next up previous contents
Next: Data calibration Up: Description of the calibration Previous: Skydips and determination of   Contents

Load calibration and determination of the zenith opacity

The hot and cold load as well as the atmosphere in a region devoid of signal are measured in turn. From Eq. 2, it is easy to show that

\end{displaymath} (11)

where From this equation, we deduce \ensuremath{T_\ensuremath{\mathrm{sky}}\ifthenelse{\equal{tot}{}}{}{^\ensuremath{\mathrm{tot}}}}. Using an atmospheric model and Eqs. 7-9, the total opacity of the atmosphere at signal and image frequencies are then fitted.

Gildas manager 2014-07-01