Pointing large antennas using the conical scan technique

Details Pointing large antennas using the conical scan technique Pointing large antennas using the conical scan technique

Apr 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998a%26as..129..177o&link_type=abstract

Astronomy and Astrophysics Supplement, v.129, p.177-189

Astronomy and Astrophysics

Astrophysics

Techniques: Pointing, Telescopes, Methods: Analytical

Scientific paper

We describe an alternative way of pointing (large) radiotelescopes using a method derived from radar tracking techniques, and generally known as conical scanning. It can be accomplished by using either a feed that is mechanically (or electrically) displaced from the boresight axis, or by fixing the feed and translating or rotating a tilted subreflector. The optimum set-up for radioastronomical application depends upon the antenna configuration, the feed mount, and the sizes/weights of the moving parts involved. In the case of the new Gregorian configuration for the Arecibo telescope, the mechanical and electromagnetic configuration suggests the use of combined motions of the tertiary reflector in elevation and the feed turret in cross-elevation. We analyse several methods of implementing the conical scan technique and evaluate them through numerical simulations.

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