基于多相滤波器的宽带射电频谱仪设计

Design of a Wideband Spectrum Analyzer Based on Polyphase Filters

提出了一种基于多相滤波器的新型宽带射电频谱仪的设计方案。通过多相滤波器实现宽带射电信号的滤波,对滤波后的基带信号进行数字功率检波,再通过积分控制,最终得到射电信号的频谱强度。仿真分析表明,这一设计具有很好的效果,通过多相滤波器,使信号的速率大为降低,克服了传统频谱仪以及采用FFT实现频谱变换方法的缺点,可以实现对超宽带射电信号的实时频谱分析。

In this paper, we propose a design of a new wideband spectrum analyzer based on polyphase filters. An input wideband radio signal is processed successively by polyphase filters and a power detector, then the output is integrated under a controlled time to finally yield the measurements of the spectral intensities. Simulations show that this design is rather effective. With polyphase filters the data processing amount decreases greatly, which allows overcoming the disadvantages of a traditional method and achieving wideband spectrum analysis in real time.