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\title[Grand DU]{Channel delays in the Grand Digitizer}
\date{May 31, 2022}
\author{E.T. de Boone}

\begin{document}
\frame{\titlepage}

\begin{frame}{Wireless time distribution}
	\begin{block}{Current Timing Methods}
	\begin{itemize}
		\item GNSS (online)
		\item Beacon (online/offline)
	\end{itemize}
	\end{block}
	\vspace{2em}
	\begin{itemize}
		\item GPS Accuracy $\leq 30 \mathrm{ns}$ for $95$\% time (often better)
		\item Total time accuracy in the order of 5 -- 10~ns
	\end{itemize}
	\vspace{2em}

	\begin{alertblock}{Grand Digitizer}
		\begin{itemize}
			\item Both GNSS and Beacon,
			\item Maybe test GNSS with Beacon?
		\end{itemize}
	\end{alertblock}
\end{frame}

\section{Channel Delays in the GRAND DU}
\begin{frame}{Grand DU before ADC}
	\begin{block}{Grand DU before ADC}
		\begin{itemize}
			\item Four channel ADC
			\item Per-channel Filterchain (might introduce delays)
		\end{itemize}
	\end{block}
	\begin{figure}
		\includegraphics[width=\textwidth]{grand/antenna-to-adc.pdf}
		\caption{
			Antenna to the four-channel ADC
		}
	\end{figure}
\end{frame}

\begin{frame}{Channel Delays Setup}
	\begin{block}{Channel Delay Setup}
		Single input into two channels\\
		$\mapsto$ delays due to cabling and filterchain\\
		\\
		Use correlation or phase differences to determine delay
	\end{block}
	\begin{figure}
		\includegraphics[width=\textwidth]{grand/channel-delay-setup.pdf}
		\caption{
			Single input to two channels
		}
	\end{figure}
	\begin{block}{What signal to put in?}
		\begin{itemize}
			\item Sine,  $\mapsto$ single frequency response of chain
			\item Pulse, $\mapsto$ multiple frequencies to compare
	\end{block}
\end{frame}

\begin{frame}{Channel Delays Result}
	\begin{figure}
		\includegraphics[width=\textwidth]{grand/split-cable-delays/split-cable-delays-ch1ch4.pdf}
	\end{figure}
\end{figure}

%%%%%%%%%%%%%
\section*{References}
\begin{frame}{References}
		\printbibliography
\end{frame}
\end{document}
