A data acquisition system of the S/X-wave range of the radio interferometer for the universal time on-line monitoring

Fedotov, L. V.; Kol’tsov, N. E.; Marshalov, D. A.; Nosov, E. V.

doi:10.1134/s0020441213030032

Cited by 2 publications

(2 citation statements)

References 6 publications

(10 reference statements)

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“…In 2015, two fast VGOS-compatible 13-meter radio telescopes (RT-13) were constructed in Zelenchukskaya and Badary observatories [10]. The antennas were initially equipped with simple, cheap and reliable VLBI backends called BRAS [11], that support up to 8 channels of 512 MHz each. This allowed to begin the domestic VLBI observations with total output data rate of 16 Gbps well before VGOS observations with comparable data rates started in other countries.…”

Section: Introductionmentioning

confidence: 99%

“…But the BRAS is not fully compatible with neither VGOS standard or legacy systems. We had to develop a new backend satisfying all current and oncoming needs of the Quasar VLBI network, which could 2021 JINST 16 P05003 replace all the diverse backends of RT-13 and RT-32 antennas with one unified system backwardly compatible with predecessors [11][12][13]. This paper summarizes the effort of the authors in creating such Multifunctional Digital Backend (MDBE), the first sample of which was installed in 2020 in the recently built RT-13 radio telescope in Svetloe observatory.…”

Section: Introductionmentioning

confidence: 99%

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Multifunctional Digital Backend for Quasar VLBI network

Nosov¹,

Marshalov²,

Fedotov³

et al. 2021

J. Inst.

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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.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%