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Proceedings Paper

Design and field performance of the KVN main axis control system
Author(s): David R. Smith; Kamal Souccar; Jeff Kendall
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Paper Abstract

In early December 2007, the first of the three Korean VLBI Network (KVN) 21m diameter telescopes was brought under servo control of the main axes. In addition to the usual slewing and tracking modes common to most radio telescopes, the KVN antennas will be used extensively for VLBI and thus also have a requirement to permit them to move and settle rapidly during fast switching motions to improve phase stability. These requirements place substantial demands on the controller. To reach the required precision, a digital Drive Control Unit (DCU) is coupled with a digital Antenna Control Unit (ACU). The control law incorporates a state space controller with a full state estimator, combined with a trajectory generator and both velocity and acceleration feedforward to improve tracking performance during fast switching motions. We discuss the design of the DCU, ACU, and the control algorithm, and we present the initial results for the encoder-based pointing accuracy during calm and windy conditions while tracking, as well as the path tracking and settling performance during fast switching.

Paper Details

Date Published: 14 July 2008
PDF: 10 pages
Proc. SPIE 7019, Advanced Software and Control for Astronomy II, 701906 (14 July 2008); doi: 10.1117/12.790263
Show Author Affiliations
David R. Smith, MERLAB, P.C. (United States)
Kamal Souccar, Univ. of Massachusetts, Amherst (United States)
Jeff Kendall, EM Interface (United States)

Published in SPIE Proceedings Vol. 7019:
Advanced Software and Control for Astronomy II
Alan Bridger; Nicole M. Radziwill, Editor(s)

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