diff --git a/src/SAR3Q3.m b/src/SAR3Q3.m
new file mode 100644
index 0000000000000000000000000000000000000000..d2ddfcf2429710e50ed01b438c05174127be1465
--- /dev/null
+++ b/src/SAR3Q3.m
@@ -0,0 +1,20 @@
+load('signal_excitation.mat');  
+
+xe1 = xe1 / max(abs(xe1));
+xe2 = xe2 / max(abs(xe2));
+
+
+[acor1, lag1] = xcorr(xe1, 'coeff');
+[acor2, lag2] = xcorr(xe2, 'coeff');
+
+
+figure;
+subplot(2,1,1);
+plot(lag1, acor1);
+title('Autocorrélation de xe1');
+xlabel('Décalage'); ylabel('Corrélation');
+
+subplot(2,1,2);
+plot(lag2, acor2);
+title('Autocorrélation de xe2');
+xlabel('Décalage'); ylabel('Corrélation');