Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978apopt..17..337f&link_type=abstract
Applied Optics, vol. 17, Feb. 1, 1978, p. 337-347. ERDA-NASA-sponsored research.
Astronomy and Astrophysics
Astronomy
151
Apertures, Image Processing, Imaging Techniques, Synthetic Arrays, Angular Resolution, Computerized Simulation, Correlation Detection, Point Sources, Random Processes, Redundancy, Sidelobes, Signal To Noise Ratios, Tomography, X Ray Astronomy
Scientific paper
The paper discusses uniformly redundant arrays (URA) as applied to coded aperture imaging. The URA system offers the high-transmission characteristics of random arrays as well as a flat sidelobe advantage. The high-transmission yields the imaging of very low-intensity sources and the flat sidelobes provide the suppression of inherent noise which obscures low-contrast sources. Simulations have shown that the URA with shot and background noise produces a better reconstructed object than random arrays without shot or background noise. The URA also offers an arrangement which involves a mosaic of basic URA patterns forming a circular correlation of the object on the picture plane. Thus the information needed to reconstruct the object is contained in an area equal to that of the basic aperture pattern. This smaller required detector is important in applications including X-ray astronomy.
Cannon T. M.
Fenimore Edward E.
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