Multi-aperture imaging based on complex-field sensing: Numerical analysis of key requirements

We consider the development of an imaging system consisting of an array of optical apertures for operation over long atmospheric paths. Typical multi-aperture systems combine the information collected by the apertures in an optical manner. In contrast, image formation in our approach is performed digitally according to the following procedure: (1) the complex-valued amplitude of the received optical field is measured synchronously in each aperture pupil-plane and (2) the data collected are processed digitally in order to synthesize an image with quality corresponding to the entire aperture of the imaging system. We report the results of a numerical study including complex-field sensing strategy, digital compensation of atmospheric turbulence effects, and correction of alignment errors of the apertures.