Fourier domain excision of periodic radio frequency interference
Fourier domain excision of periodic radio frequency interference
复制标题
周期性射频干扰的傅里叶域消除
DOI：
10.1051/0004-6361/202040164
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发表时间：
2020
影响因子：
6.5
通讯作者：
D. Vohl
中科院分区：
文献类型：
--
作者：
Y. Maan;J. van Leeuwen;D. Vohl
时域无线电数据中脉冲星和快速射电暴 (FRB) 的发现和研究经常受到射频干扰 (RFI) 的阻碍。其中一些地面射频干扰是脉冲性的、明亮的，并且相对容易识别和消除。然而，其他人为信号较弱但具有周期性，它们的持续存在可能会淹没天体物理信号。在这里，我们证明了周期性 RFI 的傅里叶域消除是检测微弱宇宙信号的有效且强大的步骤。我们发现应用该方法显着提高了瞬态和周期性脉冲星信号的信噪比。在现场研究中，我们检测到来自脉冲星和快速射电暴的单个脉冲，否则这些脉冲将被隐藏在背景噪声中。我们证明该方法对脉冲星脉冲形状没有负面影响，并且它增强了计时活动。我们在来自许多大型射电望远镜的现实数据上演示了该方法，并得出结论，傅里叶域 RFI 消除将天体物理源的有效灵敏度提高了很大一部分，在强 RFI 的情况下甚至可以大于一个数量级。该方法的加速实现在标准时域无线电数据格式上运行并且是公开可用的。
The discovery and study of pulsars and fast radio bursts (FRBs) in time-domain radio data is often hampered by radio frequency interference (RFI). Some of this terrestrial RFI is impulsive and bright, and relatively easy to identify and remove. Other anthropogenic signals, however, are weaker yet periodic, and their persistence can drown out astrophysical signals. Here we show that Fourier-domain excision of periodic RFI is an effective and powerful step in detecting weak cosmic signals. We find that applying the method significantly increases the signal-to-noise ratio of transient and periodic pulsar signals. In live studies we detected single pulses from pulsars and FRBs that would otherwise have remained buried in background noise. We show the method has no negative effects on pulsar pulse shape, and that it enhances timing campaigns. We demonstrate the method on real-life data from a number of large radio telescopes, and conclude that Fourier-domain RFI excision increases the effective sensitivity to astrophysical sources by a significant fraction, which can be even larger than an order of magnitude in the case of strong RFI. An accelerated implementation of the method runs on standard time-domain radio data formats and is publicly available.
影响因子：
6.5
作者：
van Haarlem, M. P.;Wise, M. W.;van Zwieten, J.
通讯作者：
van Zwieten, J.