54
409977/B
Verifying the installation parameters for the
motion reference unit (MRU)
The physical location of the motion reference unit (MRU) relative to the transducer is
required to allow the SU90 to adjust for roll and pitch as accurately as possible. This task
is only applicable is you are using an external motion reference unit on your SU90.
Prerequisites
For accurate location of the motion reference unit (MRU), you need the detailed vessel
drawings. The information about the installation angles must be retrieved from the
reports provided by the personnel that installed the equipment. Neither tools nor
instruments are required. The SU90 system is turned on and operates normally.
Context
The information from a motion reference unit (MRU) (normally heave, roll and pitch
information) is imported into the SU90 to increase the accuracy of the echo data. The
SU90 is provided with a built-in motion sensor. It is placed inside the Motor Control
Unit. For improved operational accuracy, an external motion reference unit (MRU) may
be used. The motion reference unit (MRU) measures the roll and pitch motions of the
vessel. Some sensor models also measure heave.
On the
MRU
page, you must define the physical location of the motion reference unit
related to the reference point you created on the
Ship
page. The rotation around the X, Y
and Z axis is used to compensate for 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 requirement for the SU90 data.
Procedure
1
Open the
Setup
menu.
2
On the
Setup
menu, select
Installation
.
Observe that the
Installation
dialog box opens. This dialog box contains a number
of pages selected from the menu on the left side.
3
On the left side of the
Installation
dialog box, select the small white triangle next to
Installation Parameters
.
Observe that a menu opens with access to all the individual pages.
4
Select
MRU
to open the page.
a
From the vessel drawings, extract the relevant offset information, and insert
those values.
Simrad SU90 Harbour Acceptance Test
Summary of Contents for SU90
Page 61: ......
Page 62: ...2020 Kongsberg Maritime...
