Element gain drifts as an imaging dynamic range limitation in PAF-based interferometers

Details Element gain drifts as an imaging dynamic range limitation in PAF-based interferometers Element gain drifts as an imaging dynamic range limitation in PAF-based interferometers

2011-10-13

arxiv.org/abs/1110.2914v1

Astronomy and Astrophysics

Astrophysics

Instrumentation and Methods for Astrophysics

4 pages, 3 figures, poster presentation at the XXX URSI General Assembly and Scientific Symposium (Istanbul, Turkey, August 13

Scientific paper

Interferometry with phased-array feeds (PAFs) presents new calibration challenges in comparison with single-pixel feeds. In particular, temporal instability of the compound beam patterns due to element gain drifts (EGDs) can produce calibration artefacts in interferometric images. To translate imaging dynamic range requirements into PAF hardware and calibration requirements, we must learn to relate EGD levels to imaging artefact levels. We present a MeqTrees-based simulations framework that addresses this problem, and apply it to the APERTIF prototype currently in development for the WSRT.

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