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According to the docs, this is what the initial_state parameter is for.

Note that this will start the respective filter, i.e. ekf_localization_node or ukf_localization_node (*) there, and not your odometry. This will still start at all zeros, as is expected for an odometric sensor.

Also note that the the estimate will deviate more and more from the actual position, as it is just incorporating odometric information and can thus not correct for errors there.

(*) I'm assuming your using one of those two nodes, due to your description and the tags you used. If this is not the case, please describe clearly which node you are using.

According to the docs, this is what the initial_state parameter is for.

Note that this will start the respective filter, i.e. ekf_localization_node or ukf_localization_node (*) there, and not your odometry. This will still start at all zeros, as is expected for an odometric sensor.

Also note that the the estimate will deviate more and more from the actual position, as it is just incorporating odometric information and can thus not correct for errors there.

(*) I'm assuming your you're using one of those two nodes, due to your title, description and the tags you used. If this is not the case, please describe state clearly which node you are using.