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Proceedings Paper

Analysis of the TMT mount control system
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Paper Abstract

The TMT mount control system provides telescope pointing and tracking. Requirements include wind disturbance rejection, offsetting time and accuracy, control system robustness, and the magnitude of response at structural resonances. A finite element model of the complete telescope has been developed and the transfer functions used for the control designs are presented. Wind disturbance, encoder, and wave-front-sensor models are presented that are used for the control design. A performance analysis translates the requirements to a required bandwidth. Achieving this bandwidth is important for reducing telescope image motion due to wind-buffeting. A mount control design is presented that meets the demanding requirements by maximizing low frequency gain and using structural filters to roll-off structural modes. The control system analysis includes an outer guide loop using a wave front sensor. Offsetting time and accuracy requirements are satisfied using feed-forward control architecture.

Paper Details

Date Published: 10 July 2008
PDF: 14 pages
Proc. SPIE 7012, Ground-based and Airborne Telescopes II, 70121P (10 July 2008); doi: 10.1117/12.790277
Show Author Affiliations
Peter M. Thompson, Systems Technology, Inc. (United States)
Douglas G. MacMynowski, TMT Observatory Corp. (United States)
Mark J. Sirota, TMT Observatory Corp. (United States)

Published in SPIE Proceedings Vol. 7012:
Ground-based and Airborne Telescopes II
Larry M. Stepp; Roberto Gilmozzi, Editor(s)

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