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The engineering face-lift of the 32m dish: technical upgrades of Ghana Radio Astronomy Observatory (GRAO)
Ist Teil von
Journal of instrumentation, 2024-05, Vol.19 (5), p.T05012
Ort / Verlag
Bristol: IOP Publishing
Erscheinungsjahr
2024
Quelle
Alma/SFX Local Collection
Beschreibungen/Notizen
Abstract
Ghana's 32-meter radio telescope, inaugurated in August 2017, was once a redundant
telecommunications dish that underwent conversion. Prior to this transformation, feasibility
studies were conducted to assess the dish's structural integrity, technical compatibility, and
economic viability. These studies aimed to determine if the conversion project could be
technically achieved given the available technology, expertise, and resources. This paper delves
into the engineering considerations surrounding structural, mechanical, software, control and
monitoring, radio frequency, and timing frequency reference requirements that distinguish the
operation of a radio telescope from its former role as a satellite earth station. Significant
components such as the azimuth bearing, sub-reflector support, cable wrap, and electrical motors
underwent replacement. Additionally, a new C-band receiver, radio frequency controller, active
hydrogen maser timing frequency, and software were developed. Testing protocols to meet science
requirements for both single-dish observations and Very Long Baseline Interferometry (VLBI) are
also discussed. The conversion process proved to be lengthy and encountered numerous unforeseen
circumstances, yet it provided invaluable learning experiences for a developing country
like Ghana.