Fast radio burst search: cross spectrum vs. auto spectrum method
Fast radio burst search: cross spectrum vs. auto spectrum method
复制标题
快速无线电突发搜索：交叉频谱与自动频谱方法
DOI：
10.1088/1674-4527/18/6/69
复制
发表时间：
2018
影响因子：
1.8
通讯作者：
张娟
中科院分区：
文献类型：
--
作者：
刘磊;郑为民;闫振;张娟
寻找快速射电暴（FRBs）是当前射电天文学研究的热点。在这项工作中，我们使用自动光谱和交叉光谱搜索方法对超长基线干涉测量（VLBI）脉冲星观测数据集进行了单脉冲搜索。交叉频谱法首先由Liu等人提出，充分利用基线交叉频谱的条纹相位信息，使信号功率最大化。自动谱搜索方法基于流行的脉冲星软件包PRESTO，从每个站的自动谱中提取单个脉冲。根据我们的比较，交叉频谱方法能够增强信号功率，从而从受高水平射频干扰（RFI）污染的数据中提取单脉冲，这使得在存在RFI的常规VLBI观测中进行快速射电暴搜索成为可能。
The search for fast radio bursts (FRBs) is a hot topic in current radio astronomy studies. In this work, we carry out a single pulse search with a very long baseline interferometry (VLBI) pulsar observation data set using both auto spectrum and cross spectrum search methods. The cross spectrum method, first proposed in Liu et al., maximizes the signal power by fully utilizing the fringe phase information of the baseline cross spectrum. The auto spectrum search method is based on the popular pulsar software package PRESTO, which extracts single pulses from the auto spectrum of each station. According to our comparison, the cross spectrum method is able to enhance the signal power and therefore extract single pulses from data contaminated by high levels of radio frequency interference (RFI), which makes it possible to carry out a search for FRBs in regular VLBI observations when RFI is present.