Spectro-imagery with a Rotating Slip-Aperture Telescope (RSAT): Cophasing successive projections in the radon plane

Details Spectro-imagery with a Rotating Slip-Aperture Telescope (RSAT): Cophasing successive projections in the radon plane Spectro-imagery with a Rotating Slip-Aperture Telescope (RSAT): Cophasing successive projections in the radon plane

Dec 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992esasp.354..197t&link_type=abstract

In ESA, Targets for Space-Based Interferometry p 197-200 (SEE N93-31750 12-89)

Mathematics

Astronomical Interferometry, Image Reconstruction, Imaging Techniques, Spectrographs, Synthetic Apertures, Telescopes, Computerized Simulation, Coupling, Images, Real Time Operation, Transformations (Mathematics), Vibration Effects

Scientific paper

The interest of a Rotating Slit Aperture Telescope (RSAT) among other synthetic aperture telescopes, its capability of being easily coupled with a spectrograph in order to give reconstructed images of an astronomical object as a function of the light wavelength, is discussed. The principle of image reconstruction is considered: it consists of the inversion of the set of projections (Radon transform) given by the telescope during its rotation. One of the main difficulties in the reconstruction process in space may come from the jitter of the rotation axis of the RSAT. A numerical simulation to study the effect of motion of the rotation axis is presented. For this goal, simulations of reconstructed images are given when the rotation axis is moved during the observation; two kinds of objects are considered: first, the object is a point source and secondly the object is a galaxy (M51). A possible way to overcome this limitation consists in the evaluation, in real time, of the motion of the axis of rotation by means of a very small secondary telescope.

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