Huang Yan1; Wu Xiangping1; Zheng Qian2; Gu Junhua1; Xu Haiguang3
Source Publicationresearchinastronomyandastrophysics
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.
Funding Project[National Natural Science Foundation of China] ; [Marsden Fund grant in New Zealand]
Document Type期刊论文
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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