Speckle imaging through the atmosphere

Details Speckle imaging through the atmosphere Speckle imaging through the atmosphere

Jul 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989sita.rept.....b&link_type=abstract

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Atmospheric Refraction, Distortion, Image Processing, Images, Imaging Techniques, Specular Reflection, Telescopes, Algorithms, Bias, Calibrating, Constraints, Observation, Photons

Scientific paper

The atmosphere is the limiting factor in high-resolution ground-based optical telescope observations of objects in space. New speckle-imaging techniques allow astronomers to overcome atmospheric distortion and achieve the goal of diffraction-limited groundbased telescope performance. Studies and experiments at Lincoln Laboratory utilize speckle imaging for observation of near-earth satellites. Thousands of separate exposures, each 2 to 5 ms in duration, are collected within a few seconds. A computationally intensive algorithm is then used to reconstruct a single diffraction-limited image from the collection of separate exposures. The image-reconstruction process effectively removes the distortion imposed by the atmosphere. Photon noise, which limits the quality of image reconstruction, must be properly compensated by the actual detector calibration.

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