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Thesis: removing invalid Todos
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2 changed files with 3 additions and 11 deletions
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@ -38,18 +38,16 @@ This chapter starts an investigation into these systematic delays within \gls{GR
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% ADC
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At the base of every single antenna, a \gls{DU} is mounted.
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%The \gls{DU} (see Figure~\ref{fig:grand_du}), at the base of every single antenna, is the workhorse of \gls{GRAND}.\Todo{rephrase}
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Its protective encasing has three inputs to which the different polarisations of the antenna are connected.
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These inputs are connected to their respective filterchains, leaving a fourth filterchain as spare.
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Each filterchain bandpasses the signal between $30\MHz$ and $200\MHz$.
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Finally, the signals are digitised by a four channel 14-bit \gls{ADC} sampling at $500\MHz$.
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%The input voltage ranges from $-900\mV$ to $+900\mV$.
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In our setup, the channels are read out after one of two internal ``monitoring'' triggers fire.
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%The ten-second trigger (TD) is linked to the \gls{1PPS} of the \gls{GNSS} chip.
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In our setup, the channels are read out after one of two internal ``monitoring'' triggers fire with the ten-second trigger (TD) linked to the \gls{1PPS} of the \gls{GNSS} chip and the other (MD) a variable randomising trigger.
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\\
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% timestamp = GPS + local oscillator
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%The \gls{DU} timestamps an event using a combination of the 1\gls{PPS} of a Trimble ICM 360 \gls{GNSS} chip\Todo{ref?} and counting the local oscillator running at $500\MHz$.
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%The \gls{DU} timestamps an event using a combination of the 1\gls{PPS} of a Trimble ICM 360 \gls{GNSS} chip and counting the local oscillator running at $500\MHz$.
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%At trigger time, the counter value is stored to obtain a timing accuracy of roughly $2\ns$.
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%The counter is also used to correct for fluctuating intervals of the 1\gls{PPS} by storing and resetting it at each incoming 1\gls{PPS}.
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@ -77,7 +77,6 @@ Note that the period mismatch term $\Delta k_{ij}$ in \eqref{eq:synchro_mismatch
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% \includegraphics[width=\textwidth]{beacon/08_beacon_sync_synchronised_period_alignment.pdf}
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% \caption{
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% Lifting period degeneracy ($k=n-m=7$ periods) using the optimal overlap between impulsive signals.
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% \protect\Todo{note misaligned overlap due to different locations}
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% }
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% \label{fig:beacon_sync:period_alignment}
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% \end{subfigure}
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@ -91,10 +90,6 @@ Note that the period mismatch term $\Delta k_{ij}$ in \eqref{eq:synchro_mismatch
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% \subref{fig:beacon_sync:period_alignment}: Expecting the impulsive signals to come from the same source, the overlap between the two impulsive signals is used to lift the period degeneracy ($k=n-m$).
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% }
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% \label{fig:beacon_sync:sine}
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% \protect\Todo{
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% Redo figure without xticks and spines,
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% rename $\Delta \tClockPhase$
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% }
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\end{figure}%>>>
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% Same transmitter / Static setup
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@ -253,7 +248,6 @@ At each location, after removing propagation delays, each waveform and the refer
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\footnote{%<<<
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Note that one could use a correlation method instead of a maximum to select the best time delay.
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However, for simplicity and ease of computation, this has not been implemented.
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%\Todo{incomplete p}
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%As shown in Figure~\ref{fig:single:annotated_full_waveform}, the air shower signal has a length in the order of a few nanoseconds.
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%Since it is this peak that is of interest, it would have been possible to cut the waveforms such to only correlate the peaks.
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} %>>>
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@ -346,7 +340,7 @@ The restriction of the possible delays is therefore important to limit the numbe
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\\
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% fall in local extremum, maximum
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In this analysis, the initial grid is defined as $8^\circ$ wide around the true axis.\Todo{why?}
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In this analysis, the initial grid is defined as $8^\circ$ wide around the true axis.
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As the number of computations scales linearly with the number of grid points ($N = N_x N_y$), it is favourable to minimise the number of grid locations.
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Unfortunately, the above process has been observed to fall into local maxima when a too coarse initial grid ($N_x < 13$ at $X=400\,\mathrm{g/cm^2}$) was used while restricting the time delays to $\left| k \right| \leq 3$.
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\\
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