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Multifunctional Digital Backend for Quasar VLBI network
Journal of Instrumentation ( IF 1.3 ) Pub Date : 2021-05-04 , DOI: 10.1088/1748-0221/16/05/p05003
E. Nosov 1 , D. Marshalov 1 , L. Fedotov 1 , Y. Sheynman 1
Affiliation  

The new 13-meters radio telescope recently built at Svetloe observatory (Russia) required a backend device that could digitize wideband signals from the receiving system, process the signal appropriately, prepare and transmit the resulting signal to the recorder. The previously existing backends, also used at other radio telescopes of Quasar VLBI network, could not provide compatibility with VGOS (VLBI Global Observing System) requirements. We developed Multifunctional Digital Backend (MDBE) with superior performance, flexibility and functions to equip the new antenna and other radio telescopes of the network with the same backend compatible with both domestic and international systems. The MDBE contains up to 12 input channels with 2 GHz bandwidth, powerful and remotely configurable Field programmable gate arrays (FPGA) for digital signal processing, and optical transceivers with total throughput of 50 Gbps per channel. The digital downconverters implemented in FPGA can form sub channels with 0.5, 2, 4, 8, 16, and 32 MHz bandwidth freely tuned with 10 kHz step. In wideband mode a single channel with 512, 1024 or full 2048 MHz bandwidth can be recorded. The MDBE also supports single-dish applications, such as radiometric and spectrometric observations. The paper presents the results of hardware and firmware development of the system, and the experimental results received with the MDBE in Svetloe observatory.



中文翻译:

Quasar VLBI 网络的多功能数字后端

最近在 Svetloe 天文台(俄罗斯)建造的新的 13 米射电望远镜需要一个后端设备,该设备可以将来自接收系统的宽带信号数字化,适当地处理信号,准备并将结果信号传输到记录器。先前存在的后端,也用于 Quasar VLBI 网络的其他射电望远镜,无法提供与 VGOS(VLBI 全球观测系统)要求的兼容性。我们开发了具有卓越性能、灵活性和功能的多功能数字后端(MDBE),为网络的新天线和其他射电望远镜配备了与国内和国际系统兼容的相同后端。MDBE 包含多达 12 个具有 2 GHz 带宽的输入通道,用于数字信号处理的强大且可远程配置的现场可编程门阵列 (FPGA),以及每通道总吞吐量为 50 Gbps 的光收发器。在 FPGA 中实现的数字下变频器可以形成 0.5、2、4、8、16 和 32 MHz 带宽的子通道,以 10 kHz 步长自由调谐。在宽带模式下,可以记录具有 512、1024 或全 2048 MHz 带宽的单通道。MDBE 还支持单碟应用,例如辐射和光谱观测。本文介绍了系统的硬件和固件开发结果,以及在 Svetloe 天文台使用 MDBE 获得的实验结果。和 32 MHz 带宽以 10 kHz 步长自由调谐。在宽带模式下,可以记录具有 512、1024 或全 2048 MHz 带宽的单通道。MDBE 还支持单碟应用,例如辐射和光谱观测。本文介绍了系统的硬件和固件开发结果,以及在 Svetloe 天文台使用 MDBE 获得的实验结果。和 32 MHz 带宽以 10 kHz 步长自由调谐。在宽带模式下,可以记录具有 512、1024 或全 2048 MHz 带宽的单通道。MDBE 还支持单碟应用,例如辐射和光谱观测。本文介绍了系统的硬件和固件开发结果,以及在 Svetloe 天文台使用 MDBE 获得的实验结果。

更新日期:2021-05-04
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