16 September 2015 Control design for momentum-compensated fast steering mirror for WFIRST-AFTA coronagraph instrument
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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.
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Keith Patterson, Keith Patterson, Joel Shields, Joel Shields, Xu Wang, Xu Wang, Hong Tang, Hong Tang, Ali Azizi, Ali Azizi, Paul Brugarolas, Paul Brugarolas, Milan Mandic, Milan Mandic, Fang Shi, Fang Shi, "Control design for momentum-compensated fast steering mirror for WFIRST-AFTA coronagraph instrument", Proc. SPIE 9605, Techniques and Instrumentation for Detection of Exoplanets VII, 96052C (16 September 2015); doi: 10.1117/12.2191813; https://doi.org/10.1117/12.2191813


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