Pre- and post-detection correction of turbulence-induced space-variant blur

Details Pre- and post-detection correction of turbulence-induced space-variant blur Pre- and post-detection correction of turbulence-induced space-variant blur

Nov 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000spie.4125..131t&link_type=abstract

Proc. SPIE Vol. 4125, p. 131-139, Propagation and Imaging through the Atmosphere IV, Michael C. Roggemann; Ed.

Astronomy and Astrophysics

Astronomy

Scientific paper

Space-variant blur occurs when imaging through volume turbulence over sufficiently large fields of view. Space- variant effects are particularly severe in horizontal-path imaging, slant-path (air-to-ground or ground-to-air) geometries, and ground-based imaging of low-elevation satellites or astronomical objects. In these geometries, the isoplanatic angle can be comparable to or even smaller than the diffraction-limited resolution angle. Clearly, space-invariant methods used in conjunction with mosaicing will fail in this regime. Our approach to this problem has been to generalize the method of Phase-diverse Speckle (PDS) by using a physically motivated distributed phase-screen model to accomplish both pre- and post-detection correction. Previously reported simulation results have demonstrated the reconstruction of near diffraction-limited imagery using imagery which was severely degraded by space-variant blur. In this paper, we present a novel adaptation of the space- variant PDS scheme for use as a beacon-less wavefront sensor in a multi-conjugate AO system when imaging extended scenes. We then present results of simulation experiments demonstrating that this multi-conjugate AO-compensation scheme is very effective in improving the quality and resolution of collected imagery.

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