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/dokumenty/skolni/PDS/ionosfericky_spoj/Santa_clara_Prague.png
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/dokumenty/skolni/PDS/ionosfericky_spoj/vypocet.aux
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/dokumenty/skolni/PDS/ionosfericky_spoj/vypocet.pdf
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/dokumenty/skolni/PDS/ionosfericky_spoj/vypocet.tex
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\begin {table}[tbp]
\begin {center}
\begin{tabular}{|l|l|}
\hline
\multicolumn{ 2}{|c|}{\Large \bfseries Pozemní a družicové spoje \huge\strut} \\ \hline
\textbf{Datum měření:} {28.11.2012} & \textbf{Jméno:} {Jakub Kákona} \\ \hline
\textbf{Pracovní skupina:} {} & \textbf{Hodina:} {St 14:30} \\ \hline
\textbf{Spolupracovníci: } {} & \textbf{Hodnocení:} \\ \hline
\end{tabular}
\end {center}
\end {table}
 
\begin{center} \Large{Návrh ionosférického spoje} \end{center}
 
\begin{abstract}
\end{abstract}
 
\subsection*{Zadání}
 
Naplánovat ionosférické spojení mezi Prahou (50.10 N, 14.43 E) a pracovištěm, které se nachází na osamělé radiové stanici na jiné části zeměkoule Santa Clara (Cuba) 22,42 N 79,97 W. Tento spoj by měl být provozován s EIRP = 15 dBW v období listopadu 2012. Vaším úkolem je:
 
\begin{enumerate}
\item určit zeměpisné parametry spoje, polohy míst odrazu od ionosféry a stanovit možné módy šíření
\item nalézt časové závislosti hodnot kritických kmitočtů jednotlivých vrstev ionosféry pro dané virtuální body
odrazu
\item stanovit provozní MUF celého spoje a FOT (OWT), pokud máte možnost během celého dne provozovat spojení na třech různých kmitočtech
\end{enumerate}
 
\section{Výsledky výpočtu}
 
\subsection{Určení zeměpisných parametrů spoje}
 
Po dosazení do výrazů pro výpočet sférické vzdálenosti. Zjistíme, že vzdálenost mezi vysílačem v Praze a přijímačem v Santa Clara je přibližně 8430 km.
 
\subsection{Určení způsobu šíření}
 
Sférická vzdálenost je větší, než 4000km, bude proto docházet k šíření odrazy od ionosféry. Zároveň ale není podstatně větší, než 8000km. Bude proto pravděpodobně docházet ke dvěma odrazům v místech se středními souřadnicemi:
38 N 52 W a 46 N 16 W
 
\subsection{Kritické kmitočty v místech odrazu}
 
Pro jednotlivé odrazné plochy vychází MUF 26,23 MHz a 26,86 MHz.
 
Provozní MUF spoje by tedy byl 26,23 MHz což ale není frekvence optimální pro vysílání.
 
\begin{figure}
\begin{center}
\includegraphics [width=150mm] {./Santa_clara_Prague.png}
\caption{Spolehlivost spoje během listopadu v závislosti na frekvenci}
\end{center}
\label{utlum_chodba}
\end{figure}
 
Z vypočítaných dat pak můžeme určit, že FOT pro časy 0-10 UT je 9,53MHz, následně pro časy 11-18 UT 24,36 MHz mezi časy 18-21 UT je komunikační díra a dále navazuje opět optimální frekvence 9,53 MHz.
 
\end{document}