SIM Lite Guide-2 telescope system identification, control design and pointing performance evaluation

Joel F. Shields; Dhemetrio Boussalis; Nanaz Fathpour; Mark Weilert; Inseob Hahn; Asif Ahmed

doi:10.1117/12.857716

21 July 2010 SIM Lite Guide-2 telescope system identification, control design and pointing performance evaluation

Joel F. Shields, Dhemetrio Boussalis, Nanaz Fathpour, Mark Weilert, Inseob Hahn, Asif Ahmed

Proceedings Volume 7734, Optical and Infrared Interferometry II; 77341L (2010) https://doi.org/10.1117/12.857716
Event: SPIE Astronomical Telescopes + Instrumentation, 2010, San Diego, California, United States

Abstract

The Guide-2 telescope (G2T) is an important subsystem of the new SIM Lite Astrometric Observatory. In this paper we present system identification experiments, design and implementation of the G2T stellar pointing loop that achieves milliarcsecond resolution of spacecraft attitude. Special emphasis was placed on characterization and modeling of PZT hysteresis since this nonlinearity plays an important part in the control loop performance. Power spectral densities of the star image centroids were use to evaluate the pointing loop performance with and with out the presence of simulated ACS disturbances injected via a fast steering mirror (FSM).

Citation Download Citation

Joel F. Shields, Dhemetrio Boussalis, Nanaz Fathpour, Mark Weilert, Inseob Hahn, and Asif Ahmed "SIM Lite Guide-2 telescope system identification, control design and pointing performance evaluation", Proc. SPIE 7734, Optical and Infrared Interferometry II, 77341L (21 July 2010); https://doi.org/10.1117/12.857716

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