Hardware
Copyright © 2015 Coda Octopus Products Ltd
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F180R MOTION Sensor User and Reference Guide
Measure and write down the rotation angles required to bring the F180R System into
alignment as detailed above. Later, you must input these values in the MOTION Settings
Wizard.
3.4.2 Antenna Offset
It is necessary to configure the F180R System with Antenna Offset parameters that describe
the position of the primary GNSS antenna relative to the F180R System IMU. To provide this
important information you must measure the antenna offset distances.
The antenna offset distances are the differences in the fore–aft, port–starboard and vertical
installation positions of the F180R System IMU and the primary GNSS antenna. You must
measure each of the antenna offset distances from the F180R System IMU to the primary
antenna and ensure that they are measured to within the maximum specified accuracies.
GPS Offset Measurement Accuracy
NOTE: You should measure the antenna offset distances in the vessel frame of
reference. MOTION Control sets the Stand Alone accuracy to a maximum of 0.5
metres. As the Differential/RTK positional accuracies are of a higher magnitude,
baseline measurements for these systems can be made to 2.0 metres.
NOTE: You should never over–estimate how accurately you have measured the offset
distances. When estimating the accuracy of your measurements you should also allow
for any misalignment of the unit with the vessel's (X, Y, Z) axes, which will also affect
the overall measurement accuracy of the F180R System. For example, if an offset is
10m and you have not allowed for a 1° heading alignment then the Y offset
measurements will include 0.17m error arising from this 1° error.
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