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页数:5页
时间:2020-06-06
《新型的卫星导航信号体制设计.pdf》由会员上传分享,免费在线阅读,更多相关内容在应用文档-天天文库。
1、JournalofComputerApplicationsISSN10o1—90812014—06—1O计算机应用,2014,34(6):1573—1577CODENJYIIDUhttp://www.joca.an文章编号:1001—9081(2014)06.1573。05doi:10.11772/j.issn.1001—9081.2014.06.1573新型的卫星导航信号体制设计薛睿,徐锡超,魏强(哈尔滨工程大学信息与通信工程学院,黑龙江哈尔滨150001)(通信作者电子邮箱xxc30623733@163.con
2、)摘要:为进一步提高导航信号精度、频带效率及增强导航系统可靠性,提出一种基于低密度奇偶校验(LDPC)码的最小频移键控一二进制偏移载波(MSK—BOC)调制信号体制(LDPC—MSK—BOC)。以Compass和GPS信号典型参数为例,采用功率谱密度、码跟踪误差、多径误差包络、误比特率、解调抗窄带/匹配谱干扰品质因数、码跟踪抗窄带/匹配谱品质因数、谱分离系数等参数来评估二进制偏移载波(BOC)和MSK.BOC两种信号的导航性能。理论分析和仿真结果表明:在频带资源受限的条件下,与BOC信号体制相比,所提出的信号体制在
3、码跟踪精度和抗多径方面有更好的性能;同时可进一步提高系统的可靠性,改善频带利用率。关键词:卫星导航;信号体制;低密度奇偶校验码;最小频移键控;二进制偏移载波中图分类号:TN967.1文献标志码:ANewsignalsystemdesignforsatellitenavigationsystemXUERui,XUXichao,WEIQiang(CollegeofInformationandCommunicationEngineering,HarbinEngineeringUniversity,HarbinHeilon
4、gfiang150001,China)Abstract:InordertoflJrtherimprovetheprecisionofnavigationsignal,bandeficiencyandthereliabilityperformancefornavigationsystems,anewsignalsystemadoptedMinimumShiftKeying(MSK)withBinaryOffsetCarrier(BOC)basedonLowDensityPartyCheck(LI)PC)codeswa
5、spresented,whichwascalledLDPC—MSK—BOCsignalsystem.ThenavigationperformancesoftheBOCandMSK—BOCwereevaluatedbasedontheparametersofCompassandGPStypicalsignals,whichwerescaledwithpowerspettraldensity,codetrackingerror,muhipatherrorenvelope,biterrorrate,anti—na~owb
6、andjammingmeritfactorandanti—matchedspectrumjammingmeritfactorfordemodulationprocessing,anti—na~owbandjammingmeritfactorandanti—matchedspectrumjammingmeritfactorforcodetrackingprocessing,andspectralseparationcoeficient.Thetheoreticalanalysisandsimulationshowth
7、attheproposedsystemhasbetterperformanceinthefieldofcodetrackingprecisionandanti—muhipathcomparedwithBOCsignalsystemunderthelimitedspectrumresourcecondition.Meanwhile,thesignalstructurecanfurtherimprovesystemreliabilityandbandeficiency.Keywords:satellitenavigat
8、ion;signalsystem;LowDensityPartyCheck(LDPC)code;MinimumShiftKeying(MSK);BinaryOffsetCarrier(BOC)热点方向。本文将采用一种非规则准循环(Quasi—Cyclic,0引言Qc)结构的LDPC码——Qc—LDPC,其校验矩阵同时具有准信号体制是全球导航卫星系统(Glob
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