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New Time-Saving Option and New Output Strings
for Octopus F180series of Precision Attitude & Positioning
Systems
We are pleased to announce an innovative
new option which will significantly reduce the time taken
to install a motion sensor on survey vessels of all sizes.
We have designed a pre-calibrated weather-proof mounting
to house the Octopus F180 inertial sensors and it
also accommodates the twin Novatel antennas, enabling the
system to be calibrated prior to being installed.
Currently available as an integrated element
of the Coda Underwater Inspection System (UIS), the
new mounting will be available as an optional accessory
for all F180 one-box models later this year.
Conventional installation of any inertial
attitude and positioning system on a vessel involves measuring
offsetsbetween the primary antenna and the inertial
sensors and also measuring between the antennas. The measurementsare
entered into the system and accuracy is refined as the vessel
then performs manoeuvres, such as figures-of-eight and circles,
at varying speeds. Depending on the size of the vessel,
its ability to manoeuvre and other limitations such as cost
and weather, calibration can take several hours in some
cases.
With the new Octopus pre-calibrated mounting
option, the offset measurements are already set and the
need for calibration is removed, so speeding up installation.
Once the mounting (containing the inertial sensors) is bolted
into place on the vessel, the Octopus F180 system can be
up and running in 15 minutes. The time-saving benefits of
this new option have already been acknowledged by the US
Coast Guard, currently utilising Octopus F190s on pre-calibrated
mountings as part of their Coda Underwater Inspection Systems
for port and harbour security.
The installation advantage was also evident
in the case of BP's Schiehallion FPSO, when calibration
of their Octopus F180+ simply would not have been possible
using the conventional process. With the FPSO connected
to sea-bed well heads, manoeuvring in figures of eight is
obviously impossible and so the custom made mounting for
the system eliminated this stage altogether. Within 15 minutes
the critical position of the turret was being accurately
measured by the F180+.

In other F180series news, three output strings have
been implemented and are now available with all new Octopus
F180series systems. Members of CodaOctopus team receive
these additional strings for their existing F180 systems
as part of their annual membership.
- Tighter integration between the Octopus F180series
and the Reson range of multibeam sensors can now be achieved
with the Reson UTC string.
- The implementation of the new Trimble PTNL GGK string
enables the provision of time, position and height above
ellipsoid. The precision of the 'height above ellipsoid'
field is such that, if used with an RTK (1cm) correction,
then real time tidal corrections can be performed.
- The new NMEA Rate of Turn string provides the rate of
turn in units of degrees per minute. The output is passed
through a new 2.5 Hz (Bessel) filter, which has been designed
to produce an order of magnitude improvement in signal
to noise whilst minimising phase delay.
Click here
for more information about the Octopus F180series
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