How to configure properly robot_localization with IMU, Odometry and GPS data
Hello everyone! I'm new to ROS, and I'm working with robotlocalization package (2D mode) on Melodic. I'm using an IMU, Odometry and GPS data. I've configured robotlocalization using two EKF and navsattransformnode.
- The first EKF has odom as world_frame, and IMU and Odometry as subscribers;
- The second EKF has map as world_frame, and IMU, Odometry and /odometry/gps as subscribers;
- Navsattransformnode has GPS, IMU and /odometry/filtered_map as subscribers.
I'm using IMU sensor from my smartphone, through the Android app Ros Sensors Driver.
I was wondering if I were setting right all the nodes: /odometry/filtered looks like it's working, but I was noticing that there is no difference in the results if I use only the odometry and the Imu, without the gps data... How is it possible? I've also noticed that the covariance matrix of /odometry/filtered is diverging fairly quickly, and I don't know how to reduce this divergence. Can anyone give me some advice? Here are the launch files.
<launch>
<param name="/use_sim_time" value="true" />
<node pkg="tf2_ros" type="static_transform_publisher" name="bl_imu" args="-0.06 0 0.1376 0.385 0.018 -0.010 base_link imu_link" />
<node pkg="tf2_ros" type="static_transform_publisher" name="bl_gps" args="0.18 0.13 0.1476 0 0 0 base_link gps_link" />
<node name="ekf_localization_node" pkg="robot_localization" type="ekf_localization_node" clear_params="true">
<param name="frequency" value="30"/>
<param name="sensor_timeout" value="0.1"/>
<param name="two_d_mode" value="true"/>
<param name="map_frame" value="map"/>
<param name="odom_frame" value="odom"/>
<param name="base_link_frame" value="base_link"/>
<param name="world_frame" value="odom"/>
<param name="transform_time_offset" value="0.0"/>
<param name="transform_timeout" value="0.0"/>
<param name="odom0" value="/wolf/odom"/>
<param name="imu0" value="/wolf/imu"/>
<rosparam param="odom0_config">[false, false, false,
false, false, true,
true, true, true,
false, false, false,
false, false, false]</rosparam>
<rosparam param="imu0_config">[false, false, false,
true, true, true,
false, false, false,
true, true, true,
true, true, true]</rosparam>
<param name="odom0_differential" value="false"/>
<param name="imu0_differential" value="false"/>
<param name="odom0_relative" value="false"/>
<param name="imu0_relative" value="true"/>
<param name="imu0_remove_gravitational_acceleration" value="true"/>
<param name="print_diagnostics" value="true"/>
<param name="odom0_queue_size" value="10"/>
<param name="imu0_queue_size" value="10"/>
<param name="debug" value="false"/>
<param name="debug_out_file" value="debug_ekf_localization.txt"/>
<rosparam param="process_noise_covariance">[0.05, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0.05, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0.06, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0.03, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0.03, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0.06, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0.025, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0.025, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0.04, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0.01, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0.01, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0.02, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0.01, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0.01, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0.015]</rosparam>
<rosparam param="initial_estimate_covariance">[1e-9, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 1e-9, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 1e-9, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 1e-9, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 1e-9, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 1e-9, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 1e-9, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 1e-9, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 1e-9, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 1e-9, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1e-9, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1e-9, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1e-9, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1e-9, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1e-9]</rosparam>
</node>
<node name="ekf_localization_node_map" pkg="robot_localization" type="ekf_localization_node" clear_params="true">
<param name="frequency" value="30"/>
<param name="sensor_timeout" value="0.1"/>
<param name="two_d_mode" value="true"/>
<param name="map_frame" value="map"/>
<param name="odom_frame" value="odom"/>
<param name="base_link_frame" value="base_link"/>
<param name="world_frame" value="map"/>
<param name="transform_time_offset" value="0.0"/>
<param name="transform_timeout" value="0.0"/>
<param name="odom0" value="/wolf/odom"/>
<param name="odom1" value="/odometry/gps"/>
<param name="imu0" value="/wolf/imu"/>
<rosparam param="odom0_config">[false, false, false,
false, false, true,
true, true, true,
false, false, false,
false, false, false]</rosparam>
<rosparam param="odom1_config">[ true, true, true,
false, false, false,
true, true, true,
false, false, false,
false, false, false]</rosparam>
<rosparam param="imu0_config">[false, false, false,
true, true, true,
false, false, false,
true, true, true,
true, true, true]</rosparam>
<param name="odom0_differential" value="false"/>
<param name="odom1_differential" value="false"/>
<param name="imu0_differential" value="false"/>
<param name="odom0_relative" value="false"/>
<param name="odom1_relative" value="false"/>
<param name="imu0_relative" value="true"/>
<param name="imu0_remove_gravitational_acceleration" value="true"/>
<param name="print_diagnostics" value="true"/>
<param name="odom0_queue_size" value="10"/>
<param name="odom1_queue_size" value="10"/>
<param name="imu0_queue_size" value="10"/>
<param name="debug" value="false"/>
<param name="debug_out_file" value="debug_ekf_localization.txt"/>
<rosparam param="process_noise_covariance">[0.05, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0.05, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0.06, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0.03, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0.03, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0.06, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0.025, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0.025, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0.04, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0.01, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0.01, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0.02, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0.01, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0.01, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0.015]</rosparam>
<rosparam param="initial_estimate_covariance">[1e-9, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 1e-9, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 1e-9, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 1e-9, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 1e-9, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 1e-9, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 1e-9, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 1e-9, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 1e-9, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 1e-9, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1e-9, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1e-9, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1e-9, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1e-9, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1e-9]</rosparam>
<remap from="/odometry/filtered" to="/odometry/filtered_map"/>
</node>
<node pkg="robot_localization" type="navsat_transform_node" name="navsat_transform_node" clear_params="true" respawn="true">
<param name="frequency" value="30"/>
<param name="magnetic_declination_radians" value="0.0698132"/>
<param name="yaw_offset" value="0.385"/>
<param name="zero_altitude" value="true"/>
<param name="broadcast_utm_transform" value="true"/>
<param name="publish_filtered_gps" value="true"/>
<param name="use_odometry_yaw" value="false"/>
<param name="wait_for_datum" value="true"/>
<rosparam param="datum">[41.158066, 16.773167, 0]</rosparam>
<remap from="/odometry/filtered" to="/odometry/filtered_map"/>
<remap from="/gps/fix" to="/wolf/gps"/>
<remap from="/imu/data" to="/wolf/imu"/>
</node>
</launch>
Thank you all in advance!
Asked by romiao on 2019-06-10 10:04:22 UTC
Answers
Have you tried this one: http://docs.ros.org/melodic/api/robot_localization/html/index.html This seems to be in enough details to help you catch up with your question. But my understanding is that they do have the same localisation information result, on reason is they try to help improve the localization final result by combing information (for instance GPS has some advantages)
Asked by cassini.huygens on 2019-06-17 20:16:40 UTC
Comments
Just making sure: there are hundreds of Q&As about
robot_localization, including posts about GPS, odometry and IMU configurations. Have you found and looked at those?Asked by gvdhoorn on 2019-06-12 02:39:57 UTC
Yes I've read a lot of Q&A about this package, and it's thanks to those informations that I managed to configure the two EKFs and navsat_transform_node... I just don't understand why /odometry/filtered releases the same localization informations if I use GPS, IMU and Odom, or if I use only IMU and Odom...
Asked by romiao on 2019-06-12 02:56:29 UTC