Shadow Imaging of Geostationary Satellites: silhouette reconstruction from accurate polychromatic modelling of diffraction and atmospheric disturbances
Résumé
Shadow imaging is a very promising technique for imaging the silhouette of geostationary satellites at submetric resolutions from the ground. The method is based on the numerical inversion of the shadow cast by the satellite when it occults a star. We have built an inversion algorithm based both on a fine physical modelling of light propagation, and that makes full use of the polychromatic flux of the star. We conducted several simulations to show a few realistic working examples, giving special attention to shadow sampling. We also proved that the chromatic inversion allows for a considerable improvement in the reconstruction.
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