Model Based Calibration and Imaging for Phased Array Radio Telescopes

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• Stefan Wijnholds (ASTRON)
• Tuesday 10 May 2011, 16:30-17:30
• Martin Ryle Seminar Room, Kavli Building.

If you have a question about this talk, please contact Sally Hales.

Phased arrays provide a cost effective way to provide the largest collecting area required for SKA era radio telescopes operating below 1.4 GHz. Time and direction dependent effects (TDDEs) can have a significant impact on the performance of these instruments due to their wide field of view. These TDD Es should therefore be dealt with in an opportune manner by the calibration and imaging processes. In this presentation, I show that a model based approach using a full array matrix formulation of the measurement equation provides a convenient framework to address these issues. I show how the calibration and imaging challenges are handled in this framework and illustrate this by examples based on actual LOFAR station data. I conclude my presentation with some open issues and routes that are being explored to handle them.

This talk is part of the Cavendish Astrophysics Seminars series.

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