Parameters between Lidar and Imu/GNSS

[ManChrys]

Hello,

i have a livox mid 40 and an INS/GNSS system (xsens mti g 710) . I would like to ask you whats these parameters mean

<rosparam param="Extrinsic_T_livox2gnss"> [0.997573, -0.024254, 0.065274, 0.322019,
                                           0.023477, 0.999644, 0.012663, 0.043158,
                                           -0.066402, -0.011080, 0.997733, 0.456606,
                                           0.0, 0.0, 0.0, 1.0]</rosparam>

I understand that some of them are the distances between lidar and imu but could you explain every number on this table what represents?

Thanks in advance.

[SiyuanHuang95]

Hi,

Thanks for your interest in our project.

The T matrix contains the Rotation matrix and translation vector.

R = T [0:2, 0:2]
t = T[0:2, 3]

so you would figure out that the rotation matrix is almost an identity matrix and translation vector is small.

Best

[InterKnight]

Hi,

Thanks for your interest in our project.

The T matrix contains the Rotation matrix and translation vector.

R = T [0:2, 0:2] t = T[0:2, 3]

so you would figure out that the rotation matrix is almost an identity matrix and translation vector is small.

Best

[0.997573, -0.024254, 0.065274, 0.322019,
0.023477, 0.999644, 0.012663, 0.043158,
-0.066402, -0.011080, 0.997733, 0.456606,
0.0, 0.0, 0.0, 1.0]

that means 0.322019 is x translation， 0.043158 is y translation, 0.456606 is z translation ?

[InterKnight]

Hi，think you for great project.
I have another question about parameters:
why parameters in livox_odometry.launch is not same with that in livox_mapping.launch ?

[SiyuanHuang95]

Hi,
Thanks for your interest in our project.
The T matrix contains the Rotation matrix and translation vector.
R = T [0:2, 0:2] t = T[0:2, 3]
so you would figure out that the rotation matrix is almost an identity matrix and translation vector is small.
Best

[0.997573, -0.024254, 0.065274, 0.322019, 0.023477, 0.999644, 0.012663, 0.043158, -0.066402, -0.011080, 0.997733, 0.456606, 0.0, 0.0, 0.0, 1.0]

that means 0.322019 is x translation， 0.043158 is y translation, 0.456606 is z translation ?

@InterKnight Right

[SiyuanHuang95]

Hi，think you for great project. I have another question about parameters: why parameters in livox_odometry.launch is not same with that in livox_mapping.launch ?

@InterKnight Usually the translation part does not affect the final result much. And the rotation part is almost identical.

[InterKnight]

Hi，think you for great project. I have another question about parameters: why parameters in livox_odometry.launch is not same with that in livox_mapping.launch ?

@InterKnight Usually the translation part does not affect the final result much. And the rotation part is almost identical.

thank you very much!

[SiyuanHuang95]

When no further questions, I will close this issue.