IMU data is not i want

[zhiweiwuLy]

When I used the LiDAR model Airy, I found that some of the IMU data output in ROS1 was missing.
data of "orientation" is always "0" ,and the data of "linear_acceleration.z" is not G or other value

[HaoQChen]

Our IMU only output 6 axis data, without orientation information.

IMU's coordinate is not same as Lidar's

G is 9.80665m/s2