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Analysis of the TMT mount control system

Thompson, Peter M. and MacMynowski, Douglas G. and Sirota, Mark J. (2008) Analysis of the TMT mount control system. In: Ground-based and Airborne Telescopes II. Proceedings of SPIE. No.7012. Society of Photo-optical Instrumentation Engineers (SPIE) , Bellingham, WA, Art. No. 70121P. ISBN 9780819472229. http://resolver.caltech.edu/CaltechAUTHORS:20181112-100917138

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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.


Item Type:Book Section
Related URLs:
URLURL TypeDescription
https://doi.org/10.1117/12.790277DOIArticle
ORCID:
AuthorORCID
MacMynowski, Douglas G.0000-0003-1987-9417
Additional Information:© 2008 Society of Photo-optical Instrumentation Engineers (SPIE). The authors gratefully acknowledge the support of the TMT partner institutions. They are the Association of Canadian Universities for Research in Astronomy (ACURA), the California Institute of Technology and the University of California. This work was supported as well by the Gordon and Betty Moore Foundation, the Canada Foundation for Innovation, the Ontario Ministry of Research and Innovation, the National Research Council of Canada, the Natural Sciences and Engineering Research Council of Canada, the British Columbia Knowledge Development Fund, the Association of Universities for Research in Astronomy (AURA) and the U.S. National Science Foundation.
Group:Thirty Meter Telescope
Funders:
Funding AgencyGrant Number
Association of Canadian Universities for Research in Astronomy (ACURA)UNSPECIFIED
CaltechUNSPECIFIED
University of CaliforniaUNSPECIFIED
Gordon and Betty Moore FoundationUNSPECIFIED
Canada Foundation for InnovationUNSPECIFIED
Ontario Ministry of Research and InnovationUNSPECIFIED
National Research Council of CanadaUNSPECIFIED
Natural Sciences and Engineering Research Council of Canada (NSERC)UNSPECIFIED
British Columbia Knowledge Development FundUNSPECIFIED
Association of Universities for Research in Astronomy (AURA)UNSPECIFIED
NSFUNSPECIFIED
Subject Keywords:extremely large telescopes, TMT, mount control, servo, azimuth, elevation, tracking, pointing, image jitter
Record Number:CaltechAUTHORS:20181112-100917138
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20181112-100917138
Official Citation:Peter M. Thompson, Douglas G. MacMynowski, Mark J. Sirota, "Analysis of the TMT mount control system," Proc. SPIE 7012, Ground-based and Airborne Telescopes II, 70121P (10 July 2008)
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:90838
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:13 Nov 2018 18:50
Last Modified:13 Nov 2018 18:50

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