Description
The motion reference unit (MRU) measures the roll and pitch movements of the vessel. Some sensor models also measure heave.
You must insert the physical location of the motion reference unit related to the reference point (origin) you created on
the Ship page. The values for rotation around the X, Y and Z axis are used to compensate for any misalignments made during the physical installation
of the motion reference unit. Such misalignments occur if the sensor is not placed in parallel with the vessel’s horizontal and/or vertical planes. The required accuracy of the offset and rotation angles depends on the accuracy requirements for the echo data.
|
A |
Rotation around the x-axis: In the positive horizontal direction (forward), a positive rotation is clockwise. |
|
B |
Rotation around the y-axis: In the positive horizontal direction (starboard), a positive rotation is clockwise. |
|
C |
Rotation around the z-axis: In the positive vertical direction (down), a positive rotation is clockwise. |
|
D |
Reference point (Ship Origin) |
Details
X Offset
Select the offset value on the X axis (fore-and-aft direction) from the Ship Origin. Adjust with a positive value for X if the sensor is located ahead of the ship origin.
Y Offset
Select the offset value on the Y axis (athwartship) from the Ship Origin. Adjust with a positive value for Y if the sensor is located on the starboard side of the ship origin.
Z Offset
Select the offset value on the Z axis (vertical) from the Ship Origin. Adjust with a positive value for Z if the sensor is located under the ship origin.
Rotation Around X
Specify an angle (in degrees) to compensate for any deviation from the X axis (fore-and-aft direction) in the vessel coordinate
system.
Rotation Around Y
Specify an angle (in degrees) to compensate for any deviation from the Y axis (athwartship direction) in the vessel coordinate
system.
Rotation Around Z
Specify an angle (in degrees) to compensate for any deviation from the Z axis (vertical direction) in the vessel coordinate
system.