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

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.