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\title{GNSS-Auswertung in Echtzeit}

\author{Leo\v{s} Mervart}

\institute{TU Prag}

\date{Frankfurt, Januar 2014}

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\section{PPP NB}
\subsection{Principles}

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\frametitle{Principles of PPP NB (Non-Bias) Service}
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The PPP~NB is based on the processing of the ionosphere-free linear combination of phase
observations
\be
L^{ij}_3 = \varrho^{ij} - c\delta^{ij} + T^{ij} + \bar{N}^{ij}_3 ~,
\ee 
where the ambiguity term is given by
\be
\bar{N}^{ij}_3 =  N^{ij}_3 - l^{ij}_3 
              = \frac{c\;f_2}{f^2_1-f^2_2}\;(n^{ij}_1-n^{ij}_2) + \lambda_3\;n^{ij}_1 - l^{ij}_3 
\ee
and the ionosphere-free linear combination of code observations
\be
P^{ij}_3 = \varrho^{ij} - c\delta^{ij} + T^{ij} + p^{ij}_3 ~,
\ee
where the code bias $p^{ij}_3$ is the linear combination of biases
$p^{ij}_1,p^{ij}_2$
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