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ID:46621752
大小:1.65 MB
页数:6页
时间:2019-11-26
《Multi-h﹢CPM遥测信号的定时频率联合估计技术》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、第33卷第6期2014年11月飞行器测控学报JournalofSpacecraftTr&cTechnologyV01.33No.6NOV.2014引用格式:张金荣,吴岭,朱宏权.Multi-hCPM遥测信号的定时频率联合估计技术[J].飞行器测控学报,2014,33(6):485—490.ZhangJinrong,WuLing,ZhuHongquan.JointsymboltimingandfrequencysynchronizationtechnologyforMulti-hCPMtelemetrysignals[J].Jo
2、urnalofSpacecraftTT&CTechnology,2014,33(6):485—490.Multi—hCPM遥测信号的定时频率联合估计技术。张金荣,吴岭,朱宏权(北京跟踪与通信技术研究所·北京·100094)摘要:针对Multi-hCPM(Multi—hContinuePhaseModulation,多指数连续相位调帝1)遥测接收机的符号定时和载波频率同步问题,在分析MLSD(Maximum—likelihoodSequenceDetection,最大似然序列检测)度量值是符号定时偏差和频率偏差的凸函数的基础上,
3、提出一种基于迟/早门和升/降频门的符号定时和频率同步联合估计算法,通过似然值比较,对符号定时偏差和频率偏差进行迭代估计;并对该算法进行仿真,得到不同参数下的同步性能,给出同步参数选择建议。仿真结果表明:将该算法应用到Multi—hCPM遥测系统中,可实现低信噪比信号的快捕和高精度同步。关键词:多调制指数连续相位调制(Multi—hCPM);符号定时;频率同步;最大似然序列检测(MLsD);遥测中图分类号:V556.1文献标志码:A文章编号:1674—5620(2014)06—0485—06I)()I:10.7642/j.iss
4、n.1674—5620.2014—06—0485—06JointSymbolTimingandFrequencySynchronizationTechnologyforMulti-_hCPMTelemetrySignalsZHANGJinrong,WULing,ZHUHongquan(BeijingInstituteofTrackingandTelecommunicationsTechnology,Beijing100094)Abstract:FollowinganalysisofthemeasurementofMLSD(Ma
5、ximum-LikelihoodSequenceDetection)astheconvexcurveofsymboltimingdeviationandfrequencyoffset,thispaperpresentsanewtechniqueofjointsymboltimingandfrequencysynchronizationbasedonearlyorlategatesandfrequencyupordowngatestosolvetheproblemofsymboltimingandfrequencysynchro
6、nizationofMulti—hCPM(ContinuePhaseModulation)fortelemetryreceivers.Symboltimingdeviationandfrequencyoffsetareiterativelyestimatedbycomparingthelikelihoodmeasurements.Theperformanceoftheproposedsynchronizerwasacquiredbysimulationandappropriateparametersarerecommen—de
7、d.Simulationresultsdemonstratedthattheproposedsynchronizerachievedpromisingperformanceevenatlowsignal—to-noiseratiowhenappliedtoaMulti—hCPMtelemetrysystem.Keywords:Multi-hContinuousPhaseModulation(CPM);symboltiming;frequencysynchronization;Maximum—LikelihoodSequence
8、Detection(MLSD);telemetry0引言目前,我国靶场遥测系统主要采用调频体制,虽然采用多符合检测技术可一定程度改善解调误码率性能,但仍存在频谱利用率较低的问题。随着我国靶场遥测系统码速率和作用距离的不断增加,对高功率利用率和高带宽利用率的遥测新体制的需求日益
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