Lessons learned from station calibration

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Presentation transcript:

Lessons learned from station calibration Parisa Noorishad, Arnold van Ardenne and Thijs van der Hulst AAVP2011, 12th- 16th Dec. 2011 Dwingeloo- The Netherlands Parisa Noorishad AAVP2011, 12th- 16th Dec. 2011 Dwingeloo- The Netherlands

AA-station calibration (gain calibration) Aim: receivers' DI-complex gain Methods used by far: Model-based methods (covariance fitting) Holographic method Redundancy (in case of a regular array) Deterministic effects not to dismiss: Non-identical beam of the station elements Beamformed beam of the station elements (complex weights of digital beam) Beam projection/sky rotation ...

Some Demonstrations

1.1 Non-identical beams

24th Nov 2009 21:29:04 UTC, observing CasA 1.2 Non-identical beams 24th Nov 2009 21:29:04 UTC, observing CasA

2.1 Complex weights of digital beam Digital Beamforming weights f= 160MHz

2.2 Phase of DI-complex gain Tracking CasA, 24th Nov 2009 @ 22: 12: 19 UTC

2.3 Phase of DI-complex gain Tracking CygA, 28th Nov. 2009 @ 19: 55: 54 UTC

Suggestions for AA- gain calibration Not to accept any direction dependency or rapid variations over time or frequency in our gain calibration results. To know the deterministic effects (e.g. beam shape) well and separate them from the stochastic ones (e.g. correlated noise, ionosphere, etc.). To know the beam by EM-studies. To set identical beams as a figure of merit. To correct for them (especially beam effect) This hopefully leads to less variance on our parameters of interest in AA-calibration.