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\begin{equation}\label{eq:system_equivalent_flux_density}  SEFD = {\frac{T_{sys}}{\frac{\eta_a A}{2k_B}}}  \end{equation}  where $T_{sys}$ is the system temperature including contributions from receiver noise, feed losses, spillover, atmospheric emission, galactic background and cosmic background, $k_B = 1.380 \times 10^{-23}$ Joule $K^{-1}$ is the Boltzmann constant, $A$ is the antenna collecting area, and $\eta_a$ is the antenna efficiency with $\eta_a = \eta_{surface} \eta_{\text{surface efficiency}}  \cdot \eta_{text{blockage}} \eta_{\text{aperture blockage}}  \cdot \eta_{spillover} \eta_{\text{feed spillover efficiency}}  \cdot \eta_{taper}$ \eta_{\text{illumination taper efficiency}}$  (\citet*{antenna}). \subsection{Minimize Operations Costs}  The operations cost is a complex problem divided in the sub-problems in this section.  \subsubsection{Minimize Maintenance Costs} 
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