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Simrad Echo sounder system Instruction manual
9
Repeat for each sensor interface that you need to set up.
10 Close the
dialog box.
Installation
Related topics
Preparations, page 12
Calibrating the current velocity measurements, page 28
Functions and dialog boxes, page 35
Inserting the installation parameters for the
global positioning system (GPS) antenna
and the transducer
The physical location of the global positioning system (GPS) antenna relative to the
transducer is required to allow the echo sounder to show the correct navigational
information in the echo sounder presentation. If you do not have a motion reference
unit (MRU) connected to your echo sounder system, you must establish an alternative
origin to be used during the calibration.
Prerequisites
For accurate ship dimensions you need the detailed vessel drawings. Neither tools nor
instruments are required. The echo sounder system is turned on and operates normally.
Context
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.
The antenna of a position sensor is typically mounted high above the superstructure,
while a motion sensor is located close to the vessel's centre of gravity. Both of these
are physically positioned far away from the transducer, which may be located closer to
the bow. Very often, the information from one sensor depends on data from an other.
It is then important that the relevant measurements are compensated for these relative
distances.
The origin is the common reference point where all three axis in the vessel coordinate
system meet. All physical locations of the vessel's sensors (radar and positioning
system antennas, echo sounder and sonar transducers, motion reference units, etc.) are
referenced to the origin. In most cases, the location of the vessel's "official" origin
has been defined by the designer or shipyard. This origin is normally identified with a
physical marking, and also shown on the vessel drawings.
If necessary, other origin locations may be defined for specific products or purposes.
We establish an alternative origin on the water line vertically under the GPS antenna
for this calibration.
20
110-0002398/A
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