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Rotate the coordinates of IMU

asked 2019-01-08 04:41:45 -0500

S.Yildiz gravatar image

Hey, I'm using a imu but the problem is that the coordinate frame is wrong. y/roll is pointing to north, x/pitch is pointing to east and z is down. But I have to rotate it 180° to the positive side by roll. I know I have to do something like this:

  tf::Transform transform;
  transform.setOrigin( tf::Vector3(0.0, 0.0, 0.0) );
  transform.setRotation( tf::createQuaternionFromRPY(0,0,M_PI/2) );
  tf_broadcast->sendTransform(tf::StampedTransform(transform, ros::Time::now(), "/base_link", "imu_frame"));

But instead of using pi/2 I have to use pi? And it has to be (PI,0,0)?

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answered 2019-01-08 05:22:45 -0500

Dyson sphere gravatar image

updated 2019-01-08 05:25:49 -0500

At first I would advise you to check if you mounted the sensor in a "correct way" aka "correct" orientation (check your sensors documentation/manual on this one). Simple mistake of switching top and bottom side can be stressful and could be a cause of your problems. If this part is correct then the "problem" you are facing could be in coordinate system your IMU uses. There are left- and right-handed coordinate system, both of which are know to be used in robotics. Check this link for more information. Hope this helps you understand more about your problem.

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Asked: 2019-01-08 04:41:45 -0500

Seen: 438 times

Last updated: Jan 08 '19