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Proceedings Paper

Neural network for modal compensation of atmospheric turbulence
Author(s): Peter Wintoft; Guang-Ming Dai
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Paper Abstract

In modal compensation of atmospheric turbulence using Zernike polynomials, aliasing has been found to be serious for large sub- aperture configurations. In order to reduce the influence of aliasing on the residual error after modal correction, we have trained a neural network (NN) using simulated array images from a modified Hartmann- Shack wavefront sensor. The array images are derived from simulated atmospheric wavefronts following Kolmogorov turbulence. We find that Zernike coefficients predicted by the NN are more accurate than conventional methods. Using the first 28 Zernike modes, the residual error after modal-NN correction is nearly halved compared to what is obtained with a least-squares solution. In addition, the computation time using the NN is well suitable for real-time application.

Paper Details

Date Published: 30 September 1994
PDF: 7 pages
Proc. SPIE 2302, Image Reconstruction and Restoration, (30 September 1994); doi: 10.1117/12.188065
Show Author Affiliations
Peter Wintoft, Lund Observatory (Sweden)
Guang-Ming Dai, Lund Observatory (Sweden)

Published in SPIE Proceedings Vol. 2302:
Image Reconstruction and Restoration
Timothy J. Schulz; Donald L. Snyder, Editor(s)

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