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Baseline and antennas

In equation 1, the instrumental gain is implicitely described as a product of two antenna gains:

$\displaystyle G_{ij}(t) = g_i(t) {\cdot} g_j^*(t)$ (16)

This is usually satisfied, unless averaging in time or frequency introduce a decorrelation. For a point source at the phase center, the true visibilities are constant in the uv plane with value ($ S$ ,0), where $ S$ is the source flux density, so we have a set of equations:

$\displaystyle \widetilde{V_{ij}} = g_{i} {\cdot} g_j^*S$ (17)

or equivalently:
$\displaystyle \widetilde{\varphi}_{ij} = \phi_j - \phi_i$     (18)
$\displaystyle \widetilde{a}_{ij} = a_{i} {\cdot} a_j \cdot S$     (19)



Gildas manager 2024-03-28