why not use imu linear_acceleration to calculate translation for undistortion

[likegogogo]

It looks like now this repo only use rotation info from imu.
why not use imu linear_acceleration to calculate translation for undistortion?

[xuankuzcr]

The LiDAR point cloud undistortion part in the code only compensates for the rotation, but does not calculate the translation. This is because the translation needs the speed state, but the long-time integration speed will be very inaccurate only by IMU, which needs to be corrected by estimating the speed in real time. Currently, this is not done, so only the rotation is used.