Hardware
Copyright © 2015 Coda Octopus Products Ltd
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F180R MOTION Sensor User and Reference Guide
Fore-Aft offset—the distance between the installed
position of the F180R System IMU and the centre of the
primary GNSS antenna along the fore–aft line of the
F180R System IMU.
Port-Starboard offset—the distance between the
installed position of the F180R System IMU and the
centre of the primary GNSS antenna along the port–
starboard axis of the F180R System IMU.
Above-Below offset—the distance between the
installed position of theF180R System IMU and the
primary GNSS antenna along the vertical axis of the
F180R System IMU.
Please refer to the System Dimensions for the IMU reference point. Measure and write down
the offset distances as detailed above. Also make an estimation of the accuracy with which
you have made these measurements. Later you must type these values into the MOTION
Control Settings Wizard.
3.4.3 Antenna Separation
The antenna mounting arrangement, allows for an antenna separation distance, or baseline
length, of between 1 and 4 metres. This is a single, straight–line measurement between the
centres of both antennas and is easy to measure after you attach the antennas to the
mounting bar and before you install the mounting bar on the vessel.
Optimal system performance during the heading initialisation and calibration phases can be
achieved by using the smallest antenna baseline that delivers measurements meeting your
specification. A longer baseline will give increased heading accuracy, however the time taken
to Heading Initialise and system to calibrate will also take long. Thus optimal heading
initialisation periods and calibration times are achievable with baseline lengths of 2.0m or
less.
It is essential to measure the straight–line distance - the antenna separation - between the
antenna centres as accurately as possible.
WARNING: It is essential that you measure this antenna separation to an accuracy of
better than 5mm.
This measurement will be used as the Antenna Separation input parameter in MOTION
Control. Once you have done this, the system will use measurements delivered by the GNSS
receivers to 'aid' the independent measurements of the IMU.
If you have not already done so, measure and record the antenna separation distance to an
accuracy of better than 5mm. Later you must input this measurement in the MOTION Control
Settings Wizard.
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