Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004exa....17..407b&link_type=abstract
Experimental Astronomy, Volume 17, Issue 1-3, pp. 407-416
Astronomy and Astrophysics
Astronomy
1
Aperture Efficiency, Field-Of-View, Focal Plane Arrays, Foreshortening Efficiency, System Optimization
Scientific paper
Five out of six Square Kilometre Array (SKA) science programs need extensive surveys at frequencies below 1.4 GHz and only four need high-frequency observations. The latter ones drive to expensive high surface accuracy collecting area, while the former ask for multi-beam receiver systems and extensive post correlation processing. In this paper, we analyze the system cost of a SKA when the field-of-view (FoV) is extended from 1 deg2 at 1.4 GHz to 200 deg2 at 0.7 GHz for three different antenna concepts. We start our analysis by discussing the fundamental limitations and cost issues of wide-band focal plane arrays (FPA) in dishes and cylinders and of wide-band receptors in aperture arrays. We will show that a hybrid SKA in three different antenna technologies will give the highest effective sensitivity for all six key science programs.
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