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Evgeny Nosov
Type of contribution: oral

Development of Multipurpose Digital Backend for "Quasar" network radio telescopes

Evgeny Nosov

Multipurpose Digital Backend (MDBE) is a system intended to replace the currently used backends of RT-32 radio telescopes of «Quasar» network. MDBE is compact, light weighted and can be easily placed inside the focal cabin of the antenna. MDBE digitizes up to 8 input signals with 512 MHz bandwidth or up to 4 signals with 1024 MHz bandwidth and processes the signals in FPGA. The system has several operational modes to perform all required types of observations. For VLBI observations, MDBE supports wideband channel mode, digital downconverters (DDC) mode and polyphase filter bank mode. The output data stream is packed into 10G Ethernet frames and transferred through fiber optic lines. MDBE supports VDIF data format for all VLBI observation modes. To ensure compatibility with existing data acquisition systems, the data in DDCs mode can also be packed in Mark5B data format. Besides VLBI observation modes, MDBE implements a spectrometer and a radiometric backend mode. The system implements a broad range of signal analysis features including PCAL extraction, 2-bits data statistics, input signals capture, power spectral density estimation and other. These features allow remote monitoring of the whole system condition and can greatly reduce down time due to faults. MDBE can replace a lot of equipment with one compact device and significantly reduce overall system complexity.