Radio astronomy gets connected
PARTICLE PHYSICS & ASTRONOMY RESEARCH COUNCIL
Posted: May 25, 2004
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Sir Bernard Lovell
(centre), founder of the Jodrell Bank Observatory, stands by the 76 metre radio
telescope that bears his name. He is accompanied by members of the e-MERLIN team,
representatives of Fujitsu Telecommunications Europe, and Global Crossing UK to
celebrate the start of work on the e-MERLIN fibre network on May 25th.
[Click image to enlarge.]
Image credit: PPARC / Jodrell Bank Observatory.
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On May 25th, work started on the construction of an optical fibre network which will
connect five radio telescopes to the giant 76-m Lovell Telescope at Jodrell Bank
Observatory, operated by The University of Manchester in rural Cheshire, allowing
it to operate with vastly improved sensitivity.
This e-MERLIN network will operate as single radio telescope spanning 217 kilometres,
with unprecedented sensitivity provided by the enormous data rates carried by the
optical fibres. The combination of high resolution due to the large separations
and high sensitivity will make e-MERLIN a world-leading astronomical facility,
continuing the pioneering spirit established by Sir Bernard Lovell over 50 years ago,
and maintaining Jodrell Bank at the forefront of astronomical research well into the
21st century.
The network will use trunk fibres largely provided by Global Crossing UK with new
fibre links from each telescope to the trunks being constructed by Fujitsu
Telecommunications Europe. The total data rate carried by the network will be a
continuous and sustained 150 Gb/s — about five times the total U.K. public Internet
traffic. Finding a way to provide a data network of this capacity on a national scale,
reaching out to rural telescope sites, within the very limited project budget has been
the largest challenge facing the e-MERLIN project. Astronomers and engineers at Jodrell
Bank are delighted to have found a technical and commercial solution which meets their needs.
Dr. Simon Garrington, project manager for e-MERLIN explained: "In an array like MERLIN,
the network which transports the data is performing the same function as the curved dish
of a single large radio telescope, bringing the radio waves to a common focus. With our
present links, we are only able to transport less than half of one percent of the signal
collected by our new receivers to the correlator at Jodrell Bank but with the new fibre
network we will be able to transport an entire 4 GHz band back to Jodrell."
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The e-MERLIN network will link radio telescopes near Cambridge, Worcester and Oswestry with
two more in Cheshire and the Lovell Telescope by high-speed fibre optic cables.
Image credit: PPARC / Jodrell Bank Observatory.
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The MERLIN network was first established in 1980 and is now operated as a national
facility by the University of Manchester on behalf of the Particle Physics and Astronomy
Research Council. It combines radio telescopes near Cambridge, Worcester and Oswestry with
two telescopes in Cheshire as well as the Lovell Telescope. Radio arrays like MERLIN produce
detailed radio images of stars and galaxies. MERLIN's strength has been the high resolution
provided by its 217-kilometre span — it is the only telescope on the ground which can
routinely provide images with as much detail as the Hubble Space Telescope but at radio rather
than optical wavelengths. However, its sensitivity has been limited by the present connections
from the remote telescopes to Jodrell Bank.
Professor Ian Halliday, Chief Executive of PPARC said, "With the upgrade to e-MERLIN,
the UK's National Facility for radio astronomy has ensured that it remains at the forefront
of international research, enabling UK astronomers to make important contributions to
advancing our understanding of the Universe."
By linking the telescopes with optical fibre, the capacity of these connections will be
increased by a factor of more than 100 and together with the newly resurfaced Lovell Telescope
and improved receivers at each telescope, e-MERLIN's sensitivity will be boosted by more than
a factor of 30, guaranteeing a wealth of new discoveries as astronomers from the UK and around
the world use it to zoom in on distant stars and galaxies.
Prof. Philip Diamond, Director of MERLIN, said: "Radio astronomy is crucial to the understanding
of our universe because radio waves penetrate the clouds of cosmic dust and gas that hamper
observations with optical telescopes. Our deepest observations with existing instruments have
given us glimpses of distant galaxies in the process of formation and we are confident that
e-MERLIN will reveal a radio sky teeming with such galaxies, any one of which we will be able
to study in detail."
Roshene McCool, the fibre-optic engineer at Jodrell Bank who is designing the transmission
equipment for the network said: "The fibre network provided by Fujitsu and Global Crossing allows
us to use transmission equipment and protocols which we have developed with colleagues around
the world specifically for radio astronomy data."
Phil Metcalf, managing director of Global Crossing Europe, said: "The high-capacity backbone
linking the e-MERLIN array will give UK astronomers the networking platform they need to open up
a new era of discovery."
Shigeyuki Unagami, managing director of Fujitsu Telecommunications Europe described the project
as "a successful harmony of pioneering science, IT and telecommunications".
The e-MERLIN project has been jointly funded by The University of Manchester, The Northwest
Development Agency (NWDA), the Particle Physics and Astronomy Research Council (PPARC), UMIST
and The University of Cambridge.
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