Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986a%26a...162..349s&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 162, no. 1-2, July 1986, p. 349-358.
Astronomy and Astrophysics
Astronomy
2
Image Processing, Interferometry, Maximum Entropy Method, Radio Sources (Astronomy), Synthetic Apertures, Astronomical Maps, Brightness Distribution, Computerized Simulation, High Resolution, Root-Mean-Square Errors
Scientific paper
An application of the Maximum Entropy Method (MEM) to the closure data is described. It is shown that although the basic principle of the method is to obtain a brightness distribution which has highest entropy, the closure phases play a prominent role in giving the correct reconstruction, especially when the distributions are complex and the measurement errors are large. The method gives faithful reconstruction for the observed random phase error of up to 150 deg. The method can be used as an alternative to the routinely used 'self-calibration' technique to improve the astronomical images obtained from the phase unstable interferometers. For large fields of view when, due to repetitive use of CLEAN, the 'self-calibration' method becomes time consuming, MEM with closure phase may have a computational advantage. For extended sources, as the performance of CLEAN deteriorates MEM could be superior to the self-calibration.
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