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Proceedings Paper

UKIRT fast guide system improvements
Author(s): Al Balius; Nicholas P. Rees
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Paper Abstract

The United Kingdom Infra-Red Telescope (UKIRT) has recently undergone the first major upgrade program since its construction. One part of the upgrade program was an adaptive tip-tilt secondary mirror closed with a CCD system collectively called the fast guide system. The installation of the new secondary and associated systems was carried out in the first half of 1996. Initial testing of the fast guide system has shown great improvement in guide accuracy. The initial installation included a fixed integration time CCD. In the first part of 1997 an integration time controller based on computed guide star luminosity was implemented in the fast guide system. Also, a Kalman type estimator was installed in the image tracking loop based on a dynamic model and knowledge of the statistical properties of the guide star position error measurement as a function of computed guide star magnitude and CCD integration time. The new configuration was tested in terms of improved guide performance nd graceful degradation when tracking faint guide stars. This paper describes the modified fast guide system configuration and reports the results of performance tests.

Paper Details

Date Published: 18 September 1997
PDF: 12 pages
Proc. SPIE 3112, Telescope Control Systems II, (18 September 1997); doi: 10.1117/12.287767
Show Author Affiliations
Al Balius, Joint Astronomy Ctr. (United States)
Nicholas P. Rees, Joint Astronomy Ctr. (United States)

Published in SPIE Proceedings Vol. 3112:
Telescope Control Systems II
Hilton Lewis, Editor(s)

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