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diff --git a/analyse.pspdftex b/analyse.pspdftex
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+\begin{picture}(0,0)%
+\includegraphics{analyse_pspdftex}%
+\end{picture}%
+\setlength{\unitlength}{4144sp}%
+%
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diff --git a/analyse.tex b/analyse.tex
new file mode 100644
index 0000000..f738318
--- /dev/null
+++ b/analyse.tex
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+\documentclass[a4paper]{article}
+\usepackage{color,graphicx,fullpage}
+\begin{document}
+\noindent
+\begin{minipage}[t]{\linewidth}
+\begin{minipage}{.37\linewidth}
+\input{analyse.pspdftex}
+\end{minipage}
+\begin{minipage}{.63\linewidth}
+En rouge les grandeurs mesur\'ees, en bleu les grandeurs inconnues~:
+\begin{itemize}
+\item $T_{1,2}$ sont les dates des messages \'emis et re\c cus par endpoint par rapport \`a son 1-PPS~: $T_2-T_1$
+est ind\'ependant de la position du 1-PPS
+\item $T_{3,4}$ sont les dates des messages re\c cus et \'emis par gateway par rapport \`a son 1-PPS~: $T_4-T_3$
+est ind\'ependant de la position du 1-PPS
+\item $t$ est l'\'ecart entre les 1-PPS de endpoint et gateway
+\item on a $T_2-T_1=T_4-T_3+2\delta t\Leftrightarrow \delta t=\frac{1}{2}(T_4-T_3-(T_2-T_1))$ avec les
+$T_{i,\forall i}$ connus donc on d\'eduit $\delta t$
+\item on a $t+t_2=t_1+\delta t$ et on cherche \`a annuler $t$ donc on corrige $t_1$ tel que
+$t_1+\delta t-t_2=T_1+\delta t-T_3$ s'annule
+\end{itemize}
+\end{minipage}
+\end{minipage}\\
+
+LoRa a une port\'ee de 15~km ou 50~$\mu$s de temps de vol. Avec 125~kHz de bande passante on peut esp\'erer
+avoir le temps de vol \`a la microseconde en sur-\'echantillonnant le pic de corr\'elation donc compenser
+le temps de vol au-del\`a de 300~m de distance.
+\end{document}
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+2 1 0 1 0 7 50 -1 -1 0.000 0 0 -1 1 0 3
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+2 2 0 1 0 7 50 -1 -1 0.000 0 0 -1 0 0 5
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+4 0 0 50 -1 0 12 0.0000 4 180 1155 8730 6660 gateway (GW)\001
+4 0 0 50 -1 0 12 0.0000 4 135 585 9810 6930 Si5351\001
+4 0 0 50 -1 0 12 0.0000 4 135 810 10350 7155 28.8 MHz\001
+4 0 0 50 -1 0 12 0.0000 4 135 810 12555 7020 RTL-SDR\001
+4 0 0 50 -1 0 8 0.0000 4 120 105 13050 6840 Q\001
+4 0 0 50 -1 0 8 0.0000 4 90 195 12150 7110 CK\001
+4 0 0 50 -1 0 8 0.0000 4 90 210 9855 7290 I2C\001
+4 0 0 50 -1 0 8 0.0000 4 90 270 13005 7290 USB\001
+4 0 0 50 -1 0 12 0.0000 4 180 1185 10980 7650 Raspberry Pi 3\001
+4 0 0 50 -1 0 8 0.0000 4 90 195 13410 7515 SPI\001
+4 0 0 50 -1 0 12 0.0000 4 180 1125 8730 5220 endpoint (EP)\001
+4 0 0 50 -1 0 12 0.0000 4 165 780 8730 5490 (25 MHz)\001
+4 0 0 50 -1 0 12 0.0000 4 135 585 9810 5490 Si5351\001
+4 0 0 50 -1 0 12 0.0000 4 135 660 10350 5265 10 MHz\001
+4 0 0 50 -1 0 12 0.0000 4 135 810 10350 5715 28.8 MHz\001
+4 0 0 50 -1 0 12 0.0000 4 120 615 11295 5355 counter\001
+4 0 0 50 -1 0 12 0.0000 4 135 465 11970 5265 1 PPS\001
+4 0 0 50 -1 0 12 0.0000 4 135 810 12555 5580 RTL-SDR\001
+4 0 0 50 -1 0 8 0.0000 4 120 105 13050 5400 Q\001
+4 0 0 50 -1 0 8 0.0000 4 90 195 12150 5670 CK\001
+4 0 0 50 -1 0 8 0.0000 4 90 210 9855 5850 I2C\001
+4 0 0 50 -1 0 8 0.0000 4 90 270 13005 5850 USB\001
+4 0 0 50 -1 0 12 0.0000 4 180 1185 10980 6210 Raspberry Pi 4\001
+4 0 0 50 -1 0 8 0.0000 4 90 195 13410 6075 SPI\001
+4 0 4 50 -1 0 8 0.0000 4 90 1155 10125 5940 control Si5351 PLL\001
+4 0 4 50 -1 0 12 0.0000 4 135 525 11340 6795 refPPS\001
+4 0 4 50 -1 0 12 0.0000 4 135 420 8910 7605 ref10\001
+4 0 0 50 -1 0 12 0.0000 4 135 660 8820 6930 25 MHz\001
+4 0 0 50 -1 0 8 0.0000 4 90 270 10395 6930 out0\001
diff --git a/architecture.pdf b/architecture.pdf
new file mode 100644
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