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Scaling of data

The visibilities $ C_{ijk}$ out of the correlator are normalized in the following way to get observed visibilities on a temperature scale $ T_{ijk}$ :

$\displaystyle T_{ijk} = \frac{C_{ijk}}{\sqrt{C_{iik}C_{jjk}}} \sqrt{T_{sys}(i)T_{sys}(j)}$ (58)

In the left side of the right term, cross-correlations are normalized to the total power measured in autocorrelations (and the dependency on $ K_c$ disappears), so that a rate of correlation is measured. The right side corresponds to a conversion to $ T_a^*$ scale by multiplication by the baseline effective system temperature.

Gildas manager 2022-01-17