Next Generation Space Telescope. II: Proposed Pointing Control System
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VIEW THE ORIGINAL ARTICLEPublication: Journal of Aerospace Engineering
Volume 7, Issue 4
Abstract
The pointing control system of the Hubble Space Telescope (HST) represents the current state of the art for the precision control of a large spacecraft. The proposed Next Generation Space Telescope (NGST) will require an order‐of‐magnitude increase in pointing resolution over that of HST. The use of active optics in the form of a steerable secondary mirror has been proposed for NGST to satisfy these requirements. The primary motivation for this study was to demonstrate the feasibility of satisfying the pointing‐stability requirements by sensing the guide‐star position and steering the optical path of the telescope with the active secondary mirror. To study the requirements of the control system, a two‐degree‐of‐freedom model that retains the rigid‐body mode of the telescope as well as its first oscillatory mode was constructed. The corresponding optimal control law was developed and implemented in a discrete manner to examine the behavior of the system subject to typical spacecraft excitations.
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Information & Authors
Information
Published In
Journal of Aerospace Engineering
Volume 7 • Issue 4 • October 1994
Pages: 375 - 397
Copyright
Copyright © 1994 American Society of Civil Engineers.
History
Received: Sep 28, 1992
Published online: Oct 1, 1994
Published in print: Oct 1994
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