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Effects of wrong lidar calibration

asked 2016-03-23 13:38:04 -0600

Mehdi. gravatar image

I am working on calibrating the pose of some lidar relative to base_link frame. After Calibrating x,y and yaw angle of the lidar, I noticed that there is inconsistency in the data showed by the sensor. By increasing the decay time of the laser scans and rotating the robot in place (having a good odometry) this is what I see in Rviz:

image description

I also compared what the front and back lidar see and this is what I get: image description

The robot is standing in a nearly rectangular area, what I find weird is that in one corner both laser are well aligned while on the other corner the deviation of the scans is huge.

I am wondering if this effect can be produced by a wrong calibration of x,y,yaw values or that it is the result of a tilted lasers not sharing the same scanning plane (roll and pitch are not equal to zero).

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answered 2016-03-24 10:27:40 -0600

What do you mean with "wrong calibration of x,y,yaw values" ? You performed a 3DoF calibration, but you need a full 6DoF calibration here. What you see is, without doubts, an issue caused by having different scanning planes. Which kind of robot are you using?

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Yes well I assumed that the lasers are mounted horizontally, but I guess some error in the pitch and roll cannot be avoided, leading to different scanning planes. The robot I work on is developed at the company where I work.

Mehdi. gravatar image Mehdi.  ( 2016-03-24 11:16:28 -0600 )edit

I had the same issues in my lab in the university ;-) You can't assume anything in this robotic-world!

Augusto Luis Ballardini gravatar image Augusto Luis Ballardini  ( 2016-03-26 16:27:15 -0600 )edit

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Asked: 2016-03-23 13:38:04 -0600

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Last updated: Mar 23 '16