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SUMMARY:Model Based Calibration and Imaging for Phased Array Radio Telesco
 pes - Stefan Wijnholds (ASTRON)
DTSTART:20110510T153000Z
DTEND:20110510T163000Z
UID:TALK30845@talks.cam.ac.uk
CONTACT:Sally Hales
DESCRIPTION:Phased arrays provide a cost effective way to provide the larg
 est collecting area required for SKA era radio telescopes operating below 
 1.4 GHz.  Time and direction dependent effects (TDDEs) can have a signific
 ant impact on the performance of these instruments due to their wide field
  of view.  These TDDEs should therefore be dealt with in an opportune mann
 er by the calibration and imaging processes.  In this presentation\, I sho
 w that a model based approach using a full array matrix formulation of the
  measurement equation provides a convenient framework to address these iss
 ues.  I show how the calibration and imaging challenges are handled in thi
 s framework and illustrate this by examples based on actual LOFAR station 
 data.  I conclude my presentation with some open issues and routes that ar
 e being explored to handle them.
LOCATION:Martin Ryle Seminar Room\, Kavli Building
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