Solving for Calibration — Bandpass, Gain, Polarization

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4.4 Solving for Calibration — Bandpass, Gain, Polarization

These tasks actually solve for the unknown calibration parameters, placing the results in a calibration table. They take as input an MS, and a number of parameters that specify any prior calibration or previous calibration tables to pre-apply before computing the solution. These are placed in the proper sequence of the Measurement Equation automatically.

We first discuss the parameters that are in common between many of the calibration tasks. Then we describe each solver in turn.

  4.4.1 Common Calibration Solver Parameters
   4.4.1.1 Parameters for Specification : vis and caltable
   4.4.1.2 Selection: field, spw, selectdata, intent, and observation
   4.4.1.3 Prior Calibration and Correction: parang, gaincurve and opacity
   4.4.1.4 Previous Calibration: gaintable, gainfield, interp and spwmap
   4.4.1.5 Solving: solint, combine, preavg, refant, minblperant, minsnr
   4.4.1.6 Action: append and solnorm
  4.4.2 Spectral Bandpass Calibration (bandpass)
   4.4.2.1 Bandpass Normalization
   4.4.2.2 B solutions
   4.4.2.3 BPOLY solutions
  4.4.3 Complex Gain Calibration (gaincal)
   4.4.3.1 Polarization-dependent Gain (G)
   4.4.3.2 Polarization-independent Gain (T)
   4.4.3.3 GSPLINE solutions
   4.4.3.4 Antenna Delays — ’K’ solutions
   4.4.3.5 Cross-Hand Delays — ’KCROSS’ solutions
  4.4.4 Establishing the Flux Density Scale (fluxscale)
   4.4.4.1 Using Resolved Calibrators
  4.4.5 Instrumental Polarization Calibration (D,X)
   4.4.5.1 Heuristics and Strategies for Polarization Calibration
   4.4.5.2 A Note on channelized polarization calibration
   4.4.5.3 A Polarization Calibration Example
  4.4.6 Baseline-based Calibration (blcal)

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