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Control of a Hypersegmented Space Telescope

MacMynowski, Douglas G. (2012) Control of a Hypersegmented Space Telescope. Journal of Guidance Control and Dynamics, 35 (3). pp. 861-867. ISSN 0731-5090. doi:10.2514/1.55428.

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The primary mirror diameter of affordable space telescopes is limited by mass and manufacturing cost. Currently planned optical/near-infrared space telescopes use a segmented primary mirror with relatively few segments and make limited use of real-time position control. However, control can be used as an enabler for a fundamentally different, very highly segmented architecture, leading to a significant reduction in areal density, and hence a significant increase in the realistically achievable diameter of a space telescope. Weight can be reduced by minimizing the structure that supports mirror segments and instead relying on control for overall stiffness. Furthermore, smaller segments can be thinner (hence, lighter) while still providing sufficient internal rigidity. However, with these architectural changes, the control problem involves not only thousands of actuators and sensors but also many lightly damped modes within the control bandwidth. The objective here is to demonstrate that this control problem is solvable by applying a local control approach. This is illustrated for a 30-m-diam primary mirror composed of 12,000 0.3-m-diam segments.

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MacMynowski, Douglas G.0000-0003-1987-9417
Additional Information:© 2011 by the American Institute of Aeronautics and Astronautics, Inc. Received 25 June 2011; revision received 24 September 2011; accepted for publication 26 September 2011. The simulation code used here was developed by Mattias Björklund, of the Royal Institute of Technology (KTH), Sweden.
Issue or Number:3
Record Number:CaltechAUTHORS:20120608-135613054
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:31855
Deposited By: Tony Diaz
Deposited On:12 Jun 2012 20:47
Last Modified:09 Nov 2021 20:01

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