Kongsberg Seatex Seapath 200, Installation Manual

Page: 44 / 130

Seatex Seapath 200 Installation Manual, rev. 13 Installation
30
3.4.3.4 Setup procedure
The following procedure is used to configure the Processing Unit on-line:
1.
Install the SCC software on an external PC if not already done. See "Appendix D -
Seapath configuration software, SCC" on how to install the software.
2.
Power up the Seapath unit if not already running. Connect a null-modem cable or the
delivered interconnection cable from a free serial port on an external PC to the front panel
connector on the Processing Unit. Start the SCC program and click on the
Connect
button
in the
Seapath
start-up window.
3.
When contact with the Seapath is established, edit the Seapath parameters according to
the completed Installation Worksheet. Finally, select
Parameter Management \
Download
in the folder list in order to download the entered configuration parameters to
the Seapath unit. For more description of each of the configuration parameter selections,
see "Appendix D - Seapath configuration software, SCC".
3.4.4 Calibration
The system has to be calibrated on board the vessel after installation. A typical calibration
consists of:
•
Calibrating the direction of GPS antennas against an external reference. Type of reference
must be decided according to the required accuracy.
•
Calibrate the MRU axes measured by the MRU against an external reference. Decision on
whether MRU calibration is needed and type of reference is based on the type of system
the Seapath is interfaced to and the accuracy required.
3.4.4.1 Calibration of the GPS antenna installation
For the GPS antenna installation the following calibration parameters have to be determined:
•
Baseline Length
. The baseline length between the two antennas is measured in metres.
The length can be selected in the range 0.2 to 6.0 metres, but the recommended antenna
baseline length range is 2.5 to 4.0 meters.
•
Heading Offset
. The direction of the GPS antennas relative to the vessel's longitudinal
axis is measured in degrees.
•
Height Difference
. The height difference between the two antennas is measured in
metres.
It is of crucial importance to calibrate the heading offset correctly. During this calibration,
several accurate reference measurements of the vessel heading must be read/logged
simultaneously with the heading output from the Seapath. The data logging should continue
for at least two hours under calm conditions alongside a quay. The best results are achieved if
continuous logging of both the reference system and the Seapath measurements can be
performed during the calibration period. If simultaneous logging of the two systems is not