Inserting The Installation Parameters; Correct Installation Parameters Are Crucial For Sonar Operation - Kongsberg Simrad SN90 Reference Manual

Simrad SN90 Reference Manual

Inserting the installation parameters

Topics
Correct installation parameters are crucial for sonar operation, page 214
Inserting the ship origin and dimensions, page 215
Inserting the installation parameters for the transducer, page 218
Inserting the installation parameters for the motion reference unit (MRU), page 222
Adjusting the built-in motion sensor offset, page 225
Adjusting the stabilization offsets for the external motion sensor, page 227
Correct installation parameters are crucial for sonar
operation
The quality and accuracy of the SN90 presentations depend on the hull unit being
correctly installed, and that all necessary parameters related to this installation have
been entered into the software
Ship origin / Ship dimensions
When you have several different sensors and transducers on your vessel, and
you wish each of them to provide accurate data, you need to know their relative
physical positions. To do this, you must establish one or more common reference
points. This reference point is also used to position the sonar echoes relative to the
ship symbol on the display presentation.
Use the page to define a specific reference point (Ship Origin or origo) for the
Ship
various sensors connected to the SN90 system. Do this as accurately as possible.
This information is used to create a new origin in the vessel coordinate system.
Transducer
When the installation trunk is mounted, it may not be positioned with the mounting
holes perfectly aligned to the centre line of the vessel. When the hull unit is placed
on the trunk, the "forward" mark on the transducer shaft sleeve - and thus also
"forward" on the transducer - may not point forward at all, but several degrees off
the centre line. To obtain accurate echo presentations, this misalignment must be
adjusted by changing the installation parameters.
Note
Providing the correct value for this rotation is crucial for the sonar performance.
An inaccurate or incorrect value will cause the sonar echoes to be presented at
the wrong bearing.
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