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\usepackage{mathtools}  \section{Overview}  This document presents a parametric model to help design an aperture synthesis array. Interferometric Array.  It describes the relationship of design parameters in section 2 with performance objectives in section 3. In particular, this document focus in providing a quick guide to understand the parameter and objectives selection for the reader to both assess completeness of the model, and accuracy of the mathematical relationships as well.  Section 4 provides the python code used to generate a table in the format required to perform a visual analysis of the performance of different arrays generated by the model. The python code is consistent with parameters and objectives selection, and the mathematical relationships between them.  \section{Design Variables} 
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\subsection{Engineering cost vs. Calibration cost}  Tricky because you can compensate antenna quality with software. So the equations must capture this trade off.  \section{References}  \begin{thebibliography}{9}  \bibitem{latexcompanion}   Michel Goossens, Frank Mittelbach, and Alexander Samarin.   \textit{The \LaTeX\ Companion}.   Addison-Wesley, Reading, Massachusetts, 1993.    \bibitem{einstein}   Albert Einstein.   \textit{Zur Elektrodynamik bewegter K{\"o}rper}. (German)   [\textit{On the electrodynamics of moving bodies}].   Annalen der Physik, 322(10):891–921, 1905.    \bibitem{knuthwebsite}   Knuth: Computers and Typesetting,  \\\texttt{http://www-cs-faculty.stanford.edu/\~{}uno/abcde.html}  \end{thebibliography}  \begin{itemize}  \item Towards cost equation for a multi-element array - http://www.aoc.nrao.edu/evla/geninfo/memoseries/evlamemo29.ps.gz  \item Cost Equation for a Millimetre Wave Array - http://library.nrao.edu/public/memos/alma/memo006.pdf 
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