforthecomprehensiveunderstandingofthesignaldesignoftheBDSglobalnavigationsatellitesystemandthedevelopmentofnewtypeofconstanten