How to convert IMU data to quaternion orientation

asked 2018-03-20 11:40:05 -0500

Robbe_C
23 ●2 ●4 ●5

Hello

I'm trying to fuse my IMU data (and GPS data) with the package robot_localization. Therefore, I have to put my IMU data into a sensor_msgs/Imu message. I know it is possible to convert my IMU data (accelerometer, gyroscope and magnetometer) into a quaternion orientation message. However, I wonder if there is a package available to do this transformation for me, or do I have to write code myself? If so, how would I start?

Thanks in advance! Kind regards Robbe

answered 2018-03-20 13:33:33 -0500

stevejp

929 ●1 ●8 ●18

Just to clarify - you are not converting your accelerometer / gyros / magnetometer measurements into an orientation, you are using those raw measurements to estimate your orientation. The madgwick and complementary filter are both capable of doing exactly what you need.

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The robot_localization package that the OP originally suggested can also do this.

ahendrix ( 2018-03-20 14:14:37 -0500 )edit

@ahendrix I didn't think robot_localization dealt directly with magnetometer measurements. Can you explain how you would do this?

stevejp ( 2018-03-20 15:05:53 -0500 )edit

I believe the navsat_transform_node can handle magnetometer measurements: http://docs.ros.org/lunar/api/robot_l...

ahendrix ( 2018-03-21 00:15:47 -0500 )edit

Thank you for the quick respone! I think you are talking about the use_odometry_yaw parameter of navsat_transform_node, right? Maybe that's even easier.

Robbe_C ( 2018-03-21 06:06:22 -0500 )edit

I don't think the navsat_transform_node is what you need. Navsat_transform is used to transform GPS measurements into odometry which you can fuse in robot_localization.

stevejp ( 2018-03-21 06:31:46 -0500 )edit

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