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Roll Deconvolution Of Space Telescope Data: Inverse Filtering Of Two Speckle Interferograms

Roll deconvolution is a speckle method that can improve the resolution of the 2.4m Hubble Space Telescope (HST) at short UV wavelengths. A diffraction-limited image can digitally be reconstructed from two degraded images recorded at two different roll angles of the HST. The reconstruction is performed by complex inverse filtering of the two degraded images. In digital simulations we have investigated how the signal-to-noise ratio of the reconstruction depends on photon noise (104 to 50 photon counts per pixel), on the structure and size of the point spread function (caused by aberrations) and other parameters.