Visibility

$$ \mathbf{V}_{pq}(u,v,t,\nu) = \mathbf{G}_p \left[ \iint\limits_{lm} \mathbf{E}_p \ \mathbf{B} \ e^{-2\pi i(ul+vm)} \mathbf{E}_q^H\ dl\ dm \right] \mathbf{G}_q^H $$

$$ \mathbf{B}(l,m,t,\nu) = \begin{pmatrix} I+Q & U+iV \\ U-iV & I-Q \end{pmatrix} $$

$$ \mathbf{E}_p(l,m,t,\nu) = \begin{pmatrix} E_{xx} & E_{xy} \\ E_{yx} & E_{yy} \end{pmatrix} $$