Hardware
Copyright © 2015 Coda Octopus Products Ltd
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F180R MOTION Sensor User and Reference Guide
3.3.2 Antenna Installation
There are several important points that you must remember when you choose a location for
the GPS antennas. You must mount them:
outside in an elevated position on the vessel where they have a clear view of the sky in
all directions
rigidly with respect to each other and with respect to the IMU
NOTE: Do not mount the antennas on flexible masts, or on mast platforms that tend to
move significantly relative to the vessel.
with a known separation distance between them
in locations that are least likely to experience multipath satellite signals caused by
reflections off nearby structures or flat surfaces
NOTE: Multipath reflections of GPS signals are the dominant source of errors in
theF180R System. Typical reflectors include flat surfaces on the vessel and the surface
of the sea. Locating the antennas as high as possible will reduce the multipath
reflections from the sea surface and vessel superstructure.
in locations where salt deposits are unlikely to accumulate and degrade the received
signal quality
in locations isolated from high levels of vibration, shock or electrical noise
more than 5 metres from radar, UHF, satellite communications or other communications
antennas
NOTE: You should consult the documentation for any microwave emitters or radar
antennas mounted on the vessel close to your proposed F180R System antenna
mounting location. The F180R System antennas are sensitive to any electromagnetic
radiation that might interfere with electrical equipment.
where they are not exposed to extremes of temperature beyond the acceptable limits
listed in the environmental specifications
where the antenna cables can run easily in one continuous length from each antenna to
the F180R System Box
To install the antennas you will need:
the supplied antennas
NOTE: For L1 deployment this is the Novatel GPS-701 antenna. For L1/L2 deployment
this is the Novatel GPS-702 antenna. For mixed systems the antennas are marked as
primary and secondary in order to avoid confusion.
antenna cables
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