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Proceedings Paper

Control design for momentum-compensated fast steering mirror for WFIRST-AFTA coronagraph instrument
Author(s): Keith Patterson; Joel Shields; Xu Wang; Hong Tang; Ali Azizi; Paul Brugarolas; Milan Mandic; Fang Shi
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Paper Abstract

This paper presents results of the feedback control design for JPL's Fast Steering Mirror (FSM) for the WFIRST- AFTA coronagraph instrument. The objective of this controller is to cancel jitter disturbances in the beam from the spacecraft to a pointing stability of 0.4 masec over the duration of the observation using a momentum- compensated FSM. The plant model for the FSM was characterized experimentally, and the sensor model is based on simulated modeling. The control approach is divided between feedback compensation of low frequency attitude control system (ACS) drift, and feedforward cancellation of high frequency tonal disturbances originating from reaction wheel excitation of the telescope structure. This paper will present various aspects of the controller design, plant characterization, sensor modeling, disturbance estimation, performance simulation, and preliminary experimental testing results.

Paper Details

Date Published: 16 September 2015
PDF: 18 pages
Proc. SPIE 9605, Techniques and Instrumentation for Detection of Exoplanets VII, 96052C (16 September 2015); doi: 10.1117/12.2191813
Show Author Affiliations
Keith Patterson, Jet Propulsion Lab. (United States)
Joel Shields, Jet Propulsion Lab. (United States)
Xu Wang, Jet Propulsion Lab. (United States)
Hong Tang, Jet Propulsion Lab. (United States)
Ali Azizi, Jet Propulsion Lab. (United States)
Paul Brugarolas, Jet Propulsion Lab. (United States)
Milan Mandic, Jet Propulsion Lab. (United States)
Fang Shi, Jet Propulsion Lab. (United States)

Published in SPIE Proceedings Vol. 9605:
Techniques and Instrumentation for Detection of Exoplanets VII
Stuart Shaklan, Editor(s)

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