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Here is an example of it being done with two nodes of the type ekf_localization_node:

https://github.com/cra-ros-pkg/robot_localization/blob/melodic-devel/launch/dual_ekf_navsat_example.launch

Put different names on each node as seen in the example above.

What type of node are you trying to launch? Might be other conflicts.

Here is an example of it being done with two nodes of the type ekf_localization_node:

https://github.com/cra-ros-pkg/robot_localization/blob/melodic-devel/launch/dual_ekf_navsat_example.launch

<launch>

  <rosparam command="load" file="$(find robot_localization)/params/dual_ekf_navsat_example.yaml" />

  <node pkg="robot_localization" type="ekf_localization_node" name="ekf_se_odom" clear_params="true"/>

  <node pkg="robot_localization" type="ekf_localization_node" name="ekf_se_map" clear_params="true">
    <remap from="odometry/filtered" to="odometry/filtered_map"/>
  </node>

  <node pkg="robot_localization" type="navsat_transform_node" name="navsat_transform" clear_params="true">
    <remap from="odometry/filtered" to="odometry/filtered_map"/>
  </node>

</launch>

Put different names on each node as seen in the example above.

What type of node are you trying to launch? Might be other conflicts.