Office National D'etudes Et De Recherches Aerospatiales (onera)

Office National D'etudes Et De Recherches Aerospatiales

Isabelle Mocoeur

Laurent Mugnier

Frédéric Cassaing

The invention relates to a method of estimating at least one deformation of the wave front of an observation system or of an object observed by said observation system, characterized in that: at least one diversity image is acquired, in the vicinity of the focal plane of the observation system, in at least one diversity plane, the diversity image comprising a known diversity deformation; and in that in each diversity plane, an image model is determined based on at least one decomposition of the physical pupil of the system into a plurality of subpupils; a decomposition over each subpupil of the sought-after deformation in the form of at least one known deformation weighted by coefficients to be determined; a determination of the transfer function of the system by autocorrelation of its pupil; the linearization of each of the terms of the autocorrelation as a function of the coefficients of the sought-after deformation, the linearization being performed in the vicinity of the known diversity deformation; the object observed and noise; and in that on the basis of the image model(s) determined and of the image(s) acquired, the sought-after deformation(s) or the observed object is (are) estimated.

Method of estimating at least one deformation of the wave front of an optical system or of an object observed by the optical system and associated device

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Fresnes, France

Isabelle Mocoeur