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ID:46627013
大小:2.15 MB
页数:7页
时间:2019-11-26
《一种宽带信道群时延测量方法》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36卷第2期2017年4月飞行器测控学报JournalofSpacecraftTT&CTechnologyV01.36No.2April2017引用格式:马宏,魏明山,彭保童,等.一种宽带信道群时延测量方法[J].飞行器测控学报,2017,36(2):123—129.MaHong,weiMingshan,PengBaotong,eta1.Agroupdelaymeasurementmethodforbroadbandchannels[J].JournalofSpacecraftTT&CTechnology,2017,36(2):123—129.一种宽带信道群时延测量方法
2、马宏1,魏明山2,彭保童1,毛鑫峰1(1.中国人民解放军装备学院·北京·101416;2.中国酒泉卫星发射中心·甘肃酒泉·732750)摘要:针对VLBI(VeryLongBaselineInterferometry,甚长基线干涉测量)系统直接相位差分法的群时延测量精度与分辨率存在矛盾,以及线性最小二乘拟合法不适用于群时延失真链路的问题,采用一种基于非线性拟合的宽带信道群时延测量方法,对出现的问题进行分析与仿真,同时进行了实验验证并获取到实测数据。仿真表明,基于非线性拟合的宽带信道群时延测量方法适用于非线性相位系统,而且群时延的测量精度优于直接相位差分法2个量级。实测数据
3、表明,在270~370MHz频段内,传统的直接相位差分法和线性拟合测量法已失效,而该方法群时延的测量精度优于0.1ns,由此验证非线性拟合法能够以较高精度进行附加相位和群时延特性测量。关键词:甚长基线干涉测量(VLBI);群时延;非线性拟合;拟合残差;宽带信道;相位校准(PCAL)中图分类号:V556;P228.6文献标志码:A文章编号:1674—5620(20l7)02一0123一07D()l:10.7642/i.issn.1674—5620.2017一02一0123一07AGroupDelayMeasurementMethodforBroadbandChannelsM
4、AHon91,WEIMingshan2,PENGBaoton91,MAOXinfen91(1.AcademyofEquipmentCommand,Be玎ing101416;2.JiuquanSatelliteLaunchCentre,Jiuquan,GansuProvince732750)Abstract:ForVLBI(VeryLongBaselineInterferometry)systems,themethodofdirectphasedifferencemeasurementshowscontradictionbetweenthemeasurementaccura
5、cyandresolutionandtheproblemoflinearleastsquaresfittingmethodthatisnotapplicabletogroupdelay.Agroupdelaymeasurementmethodisusedanditisbasedonnonlinearfittingofbroadbandchannels,atthesametimetoobtainmeasureddatatove“fy.Simulationresultsshowthatthemethodisappli—cabletononlinearphasesystems,
6、andgroupdelaymeasurementprecisionisbetterthanthedirectphasedifferencemethodbytwoordersofmagnitude.Themeasureddatashowsthatintheband270~370MHz,thetraditionaIdirectphasediffer—encemethodandllnearfittingmeasurementmethodhavefailed,butthemethodproposedforthegroupdelaymeasurementprecisionisbet
7、terthanthatofO.1ns,itisverifiedthatthenonlinearfittingmethodcancarryoutadditionalphaseandgroupdelaycharacteristicsmeasurementwithhighprecision.Keywords:VeryI。ongBaselineInterferometry(VLBl);groupdelay;nonlinerfitting;fittingresidual;broadbandchannel:PhaseCALibration
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