The radio environment of the 21 Centimeter Array: RFI detection and mitigation

	The radio environment of the 21 Centimeter Array: RFI detection and mitigation
	Huang, Yan1 ; Wu, Xiang-Ping1 ; Zheng, Qian 2; Gu, Jun-Hua1 ; Xu, Haiguang 3
刊名	RESEARCH IN ASTRONOMY AND ASTROPHYSICS
	2016-02-01
卷号	16 期号:2
关键词	dark ages, reionization, first stars instrumentation: interferometers methods: data analysis: observational techniques: interferometric
英文摘要	Detection 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.
收录类别	SCI
语种	英语
WOS记录号	WOS:000369252500016
内容类型	期刊论文
源URL	[http://ir.bao.ac.cn/handle/114a11/5452]
专题	国家天文台_星系宇宙学研究部
作者单位	1.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China 2.Victoria Univ Wellington, Sch Chem & Phys Sci, Wellington, New Zealand 3.Shanghai Jiao Tong Univ, Dept Phys & Astron, Shanghai 200240, Peoples R China
推荐引用方式 GB/T 7714	Huang, Yan,Wu, Xiang-Ping,Zheng, Qian,et al. The radio environment of the 21 Centimeter Array: RFI detection and mitigation[J]. RESEARCH IN ASTRONOMY AND ASTROPHYSICS,2016,16(2).
APA	Huang, Yan,Wu, Xiang-Ping,Zheng, Qian,Gu, Jun-Hua,&Xu, Haiguang.(2016).The radio environment of the 21 Centimeter Array: RFI detection and mitigation.RESEARCH IN ASTRONOMY AND ASTROPHYSICS,16(2).
MLA	Huang, Yan,et al."The radio environment of the 21 Centimeter Array: RFI detection and mitigation".RESEARCH IN ASTRONOMY AND ASTROPHYSICS 16.2(2016).