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Proceedings Paper • Open Access

Marginal estimator for the aberrations of a space telescope by phase diversity
Author(s): Amandine Blanc; Laurent Mugnier; Jérôme Idier

Paper Abstract

In this communication, we propose a novel method for estimating the aberrations of a space telescope from phase diversity data. The images recorded by such a telescope can be degraded by optical aberrations due to design, fabrication or misalignments. Phase diversity is a technique that allows the estimation of aberrations. The only estimator found in the relevant literature is based on a joint estimation of the aberrated phase and the observed object. We recall this approach and study the behavior of this joint estimator by means of simulations. We propose a novel marginal estimator of the sole phase. it is obtained by integrating the observed object out of the problem; indeed, this object is a nuisance parameter in our problem. This reduces drastically the number of unknown and provides better asymptotic properties. This estimator is implemented and its properties are validated by simulation. its performance is equal or even better than that of the joint estimator for the same computing cost.

Paper Details

Date Published: 21 November 2017
PDF: 11 pages
Proc. SPIE 10569, International Conference on Space Optics — ICSO 2000, 1056906 (21 November 2017); doi: 10.1117/12.2307950
Show Author Affiliations
Amandine Blanc, ONERA (France)
Laurent Mugnier, ONERA (France)
Jérôme Idier, Lab. des Signaux et Systèmes (France)


Published in SPIE Proceedings Vol. 10569:
International Conference on Space Optics — ICSO 2000
Georges Otrio, Editor(s)

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