The design and implementation of a ROACH2+GPU based correlator on the Tianlai dish array

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英文篇名：The design and implementation of a ROACH2+GPU based correlator on the Tianlai dish array 作者：Chen-Hui ; Niu ; Qun-Xiong ; Wang ; David ; MacMahon ; Feng-Quan ; Wu ; Xue-Lei ; Chen ; Ji-Xia ; Li ; Hai-Jun ; Tian ; Guillaume ; Shippee ; Dan ; Werthimer ; Xiao-Ping ; Zheng 英文作者：Chen-Hui Niu;Qun-Xiong Wang;David MacMahon;Feng-Quan Wu;Xue-Lei Chen;Ji-Xia Li;Hai-Jun Tian;Guillaume Shippee;Dan Werthimer;Xiao-Ping Zheng;College of Physical Science and Technology, Central China Normal University;Key Laboratory for Computational Astrophysics, National Astronomical Observatories, Chinese Academy of Sciences;University of California Berkeley;College of Science, China Three Gorges University;School of Astronomy and Space Sciences, University of Chinese Academy of Sciences;Center of High Energy Physics, Peking University; 英文关键词：instrumentation:interferometers 中文刊名：TTWL 英文刊名：天文和天体物理学研究(英文版) 机构：College of Physical Science and Technology, Central China Normal University;Key Laboratory for Computational Astrophysics, National Astronomical Observatories, Chinese Academy of Sciences;University of California Berkeley;College of Science, China Three Gorges University;School of Astronomy and Space Sciences, University of Chinese Academy of Sciences;Center of High Energy Physics, Peking University; 出版日期：2019-07-15 出版单位：Research in Astronomy and Astrophysics 年：2019 期：v.19 基金：supported by the Repair and Procurement Program of the Chinese Academy of Sciences (CAS);; the National Natural Science Foundation of China (Grant Nos. 11473044, 11633004, 11773011 and 11761141012);; Mo ST Grants (2016YFE0100300 and 2012AA121701);; the CAS Frontier Science Key Project (QYZDJ-SSWSLH017) 语种：英文; 页：TTWL201907013 页数：10 CN：07 ISSN：11-5721/P 分类号：135-144

摘要

A digital correlator is a crucial element in a modern radio telescope. In this paper, we describe a scalable design for the correlator system of the Tianlai pathfinder array, which is an experiment dedicated to testing key technologies for conducting a 21 cm intensity mapping survey. The correlator implements the FX design, which firstly performs a fast Fourier transform(FFT) including polyphase filter bank(PFB) computation using a Collaboration for Astronomy Signal Processing and Electronics Research(CASPER) Reconfigurable Open Architecture Computing Hardware-2(ROACH2) board, then computes cross-correlations by employing Graphics Processing Units(GPUs). The design has been tested both in laboratory and in actual observation.
        A digital correlator is a crucial element in a modern radio telescope. In this paper, we describe a scalable design for the correlator system of the Tianlai pathfinder array, which is an experiment dedicated to testing key technologies for conducting a 21 cm intensity mapping survey. The correlator implements the FX design, which firstly performs a fast Fourier transform(FFT) including polyphase filter bank(PFB) computation using a Collaboration for Astronomy Signal Processing and Electronics Research(CASPER) Reconfigurable Open Architecture Computing Hardware-2(ROACH2) board, then computes cross-correlations by employing Graphics Processing Units(GPUs). The design has been tested both in laboratory and in actual observation.

引文

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    2https://casper.ssl.berkeley.edu/wiki/ADC16x250-8
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