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Proceedings Paper

Alignment estimation and control of the James Webb Space Telescope mirrors using decomposition of an influence matrix
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Paper Abstract

The James Webb Space Telescope (JWST) is a three-mirror anastigmatic telescope. For a "blind" telescope alignment estimation and control study at the Goddard Space Flight Center (GSFC), influence functions for each of the primary mirror's 18 segments (6 degrees of freedom each) and for the secondary mirror (5 degrees of freedom) were used to construct a 113-element influence matrix. The singular value vector obtained from pseudoinverse of this influence matrix indicates that the most dominant modes in the control of the telescope are rotation, piston, clocking and translation, in order of significance. The application of an iterative-control algorithm to ten cases of random misalignments, involving both the primary segmented mirror and secondary mirror, shows strong convergence after 5 iterations in most of the cases.

Paper Details

Date Published: 10 November 2011
PDF: 8 pages
Proc. SPIE 8336, Integrated Modeling of Complex Optomechanical Systems, 83360T (10 November 2011); doi: 10.1117/12.916794
Show Author Affiliations
Shahram Shiri, NASA Goddard Space Flight Ctr. (United States)
Joseph M. Howard, NASA Goddard Space Flight Ctr. (United States)
David L. Aronstein, NASA Goddard Space Flight Ctr. (United States)

Published in SPIE Proceedings Vol. 8336:
Integrated Modeling of Complex Optomechanical Systems
Torben Andersen; Anita Enmark, Editor(s)

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