Accelerometer assisted high bandwidth control of tip-tilt mirror for precision pointing stability

Pointing stability that defines acceptable displacement of an observation target on the optical detector during the exposure time in a satellite telescope system largely dominates the quality of the image. This research proposes a new control approach to improve pointing stability using a tip-tilt m...

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Bibliographic Details
Published in:	2011 Aerospace Conference pp. 1 - 7
Main Authors:	Ken, Fujiwara, Susumu, Yasuda, Nobutaka, Bando, Shin-ichiro, Sakai, Atsuo, Tsuiki, Yoshito, Niwa, Yoichi, Hatsutori, Taihei, Yano, Yoshiyuki, Yamada
Format:	Conference Proceeding
Language:	English
Published:	IEEE 01-03-2011
Subjects:	Accelerometers Adaptive optics Feedforward neural networks Mathematical model Mirrors Transfer functions Vibrations
Online Access:	Get full text
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Summary:	Pointing stability that defines acceptable displacement of an observation target on the optical detector during the exposure time in a satellite telescope system largely dominates the quality of the image. This research proposes a new control approach to improve pointing stability using a tip-tilt mirror. While conventional control systems for a tip-tilt mirror use feedback error signals obtained from the optical detector, the signal loses enough bandwidth to compensate for high frequency disturbances when pointing at a dark reference guide star. This paper presents a control system subsidiarily using accelerometers to generate high bandwidth feedforward control references to a tip-tilt mirror by properly identifying transfer function between acceleration and pointing displacement. The numerical simulation and experiments using a disturbance source and a tip-tilt mirror verifies feasibility of this method.
ISBN:	1424473500 9781424473502
ISSN:	1095-323X 2996-2358
DOI:	10.1109/AERO.2011.5747383