多相滤波器组谱分析方法的性能讨论与天文观测应用

On the Performance of Spectral Analysis with a Polyphase Filter Bank and Its Application in Radio Astronomy

多相滤波器组(PFB)是均匀数字滤波器组的一种高效实现结构,用于信号的均匀子带分解和抽取,对应用多相滤波器组作为功率谱估计器的统计性能与计算量进行分析,与相关图与周期图方法进行比较,并通过仿真及FAST密云模型21cm中性氢谱线观测检验其应用效果。

A Polyphase Filter Bank （ PFB ） is a high-efficiency structure for realizing a uniform digital filter bank. It is mainly used in uniform subband decomposition of signals. In this paper we study the statistical performance and the computation amount of PFB when used as an estimation method of power spectra. We compare it to the traditional periodogram method, and test its performance in the observation of the 21cm HI line with the Miyun 30m Model FAST Radio Telescope.