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An innovative, highly sensitive receiver system for the Square Kilometre Array Mid Radio Telescope

Abstract : The Square Kilometre Array (SKA) Project is a global science and engineering project realizing the next-generation radio telescopes operating in the metre and centimetre wavelengths regions. This paper addresses design concepts of the broadband, exceptionally sensitive receivers and reflector antennas deployed in the SKA1-Mid radio telescope to be located in South Africa. SKA1-Mid (350 MHz - 13.8 GHz with an option for an upper limit of 24 GHz) will consist of 133 reflector antennas using an unblocked aperture, offset Gregorian configuration with an effective diameter of 15 m. Details on the unblocked aperture Gregorian antennas, low noise front ends and advanced direct digitization receivers, are provided from a system design perspective. The unblocked aperture results in increased aperture efficiency and lower side-lobe levels compared to a traditional on-axis configuration. The low side-lobe level reduces the noise contribution due to ground pick-up but also makes the antenna less susceptible to ground-based RFI sources. The addition of extra shielding on the sub-reflector provides a further reduction of ground pick-up. The optical design of the SKA1-Mid reflector antenna has been tweaked using advanced EM simulation tools in combination with sophisticated models for sky, atmospheric and ground noise contributions. This optimal antenna design in combination with very low noise, partially cryogenic, receivers and wide instantaneous bandwidth provide excellent receiving sensitivity in combination with instrumental flexibility to accommodate a wide range of astronomical observation modes.
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https://hal.archives-ouvertes.fr/hal-01401277
Contributor : Marie-Paule Pomies <>
Submitted on : Wednesday, November 23, 2016 - 10:17:49 AM
Last modification on : Monday, November 23, 2020 - 2:38:11 PM

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Gie Han Tan, Robert Lehmensiek, Bhushan Billade, Krzysztof Caputa, S. Gauffre, et al.. An innovative, highly sensitive receiver system for the Square Kilometre Array Mid Radio Telescope. 2016SPIE.9906E.60T - Proceedings of the SPIE, Ground-based and Airborne Telescopes VI, Volume 9906, id. 990660 20 pp. (2016), held 26-06 au 01-07-2016 in Edinburgh, United Kingdom, Jun 2016, Edinburgh, United Kingdom. ⟨10.1117/12.2230897⟩. ⟨hal-01401277⟩

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