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Impact of IMU Position on Localization

asked 2020-12-13 13:39:27 -0500

west2788
3 ●1 ●1 ●3

This is the first time I'm using an IMU (Bosch BNO055) on a mobile base. The IMU provides absolute orientation, angular velocity and angular acceleration. I'm planning to use the robot_localization package to fuse this data with wheel encoder data. Even though I did a bunch of searching and reading, I'm still not clear to which extent the position of the IMU on my mobile base can be accounted for. I know that angular velocity and acceleration will differ from the actual values of the base if the IMU is not aligned with the movement axis of the base. Is there a simple way to calculate the actual values if, for example, I were to place the IMU in the right front corner of my mobile base as opposed to the center?

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answered 2020-12-13 15:58:06 -0500

chfritz

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You can mount it anywhere you want, as long as you accurately describe its pose relative to the frame you want to track (base_link_frame in robot_localization). That pose description will go into your TF tree and can be provided either by running static transforms nodes or, better, via a URDF interpreted by robot_state_publisher.

Now whether or not you can accurately measure the pose in relation to your base_link (or whichever frame you want to use for tracking) is a different story. Ideally this should be calibrated (read: computed from measurements by the sensors itself and ground truth), rather than measured geometrically or derived from a model, since the latter will always have errors.

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Asked: 2020-12-13 13:39:27 -0500

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Last updated: Dec 13 '20

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Impact of IMU Position on Localization