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时间:2020-03-26
《球面多探头天线近场测试系统校准方法研究.pdf》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、第38卷第5期仪器仪表学报Vol38No52017年5月ChineseJournalofScientificInstrumentMay.2017球面多探头天线近场测试系统校准方法研究11,2111胡楚锋,郭丽芳,李南京,陈卫军,郭淑霞(1.西北工业大学无人机特种技术重点实验室西安710065;2.西北工业大学电子信息学院西安710072)摘要:球面多探头天线近场测试系统具有测试速度快,可获取待测天线的近场三维数据等优点。然而,多探头形成了多个测试通道,各通道不同的幅度和相位特性将会影响近场测试精度。针对各通道间的不一致性,首先对多探头系统进行机械校准,降低探头角度和位置误差
2、;然后通过测量球面中心到每个探头的辐射信号进行电校准;仿真分析了系统误差和环境因素引起的幅相波动对近场数据外推远场方向图的影响。通过构建半球面多探头天线近场测试系统进行实验验证,结果表明了机械校准和电校准技术的有效性。将校准后的近场数据外推得到远场方向图,通过与远场测量方向图进行对比,验证了幅相误差对外推远场方向图的影响。关键词:天线近场测试;球面多探头系统;校准;幅相误差;外推中图分类号:TN82TH71文献标识码:A国家标准学科分类代码:510.40Studyonthecalibrationmethodofsphericalmultiprobeantennanearfie
3、ldmeasurementsystem11,2111HuChufeng,GuoLifang,LiNanjing,ChenWeijun,GuoShuxia(1.ScienceandTechnologyonLAVLaboratory,NorthwesternPolytechnicalUniversity,Xi′an710065,China;2.SchoolofElectronicsandInformation,NorthwesternPolytechnicalUniversity,Xi′an710072,China)Abstract:Sphericalmultiprobeanten
4、nanearfieldmeasurementsystemhastheadvantagesoffasttestspeedandbeingabletoacquirethethreedimensionalnearfielddataoftheantennatobetested.However,multipleprobesformmultiplechannels,anddifferentamplitudeandphasecharacteristicsofvariouschannelswillaffectnearfieldmeasurementaccuracy.Inordertoel
5、iminatethechannelinconsistency,mechanicalcalibrationofthemultiprobesystemisperformedfirst,whichreducestheangleandpositionerrorsoftheprobe.Thenelectricalcalibrationisperformedthroughmeasuringtheradiationsignalfromthecenterofspheretoeachprobe.Next,theinfluenceofamplitudeandphaseerrorscausedbys
6、ystemerrorsandenvironmentfactorsontheextrapolationoffarfieldradiationpatternfromnearfielddataissimulatedandanalyzed.Asemisphericalmultiprobeantennanearfieldmeasurementsystemwasbuilt,andverificationexperimentwasconducted.Theresultsindicatetheeffectivenessofmechanicalcalibrationandelectric
7、alcalibrationtechniques.Thecalibratednearfielddatawasextrapolatedtoobtainfarfieldradiationpattern,andtheobtainedradiationpatternwascomparedwiththemeasuredfarfieldradiationpattern.Thecomparisonresultverifiesinfluenceofamplitudeandphaseerror
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