Calibration of radio data

• Need for calibration.
• Quantities to be calibrated:
  • flux scale,
  • elevation,
  • phase calibration,
  • bandpasses,
  • pointing,
  • polarization,
  • fringe finders.
• The enemies:
  • troposphere,
  • ionosphere,
  • correlators,
  • severity of the problems,
  • effect on different types of array.
• Smearing:
  • choice of bandwidth and integration time.
• Useful calibration sources for each type of calibration.
• Calibration strategies.
  • Some examples for different interferometers, frequencies, types of observations.
  • Self-calibration.
• Calibration software.
  • Brief description of calibration strategies in AIPS.
  • Very brief description of calibration in CASA.