21 July 2010 On-orbit dynamics and controls system architecture for SIM Lite
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Abstract
The dynamic stability of white light fringes formed on the guide and science interferometers in SIM-Lite along with the pointing stability of each arm of each interferometer affect the visibility of fringes and the length of the fringe camera integration time for the observatory. Hence, tight fringe and pointing stability requirements are needed to reduce science interferometer camera integration times, which in turn help increase the all important instrument's observing efficiency. The SIM-Lite Instrument Dynamics and Controls (D&C) System Architecture deals with such dynamic issues through a "tailored" system dynamics design complemented by a comprehensive active control system. The SIM-Lite on-orbit System architecture is described in this paper. Key roles played by the resulting D&C System are also established, while the system design is clearly linked to the four nominal phases of on-orbit operations for the observatory (Tile to Tile slew & settling, guide star acquisition, science observation, & science interferometer retargeting). Top driving requirements dictating system interferometric-baseline stability and repeatability, instrument pointing stability, and fringe stability are discussed here together with the resulting high level Error Budget. Key system sensitivities and currently known D&C related design challenges are also discussed.
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Oscar S. Alvarez-Salazar, Oscar S. Alvarez-Salazar, } "On-orbit dynamics and controls system architecture for SIM Lite", Proc. SPIE 7734, Optical and Infrared Interferometry II, 77341I (21 July 2010); doi: 10.1117/12.856505; https://doi.org/10.1117/12.856505
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