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Proceedings Paper

Integrated telescope model for the James Webb Space Telescope
Author(s): J. S. Knight; D. S. Acton; Paul Lightsey; Allison Barto
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Paper Abstract

Integrated modeling is a valuable tool for analyzing complex optical-mechanical systems such as the James Webb Space Telescope. An implementation, the Integrated Telescope Model (ITM), has been developed for JWST to analyze the performance of the Observatory. ITM is an end-to-end physical math model starting from stellar photons through the image produced by the science data pipeline. The model also includes all effects that contribute to the formation of the image including pointing errors, vibration and thermal distortions of the optical system, and the mechanical response of the mirrors and actuation devices. A time domain interface to the attitude control system rounds out the capabilities. The model is used over the life-cycle of the JWST program including: development, verification and on-orbit operation. ITM is used to perform verification analysis on the set of test data resulting in a statistical assessment of the expected observatory performance. This capability offers numerous advantages to the verification of the system, validation of the wavefront sensing and control (WFS&C) system along with system level studies for design assessments. ITM has been developed to interface to the ground control system in the same way as the actual observatory. This allows it to be used as substitute for the Observatory for training, mission planning and operational trades.

Paper Details

Date Published: 25 September 2012
PDF: 9 pages
Proc. SPIE 8449, Modeling, Systems Engineering, and Project Management for Astronomy V, 84490V (25 September 2012); doi: 10.1117/12.926814
Show Author Affiliations
J. S. Knight, Ball Aerospace & Technologies Corp. (United States)
D. S. Acton, Ball Aerospace & Technologies Corp. (United States)
Paul Lightsey, Ball Aerospace & Technologies Corp. (United States)
Allison Barto, Ball Aerospace & Technologies Corp. (United States)

Published in SPIE Proceedings Vol. 8449:
Modeling, Systems Engineering, and Project Management for Astronomy V
George Z. Angeli; Philippe Dierickx, Editor(s)

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