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Appendix: Calibration Principles

An ``ideal'' interferometer samples the Fourier transform of the sky brightness multiplied by the antenna beam pattern; these samples are called visibilities. In practice, because of noise, imperfections, sampling, and other effects, several terms perturb the visibilities to produce the true output of a ``real'' interferometer. The goal of the calibration is to identify and estimate all the important instrumental and atmospheric effects and apply appropriate corrections to recover the true visibilities.


Gildas manager 2018-06-16