基于光子学的微波移频方法研究高永胜*谭佳俊王瑞琼(西北工业大学电子信息学院西安710129)摘要：微波移频技术(MFS)广泛应用于电子对抗、卫星通信、频控阵雷达等系统。基于光子学的微波移频方法具有带宽大、频谱纯净等优点。为了探索基于光子学的微波移频性能，该文对比研究了基于声光移频(AOFS)、锯齿波相位调制(SPM)和I/Q调制3种微波光子移频方法，阐释了3种方法的原理，搭建了对应的原理验证系统，对不同的移频方法进行了实验与分析。结果表明，3种移频方法都可以实现精准的微波信号移频，实现大于30dB的杂散抑制比。但3种移频方法也存在各自的局限性：AOFS的工作频率、带宽和移频方向较为固定，可调谐性低；SPM移频与I/Q调制对输入驱动信号要求严格，系统稳定性较差。关键词：微波信号移频；光子学；声光移频；锯齿波相位调制；I/Q调制中图分类号：TN29文献标识码：A文章编号：1009-5896(2023)06-2123-11DOI:10.11999/JEIT220503ResearchonMicrowaveFrequencyShiftMethodBasedonPhotonicsGAOYongshengTANJiajunWANGRuiqiong(SchoolofElectronicsandInformation,NorthwesternPolytechnicalUniversity,Xi’an710129,China)Abstract:MicrowaveFrequencyShift(MFS)technologyiswidelyusedinelectroniccountermeasures,satellitecommunicationsandfrequencydiversearrayradar.TheMFSmethodbasedonphotonicshastheadvantagesoflargebandwidthandpurespectrum.Inordertoexploretheperformance,threeMFSmethodsbasedonAcousto-OpticFrequencyShifter(AOFS),SawtoothPhaseModulation(SPM)andI/Qmodulationarecomparedinthispaper.Theprinciplesofthethreemethodsareillustratedandthecorrespondingverificationsystemsarebuiltforexperimentsandanalysis.TheresultsshowthatthethreemethodscanachieveaccurateMFSwhosespurioussuppressionratiosaregreaterthan30dB.However,thethreemethodssimultaneouslyhavedifferentlimitations:theoperatingfrequency,bandwidth,andfrequencyshiftdirectionofAOFSarerelativelyfixedwhichmeansthetunabilityislow;methodsbasedonSPMandI/Qmodulationhavestrictrequirementsontheinputdrivingsignalwhichleadstopoorstability.Keywords:MicrowaveFrequencyShift(MFS);Photonics;Acousto-OpticFrequencyShifter(AOFS);SawtoothPhaseModulation(SPM);I/Qmodulation1引言微波移频器或变频器作为一种能够改变输入微波信号频...
