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首页> 外文期刊>Journal of Astrophysics and Astronomy >Real-time RFI filtering for uGMRT: Overview of the released system and relevance to the SKA
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Real-time RFI filtering for uGMRT: Overview of the released system and relevance to the SKA

机译：uGMRT的实时RFI过滤：已发布系统的概述以及与SKA的相关性

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摘要

Abstract Radio Frequency Interference (RFI) of impulsive nature is created by sources like sparking on high-power transmission lines due to gap or corona discharge and automobile sparking, and it affects the entire observing frequency bands of low-frequency radio telescopes. Such RFI is a significant problem at the Upgraded Giant Metrewave Radio Telescope (uGMRT). A real-time RFI filtering scheme has been developed and implemented to mitigate the effect on astronomical observations. The scheme works in real-time on pre-correlation data from each antenna and allows the detection of RFI based on median absolute deviation statistics. The samples are identified as RFI-based on user-defined thresholds and are replaced by digital noise, a constant or zeros. We review the testing and implementation of this system at the uGMRT. We illustrate the effectiveness of the filtering for continuum, spectral line and time-domain data. The real-time filter is released for regular observations in the bands falling in 250–1450 MHz, and recent observing cycles show growing usage. Further, we explain the relevance of the released system to the Square Kilometer Array (SKA) receiver chain and possible ways of implementation to meet the computational requirements.
机译：摘要 脉冲性射频干扰（RFI）是由间隙或电晕放电引起的大功率输电线路上的火花和汽车火花等来源产生的，它影响低频射电望远镜的整个观测频段。这种RFI是升级后的巨型中波射电望远镜（uGMRT）的一个重大问题。已经开发并实施了实时RFI滤波方案，以减轻对天文观测的影响。该方案实时处理来自每个天线的预相关数据，并允许根据中值绝对偏差统计数据检测 RFI。样本被识别为基于用户定义的阈值的RFI，并被数字噪声、常数或零代替。我们在uGMRT上审查了该系统的测试和实施。我们说明了连续谱、谱线和时域数据滤波的有效性。实时滤波器被释放出来，用于在250-1450 MHz频段进行常规观测，最近的观测周期显示出越来越多的使用量。此外，我们解释了已发布的系统与平方公里阵列（SKA）接收机链的相关性，以及满足计算要求的可能实现方式。

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