RFI spatial processing at nancay observatory : Approaches and experiments
RFI spatial processing at nancay observatory : Approaches and experiments
复制标题
南凯天文台的 RFI 空间处理：方法和实验
DOI：
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发表时间：
2014
期刊：
影响因子：
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通讯作者：
A. Boonstra
中科院分区：
文献类型：
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作者：
G. Hellbourg;R. Weber;K. Abed;A. Boonstra
由于频谱的密集使用和射电望远镜灵敏度的提高，射频干扰(RFI)的抑制已经成为当前和未来射电望远镜设计的敏感话题。在本文中，我们考虑了不同的干扰抑制方案，它们同时利用了时间-频率和空间RFI特征。在特定子空间分解后，这些RFI空间特征被估计，并通过基于投影仪的空间滤波技术应用于相关前后的数据。我们通过仿真和Cramer-Rao下界导数提供了一些性能分析。此外，还给出了使用LOFAR和COMPAGE射电望远镜的实际数据的最新结果。
Because of the denser active use of the spectrum, and because of higher radio telescope sensitivities, radio frequency interference (RFI) mitigation has become a sensitive topic for current and future radio telescope designs. In this paper, we consider different interference mitigation options which take advantage of both time-frequency and spatial RFI signatures. After specific subspace decompositions, these RFI spatial signatures are estimated and applied to pre- or post-correlation data by means of spatial filtering techniques based on projectors. We provide some performance analysis through simulations and Cramer-Rao Lower Bound derivations. In addition, recent results on real data from the LOFAR and EMBRACE radio telescopes are presented.