High-dynamic range interferometric astronomical imaging in the presence of direction dependent effects

S. Bhatnagar

doi:10.1117/12.929957

15 October 2012 High-dynamic range interferometric astronomical imaging in the presence of direction dependent effects

S. Bhatnagar

Proceedings Volume 8500, Image Reconstruction from Incomplete Data VII; 85000M (2012) https://doi.org/10.1117/12.929957
Event: SPIE Optical Engineering + Applications, 2012, San Diego, California, United States

Abstract

Modern high sensitivity radio interferometric telescopes use ultra wide-band receivers on a large number of antenna elements to achieve the capability of imaging dynamic ranges in excess of 1:1,000,000. In practice, the imaging performance is limited by instrumental and ionospheric/atmospheric effects that corrupt the recorded data. Many of these effects are directionally dependent and vary with time and frequency. Correcting for them is therefore fundamentally more difficult and these effects have been ignored in classical image reconstruction algorithms. Few attempts in the past to correct for these effects in the image-domain did not deliver the required accuracy. Recent developments in new algorithms that can account for such direction dependent effects show promising results. In this paper I give a general mathematical description of these techniques, show that the resulting algorithms are more optimal in terms of imaging performance and computing requirements and show some results.

Citation Download Citation

S. Bhatnagar "High-dynamic range interferometric astronomical imaging in the presence of direction dependent effects", Proc. SPIE 8500, Image Reconstruction from Incomplete Data VII, 85000M (15 October 2012); https://doi.org/10.1117/12.929957

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KEYWORDS

Antennas

Data modeling

Polarization

Transform theory

Image processing

Reconstruction algorithms

Telescopes

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