NDLI: Fundamental Imaging Limits of Radio Telescope Arrays

Content Provider	IEEE Xplore Digital Library
Author	Wijnholds, S.J. van der Veen, A.-J.
Copyright Year	2007
Abstract	The fidelity of radio astronomical images is generally assessed by practical experience, i.e., using rules of thumb, although some aspects and cases have been treated rigorously. In this paper, we present a mathematical framework capable of describing the fundamental limits of radio astronomical imaging problems. Although the data model assumes a single snapshot observation, i.e., variations in time and frequency are not considered, this framework is sufficiently general to allow extension to synthesis observations. Using tools from statistical signal processing and linear algebra, we discuss the tractability of the imaging and deconvolution problem, the redistribution of noise in the map by the imaging and deconvolution process, the covariance of the image values due to propagation of calibration errors and thermal noise and the upper limit on the number of sources tractable by self calibration. The combination of covariance of the image values and the number of tractable sources determines the effective noise floor achievable in the imaging process. The effective noise provides a better figure of merit than dynamic range since it includes the spatial variations of the noise. Our results provide handles for improving the imaging performance by design of the array.
Sponsorship	IEEE Signal Processing Society
Starting Page	613
Ending Page	623
Page Count	11
File Size	667220
File Format	PDF
ISSN	19324553
Volume Number	2
Issue Number	5
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2008-10-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Radio astronomy Deconvolution Calibration Noise figure Thumb Data models Frequency synthesizers Signal synthesis Signal processing Linear algebra radio astronomy dynamic range imaging noise
Content Type	Text
Resource Type	Article
Subject	Signal Processing Electrical and Electronic Engineering

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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