Update launch file

launch/ana_odom.launch

-<?xml version="1.0" encoding="UTF-8"?>
+<?xml version="1.0"?>
+<!-- -->
 <launch>
-  <arg name="config_file" default="$(find iri_ana_odom)/config/ana_odom.yaml" />
-  <arg name="node_name" default="ana_odom" />
-  <arg name="output" default="log" />
+
+  <arg name="ns"            default="robot" />
+  <arg name="config_file"   default="$(find iri_ana_odom)/config/params.yaml" />
+  <arg name="output"        default="log" />
   <arg name="launch_prefix" default="" />
 
-  <node pkg="iri_ana_odom"
-        type="iri_ana_odom"
-        name="$(arg node_name)"
-        output="$(arg output)"
-        launch-prefix="$(arg launch_prefix)">
-     <rosparam file="$(arg config_file)" command="load" />
-  </node>
-</launch>
+  <group ns="$(arg ns)">
+    
+    <node pkg ="iri_ana_odom"
+          type="iri_ana_odom"
+          name="ana_odom"
+          output="$(arg output)"
+          launch-prefix="$(arg launch_prefix)">
+      <rosparam file="$(arg config_file)" command="load" />
+    </node>
+    
+  </group>
+
+</launch>
\ No newline at end of file