Back end overview both analog and digital for vlbi2010
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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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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

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


Back end overview both analog and digital for vlbi2010

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


Notes on back end features 1 of 2

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


Notes on back end features 2 of 2

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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