The UTMOST: A Hybrid Digital Signal Processor Transforms the Molonglo Observatory Synthesis Telescope
The UTMOST: A Hybrid Digital Signal Processor Transforms the Molonglo Observatory Synthesis Telescope
复制标题
UTMOST：混合数字信号处理器改变了莫隆格洛天文台合成望远镜
DOI：
10.1017/pasa.2017.39
复制
发表时间：
2017
影响因子：
6.3
通讯作者：
D. Temby
中科院分区：
文献类型：
--
作者：
M. Bailes;A. Jameson;Chris Flynn;T. Bateman;E. Barr;S. Bhandari;J. Bunton;M. Caleb;D. Campbell;W. Farah;B. Gaensler;A. Green;R. Hunstead;F. Jankowski;Evan Keane;V. V. Krishnan;T. Murphy;M. O’Neill;S. Osłowski;A. Parthasarathy;V. Ravi;P. Rosado;D. Temby
莫龙洛天文台综合望远镜（MOST）是一台18000平方米的射电望远镜，位于澳大利亚堪培拉40公里处。其工作频段（820-851 MHz）部分分配给电信，使射电天文学具有挑战性。我们描述了新数字接收机、基于现场可编程门阵列的滤波器组和配备43个图形处理单元的服务器级计算机的部署如何将望远镜转变为一种多功能新仪器（UTMOST），用于研究毫秒时间尺度上的无线电天空。UTMOST的带宽是MOST的10倍，视场是MOST的2倍，电压记录和回放能力促进了许多新的观测模式的快速实施，其中大多数是自动操作的。UTMOST可以同时切除干扰，制作地图，相干解色散谱仪，并对色散单脉冲进行相干扇束的实时搜索。UTMOST作为一个机器人设施运行，决定如何有效地瞄准脉冲星，以及通过实时脉冲星折叠在源上停留多长时间，同时搜索单脉冲事件。超过300个脉冲星的定时在调试期间产生了7个脉冲星故障和3个快速射电爆发。UTMOST表明，如果对电压流进行充分的信号处理，即使在恶劣的射频环境中，创新的科学仍然是可能的。
Abstract The Molonglo Observatory Synthesis Telescope (MOST) is an 18000 m2 radio telescope located 40 km from Canberra, Australia. Its operating band (820–851 MHz) is partly allocated to telecommunications, making radio astronomy challenging. We describe how the deployment of new digital receivers, Field Programmable Gate Array-based filterbanks, and server-class computers equipped with 43 Graphics Processing Units, has transformed the telescope into a versatile new instrument (UTMOST) for studying the radio sky on millisecond timescales. UTMOST has 10 times the bandwidth and double the field of view compared to the MOST, and voltage record and playback capability has facilitated rapid implementaton of many new observing modes, most of which operate commensally. UTMOST can simultaneously excise interference, make maps, coherently dedisperse pulsars, and perform real-time searches of coherent fan-beams for dispersed single pulses. UTMOST operates as a robotic facility, deciding how to efficiently target pulsars and how long to stay on source via real-time pulsar folding, while searching for single pulse events. Regular timing of over 300 pulsars has yielded seven pulsar glitches and three Fast Radio Bursts during commissioning. UTMOST demonstrates that if sufficient signal processing is applied to voltage streams, innovative science remains possible even in hostile radio frequency environments.