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Other calibration procedures

Baseline-based calibration


Sometimes we have difficulties to have antenna-based calibration solutions. In almost all the cases this can be solved by finding the origin of the problem, often due to the presence of corrupted data. If the difficulties are found to be due to baseline-dependent problems, for instance related to the correlator, to the atmosphere, etc, it may be better to calibrate in baseline-based mode. In that case the hpb Fild must be created by using the CLIC command ``copy header base'' instead of ``copy header antenna'' (the default in Sect. [*]). The baseline-based solution can be then obtained by defining ``set rf/ phase/ amplitude baseline'' before solving and storing. Antenna-based solutions can be also stored in these hpb files by using ``set rf/ phase/ amplitude antenna'', followed by solve and store. Note that the last solution stored is the one considered by default. Get in contact with your local contact for a more detailed explanation if needed.


Self-calibration


Self-calibration can be performed by selecting ``Self-cal on point source'' in the CLIC menu (Fig. [*]), with a procedure similar to that here described for a ``Standard Calibration'' that includes also the source correlations.


next up previous contents
Next: Data quality assessment Up: Standard Calibration Previous: FAQ   Contents
Gildas manager 2014-07-01