Collaborative Research Projects in Australia:
Radio Astronomy
Dr. Greg Wickham(AARNet)
Dr Tasso TzioumisDr Shaun Amy
Dr Chris Phillips(CSIRO ATNF)
Global Collaborations / APAN28th August 2007
Radio Interferometry
Telescopes focus on a source Closest telescope has delay
introduced Data streams fed into correlator Fringes are calculated:
Provides information on structure and position of radio source
Telescopes focused at different sources – no fringes
Building an Image
Telescopes maintain focus on source for a period of time As the earth rotates more data
is collected
Data fed into correlator
Similar in concept to “time lapse photograph”
Final image is interpolated
Visibility of Sources
eVLBI Strategy
Now 1024 Mbps/telescope - 2 x 1Gbps N x 1Gbps to correlators: Swinburne / Curtin --> 10 Gbps circuits? International: JIVE (n x 1 Gbps); USA; Asia
3 years: CABB correlator at Narrabri Min: 2 x 10 Gbps (8Gbps) / telescope N x 10 Gbps into Narrabri
eVLBI Strategy
5 years: ASKAP N x 10 Gbps per telescope to Correlators New NSW site (Fowler’s Gap) Connections to and in WA & NZ
10 years: SKA Candidates are Australia and South Africa Extreme bandwidth required (up to Tbps)
eVLBI – Strategy in Motion
Huygens Transfer VLBI
EXPReS milestone in the progress towards SKA. International collaborations are extremely important Strategic to be involved
In Australia eVLBI is ~ 10% of the ATNF observations How is this going to evolve is not clear yet And as ASKAP and the SKA come along, there will be bigger
sectors of the community involved
VLBI - Huygens Space Probe
EXPReS
Data Path: Telescopes to Marsfield Marsfield to AARNet AARNet to Jive
Trial: June 3 x 256Mbit/sec streams Using routed network
Full Test: October 3 x 512Mbit/sec streams Using circuits Parkes
EXPReS: Trial
3 x 256 Mbit / sec Combined at Marsfield Temporary 1G connection
to AARNet Routed connection back to
JIVE “Relatively Simple”
Final Experiment
3 x 512Mbit/sec Direct patched in Sydney Not to Scale!
Square Kilometer Array
Thank You!
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