新一代VLBI数字终端相位校正单元的原理与设计  

PRINCIPLE AND DESIGN OF NEW PHASE-CALIBRATION UNIT IN VLBI DIGITAL BACKEND

作　　者：李炜[1,2] 王锦清[1] 薛祝和[1] 

机构地区：[1]中国科学院上海天文台,上海200030 [2]中国科学院研究生院,北京100049

出　　处：《中国科学院上海天文台年刊》2009年第1期60-70,共11页Annals Shanghai Astronomical Observatory Chinese Academy of Sciences

基　　金：国家自然科学基金(NO.10778632)项目资助课题

摘　　要：该文重点介绍了新一代甚长基线测量终端设备——相位校准单元(又称天线单元)的原理与设计方法,同时给出了基本的测试方法。首先介绍了超宽带窄脉冲的应用和超窄脉冲的传统产生方法,对周期脉冲的宽度、周期、幅度和特定频率的功率之间的关系做出了详细的数学推导。然后提出了一种基于高速数字芯片的设计方案,并将其应用到相位校准单元的设计中。最后介绍了信号指标的测试方法。The paper introduces the principle and design methods of a new generation of VLBI phase-calibration unit,which is also called as antenna unit,and provides the basic test methods. At first,this paper introduces different applications and traditional generating methods of ultra-wideband narrow pulse,and gives a detailed mathematical derivation to tell find the relationship among pulse width,period,amplitude,and the specific frequency’s power of the periodical rectangular pulses. Then a design scheme based on ultra-high speed digital chips is put forward,which is used for phase-calibration unit’s designation. Finally,the test methods of the signal targets are provided.

关 键 词：超宽带极窄脉冲 数字电路 傅里叶变换 相位校准单元 

分 类 号：P22[天文地球—大地测量学与测量工程]