The novel design for giant spherical radio telescope with active main reflector.

Details The novel design for giant spherical radio telescope with active main reflector. The novel design for giant spherical radio telescope with active main reflector.

Apr 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998acaps..18..222q&link_type=abstract

Acta Astrophys. Sin., Vol. 18, No. 2, p. 222 - 228

Astronomy and Astrophysics

Astrophysics

Radio Telescopes: Reflectors

Scientific paper

A novel design for a giant spherical radio telescope is suggested. Instead of using a complex feed system for the correction of the aberration (such as the Arecibo Gregorian subreflector), an active main reflector is proposed. The part of main reflector which is illuminated by the feed is continually adjusted to fit the paraboloid of revolution in real-time when tracking the radio source. Thus a simple feed for a parabolic antenna can be used for this system. This concept is applied in the design of a large spherical radio telescope having a total reflecting spherical surface 500 m in diameter (radius of curvature 300 m), while an usable aperture 300 m. The main advantages in this design are large zenith-angle coverage, a simple feeding system (so that it is easy to achieve broad bandwidth and full polarization) and low cost.

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