NAOC Open IR
theradioenvironmentofthe21centimeterarrayrfidetectionandmitigation
Huang Yan1; Wu Xiangping1; Zheng Qian2; Gu Junhua1; Xu Haiguang3
2016
Source Publicationresearchinastronomyandastrophysics
ISSN1674-4527
Volume16Issue:2
AbstractDetection and mitigation of radio frequency interference (RFI) is the first and also the key step for data processing in radio observations, especially for ongoing low frequency radio experiments towards the detection of the cosmic dawn and epoch of reionization (EoR). In this paper we demonstrate the technique and efficiency of RFI identification and mitigation for the 21 Centimeter Array (21CMA), a radio interferometer dedicated to the statistical measurement of EoR. For terrestrial, man-made RFI, we concentrate mainly on a statistical approach by identifying and then excising non-Gaussian signatures, in the sense that the extremely weak cosmic signal is actually buried under thermal and therefore Gaussian noise. We also introduce the so-called visibility correlation coefficient instead of conventional visibility, which allows a further suppression of rapidly time-varying RFI. Finally, we briefly discuss removals of the sky RFI, the leakage of sidelobes from off-field strong radio sources with time-invariant power and a featureless spectrum. It turns out that state of the art technique should allow us to detect and mitigate RFI to a satisfactory level in present low frequency interferometer observations such as those acquired with the 21CMA, and the accuracy and efficiency can be greatly improved with the employment of low-cost, high-speed computing facilities for data acquisition and processing.
Language英语
Funding Project[National Natural Science Foundation of China] ; [Marsden Fund grant in New Zealand]
Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/52759
Collection中国科学院国家天文台
Affiliation1.中国科学院国家天文台
2.惠灵顿维多利亚大学
3.上海交通大学
First Author AffilicationNational Astronomical Observatories, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
Huang Yan,Wu Xiangping,Zheng Qian,et al. theradioenvironmentofthe21centimeterarrayrfidetectionandmitigation[J]. researchinastronomyandastrophysics,2016,16(2).
APA Huang Yan,Wu Xiangping,Zheng Qian,Gu Junhua,&Xu Haiguang.(2016).theradioenvironmentofthe21centimeterarrayrfidetectionandmitigation.researchinastronomyandastrophysics,16(2).
MLA Huang Yan,et al."theradioenvironmentofthe21centimeterarrayrfidetectionandmitigation".researchinastronomyandastrophysics 16.2(2016).
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