Presentation, analysis, and simulation of active alignment strategies for the James Webb Space Telescope

Robert S. Upton

doi:10.1117/12.825164

21 August 2009 Presentation, analysis, and simulation of active alignment strategies for the James Webb Space Telescope

Robert S. Upton

Proceedings Volume 7433, Optical System Alignment, Tolerancing, and Verification III; 743302 (2009) https://doi.org/10.1117/12.825164
Event: SPIE Optical Engineering + Applications, 2009, San Diego, California, United States

Abstract

This paper presents three characteristics in the simulated active alignment strategy of the James Webb Space Telescope. The first includes the analysis and comparison of a baseline active alignment strategy with a damped least squares strategy. This baseline utilizes prior knowledge by means of direct human operator interaction to engage sets of telescope compensators to target specific aberration signatures. The baseline is compared to a damped least-squares strategy that utilizes simultaneous engagement of all telescope compensators without explicit human operator interaction to achieve a least-squares telescope compensation. Second, we discuss how the active alignment of the JWST is encapsulated in a linear optical model developed at the Space Telescope Science Institute. This linear optical model provides a framework for an efficient and robust description of the optical control properties of the JWST and clearly articulates the necessity for having a multi-instrument multifield wavefront sensing strategy to overcome control system non independence and the effects of non-common path errors in the main wavefront sensing camera. Finally, we present analytical results that explicitly map the telescope wavefront responses to the telescope control modes, and we present Monte-Carlo optical performance simulation results that demonstrate the efficacy of the damped least-squares active alignment and the priorknowledge active alignment schemes.

Citation Download Citation

Robert S. Upton "Presentation, analysis, and simulation of active alignment strategies for the James Webb Space Telescope", Proc. SPIE 7433, Optical System Alignment, Tolerancing, and Verification III, 743302 (21 August 2009); https://doi.org/10.1117/12.825164

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