14 July 2008 An improved wavefront control algorithm for large space telescopes
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Abstract
Wavefront sensing and control is required throughout the mission lifecycle of large space telescopes such as James Webb Space Telescope (JWST). When an optic of such a telescope is controlled with both surface-deforming and rigidbody actuators, the sensitivity-matrix obtained from the exit pupil wavefront vector divided by the corresponding actuator command value can sometimes become singular due to difference in actuator types and in actuator command values. In this paper, we propose a simple approach for preventing a sensitivity-matrix from singularity. We also introduce a new "minimum-wavefront and optimal control compensator". It uses an optimal control gain matrix obtained by feeding back the actuator commands along with the measured or estimated wavefront phase information to the estimator, thus eliminating the actuator modes that are not observable in the wavefront sensing process.
© (2008) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Erkin Sidick, Scott A. Basinger, David C. Redding, "An improved wavefront control algorithm for large space telescopes", Proc. SPIE 7015, Adaptive Optics Systems, 70154P (14 July 2008); doi: 10.1117/12.786679; https://doi.org/10.1117/12.786679
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