Analysis of the TMT mount control system

Peter M. Thompson; Douglas G. MacMynowski; Mark J. Sirota

doi:10.1117/12.790277

10 July 2008 Analysis of the TMT mount control system

Peter M. Thompson, Douglas G. MacMynowski, Mark J. Sirota

Proceedings Volume 7012, Ground-based and Airborne Telescopes II; 70121P (2008) https://doi.org/10.1117/12.790277
Event: SPIE Astronomical Telescopes + Instrumentation, 2008, Marseille, France

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.

Citation Download Citation

Peter M. Thompson, Douglas G. MacMynowski, and Mark J. Sirota "Analysis of the TMT mount control system", Proc. SPIE 7012, Ground-based and Airborne Telescopes II, 70121P (10 July 2008); https://doi.org/10.1117/12.790277

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available