Wavefront correction of optical beam for large space mirrors using robust control techniques

For an imaging spacecraft to provide higher resolution imaging capability, the satellite will require larger mirrors. Because of the weight and launch constraints for space-based optics systems, the mirrors will have to be segmented and light-weight, resulting in increased flexibility and lower stru...

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Bibliographic Details
Published in:Acta astronautica 2011, Vol.68 (1), p.141-148
Main Authors: Kim, Jae Jun, Burtz, Daniel C., Agrawal, Brij N.
Format: Article
Language:English
Subjects:
Adaptive optics
Apertures
Beams (radiation)
Computer simulation
Imaging
Launches
Robust control
Segmented mirror telescope
Wave fronts
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Summary:For an imaging spacecraft to provide higher resolution imaging capability, the satellite will require larger mirrors. Because of the weight and launch constraints for space-based optics systems, the mirrors will have to be segmented and light-weight, resulting in increased flexibility and lower structural frequencies. Consequently, achieving surface accuracy requirements for high resolution imaging with these large aperture light-weight mirrors become a challenging task. This paper investigates the use of adaptive optics for wavefront sensing and surface control of large segmented mirrors. An H ∞ robust control technique is considered for the control of the adaptive optics system with the reduced number of inputs and outputs using singular value decomposition and Zernike polynomials. The robust controller design with the reduced model is validated with a computer simulation for a full plant in the presence of disturbances.
ISSN:0094-5765
1879-2030
DOI:10.1016/j.actaastro.2010.07.017