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Proceedings Paper

Real-time alignment and co-phasing of multi-aperture systems using phase diversity
Author(s): S. Vievard; F. Cassaing; A. Bonnefois; L. M. Mugnier; J. Montri
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Paper Abstract

The alignment of the subapertures is a major challenge for future segmented telescopes and telescope arrays. We show here that a phase diversity sensor using two near-focus images can fully and efficiently align a multiple aperture system, both for the alignment (large amplitude tip/tilt aberrations correction) and phasing (piston and small amplitude tip/tilt aberrations correction) modes. We derive a new algorithm for the alignment of the subapertures : ELASTIC. We quantify the novel algorithm performance by numerical simulations and we demonstrate it experimentally on a test bench. We also study the performance of LAPD, a recent real-time algorithm for the phasing of the sub-apertures. This work should simplify the design of future multiple aperture systems.

Paper Details

Date Published: 8 August 2016
PDF: 9 pages
Proc. SPIE 9906, Ground-based and Airborne Telescopes VI, 99062Q (8 August 2016); doi: 10.1117/12.2230679
Show Author Affiliations
S. Vievard, ONERA (France)
Thales Alenia Space (France)
F. Cassaing, ONERA (France)
A. Bonnefois, ONERA (France)
L. M. Mugnier, ONERA (France)
J. Montri, ONERA (France)

Published in SPIE Proceedings Vol. 9906:
Ground-based and Airborne Telescopes VI
Helen J. Hall; Roberto Gilmozzi; Heather K. Marshall, Editor(s)

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