基于Roach Ⅱ的数字频谱仪开发设计  

A Design of a Digital Spectrum Analyzer Based on the Roach Ⅱ Platform

作　　者：刘晔[1,2] 刘奇 李健[1,2] 王玥 Liu Ye;Liu Qi;Li Jian;Wang Yue(Xinjiang Astronomical Observatory,Chinese Academy of Sciences,Urumqi 830011,China;Xinjiang Key Laboratory of Microwave Technology,Urumqi 830011,China)

机构地区：[1]中国科学院新疆天文台,新疆乌鲁木齐830011 [2]新疆微波技术重点实验室,新疆乌鲁木齐830011

出　　处：《天文研究与技术》2020年第4期429-438,共10页Astronomical Research & Technology

基　　金：国家自然科学基金(11973077);中国科学院“西部之光”人才培养引进计划(2019-XBQNXZ-B-020);新疆维吾尔自治区自然科学基金(2019D01B53);中国科学院天文台站设备更新及重大仪器设备运行专项经费支持项目资助.

摘　　要：为实现宽频带电磁环境实时测量,基于Roach II开发平台,开发设计了数字频谱仪,实时带宽10 MHz^2 GHz,动态范围达到55 dB。首先,分析了数字频谱仪开发设计理念和模块参数设置,实现快速扫描模式、脉冲监测模式的测试功能。其次,通过频率响应、动态范围、线性度等关键指标测量及分析,并与商用频谱仪测量结果对比,确定该数字频谱仪具有相对准确的测试精度,可应用于射电望远镜台站宽带实时频谱监测及瞬态信号分析。In order to archive the real-time measurement of the broadband electromagnetic environment,a digital spectrum analyzer is developed and designed based on the Roach II platform.It has a real-time bandwidth of 10 MHz-2 GHz and a dynamic range of 55 dB.Firstly,by analyzing the development and setting concepts of the digital spectrum analyzer and by considering the module parameter settings,the fast scan mode and pulse monitoring mode of the digital spectrum analyzer are implemented.Secondly,by testing and analyzing of the key parameters such as frequency response,dynamic range and linearity,a comparison with commercial spectrum analyzers is made.The results show that the designed digital spectrum analyzer has archived relatively precise test accuracy and can be applied to the broadband real-time spectrum monitoring and transient signal analysis in the radio telescope stations.

关 键 词：数字频谱仪 开发设计 性能测试 信号监测 

分 类 号：P111.44[天文地球—天文学]