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Back-end overview (both analog and digital) for VLBI2010

Back-end overview (both analog and digital) for VLBI2010. East Coast Geodetic VLBI Meeting 23-24 Feb, 2011, Haystack Observatory Bill Petrachenko. Goals for the VLBI2010 back-end system. Handle VLBI2010 mode of observation 4 bands each using both linear polarizations

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Back-end overview (both analog and digital) for VLBI2010

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  1. Back-end overview (both analog and digital) for VLBI2010 East Coast Geodetic VLBI Meeting 23-24 Feb, 2011, Haystack Observatory Bill Petrachenko

  2. Goals for the VLBI2010 back-end system • Handle VLBI2010 mode of observation • 4 bands each using both linear polarizations • 1-GHz bandwidth per band • 2-14 GHz input frequency range • Achieve Optimum use of on-source time and record capability • Burst mode • Switch for routing to recorders • Handle multiple inputs, e.g. • More than one VLBI antenna on-site • Holography antenna • Reference antenna for antenna deformations and site ties

  3. VLBI2010 Back-end signal path block diagram Antenna inputs UV_512 V UH_512 UDC (2-14 GHz) RDBE Holography Reference Holography Reference LV_512 Ant1 Ant2 Ant1 Ant2 H LH_512 UV_512 V Burst Mode & Switch Recorder UH_512 1 2 3 4 1 2 3 4 UDC (2-14 GHz) RDBE H-switch V-switch LV_512 Recorder H LH_512 Recorder UV_512 V UH_512 UDC (2-14 GHz) RDBE Recorder LV_512 H LH_512 UV_512 V UH_512 UDC (2-14 GHz) RDBE To external processing e.g. GPS LV_512 H LH_512

  4. Notes on back-end features (1 of 2) • 4-to-1 switches on H- and V-inputs to allow automatic switching between, for example: • Two antennas (Ant1 and ant2) of a 2-antenna site where the antennas are never scheduled to observe simultaneously. • Reference antenna for determining antenna deformations and site ties • Holography antenna for measuring antenna surface. • Extra splitter outputs • For external processing, e.g. GPS. • Enhancements to UDC • 2-14 GHz frequency range • 2x anti-alias filtered V-output @ 512-MHz • 2x anti-alias filtered H-output @ 512-MHz

  5. Notes on back-end features (2 of 2) • Enhancements to RDBE • 2x V-input @ 512-MHz • 2x H-input @ 512-MHz • No gain-control? (already in UDC) • Burst mode processor and switch (needed to avoid inefficient use of media (see attached plot) • Max 32-Gbps input bandwidth, 8-Gbps from each RDBE • Max 16(32?)-Gbps output bandwidth, 4(8?)-Gbps to each of up to 4 record systems • Up to 30(?)-s record capacity at 32-Gbps input rate. • Simultaneous read and write capability

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