Dual-mode disturbance-accommodating pointing controller for Hubble Space Telescope

Details Dual-mode disturbance-accommodating pointing controller for Hubble Space Telescope Dual-mode disturbance-accommodating pointing controller for Hubble Space Telescope

Mar 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995jgcd...18..200a&link_type=abstract

Journal of Guidance, Control, and Dynamics (ISSN 0731-5090), vol. 18, no. 2, p. 200-207

Computer Science

Performance

Control Systems Design, Hubble Space Telescope, Pointing Control Systems, Satellite Control, Solar Arrays, Structural Vibration, Thermal Expansion, Vibration Damping, Computerized Simulation, Control Theory, Feedback Control, Mathematical Models, Torque, Vibration Mode

Scientific paper

Cyclic thermal expansions and mechanical stiction effects in the solar arrays on the Hubble Space Telescope (HST) are triggering repeated occurrences of damped, relaxation-type flex-body vibrations of the solar arrays. Those solar array vibrations are, in turn, causing unwanted deviations of the telescope from its specified pointing direction. In this paper we propose two strategies one can adopt in designing a telescope-pointing controller to cope with the aforementioned disturbances: 1) a total isolation (TI) control strategy whereby the HST controller torques are designed to adaptively counteract and cancel out the persistent disturbing torques that are causing the unwanted telescope motions and 2) an array damping (AD) control strategy whereby the HST controller torques are used to actively augment the natural dampening of the solar array vibrations and the attendant telescope motions, between triggerings of the stiction-related flex-body relaxation oscillations. Using the principles of disturbance accommodation control theory, a dual-mode controller for a generic, planar-motion (single-axis) model of the HST is proposed. This controller incorporates both the TI and AD modes of disturbance accommodation. Simulation studies of the closed-loop system using generic parameter values clearly indicate, qualitatively, the enhanced pointing performance such a controller can achieve.

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