The design of the Fanbeam 5 laser unit, our custom reflectors and the Fanbeam Controller 4.0 control software make Fanbeam the laserbased PRS of choice. Our range of data outputs, and the ease with which Fanbeam can be combined with other sensors and DP systems, make it ideal for holding a vessel in station, or for moving a vessel with great precision.

2 KEY PRINCIPLES
Fanbeam 5 is engineered to support DPOs based on:

Control

DPOs should be supported by clear, intelligent, quick-to-operate, pre-configurable software, which offers the peace of mind of automation, alerts and performance indicators.

Responsiveness

Since conditions at sea are unpredictable, and no two operations are the same, DPOs must have the ability to quickly and simply control laser tilt, target acquisition, filters and all other aspects of sensor control.

BETTER TARGET IDENTIFICATION
The Fanbeam 5 unit is mounted over the working end of a vessel. The sensor emits invisible laser pulses, which bounce off custom reflectors mounted on rigs or other installations. These pulses are received back into the Fanbeam sensor. Personnel on deck and reflective surfaces are no problem for Fanbeam 5, as the Fanbeam Controller 4.0 software identifies and rejects false observations. Operators can pre-program range cut-offs for observations, so that anything out of range is filtered. Reflectors provide accuracy in a variety of conditions: tube reflectors offer low-cost 360° coverage for short-range operations, while prism clusters provide reliable positioning at longer ranges, up to 2000 m. Auto-level filtering means settings adjust automatically, to allow for changing conditions. Operators can tilt the laser during operations, allowing for fine tuning at any time.

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The Light Weight Taut Wire is a position reference system designed for use in deck-mounted port or starboard position on surface vessels. Its purpose is to provide accurate data of a surface vessel’s movements with respect to the position of a depressor weight on the sea floor.

A wire is maintained at a constant tension by means of a depressor weight on the sea-bed and a pneumatic and electric servo-assisted “mooring” system. Any movement of the vessel will cause the tensioned wire to deviate from its initial inclination. This movement activates potentiometers mounted in the gimbal (sensor) head and produces changes of analogue signals directly proportional to the deviation in inclination.

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Multiple sensor heads
RADius can be deployed as an omni directional system utilising four sensor heads. These can be placed on suitable locations on the vessel, depending on the construction and operation. This provides full 360˚ signal acquisition as well as avoidance of blind angles, as there will be a sensor head at a receiving angle to transponders at all times, regardless of the vessel’s relative position to the RADius transponder. Signal processing will effectively remove possible interference with other transmitting devices in the same frequency band. Accurate Doppler measurements allow for rapid and reliable determination of relative velocities between the maneuvering vessel and transponders.

Operational features
RADius is capable of detecting and measuring accurate range and bearing to any transponder within the range of up to 550 metres, depending on the targets transponders. The direction from the interrogator to each transponder is accurately determined by the use of interferometric methods.

Ease-of-use HMI RADius features a highly intuitive touch-ready HMI developed in close co-operation with experienced DP operators. This HMI enables the operators to assess the quality of their positioning quickly and effectively during operation. For better visibility under different light conditions, the operator can easily select between a set of colour palettes, including a well proven night display.

Autodetecting transponders
Search and identification of transponders is easily done with the autosearch utility. Transponders are automatically detected and shown in the operator view. Wide opening angles
RADius has a vertical and horizontal opening angle of 100°. This secures stabile manoeuvring in close-by operations where the difference in height for the mounted transponder and interrogator can be considerable. Hence, it is not necessary to tilt the sensor head in any direction to obtain a signal.

A variety of transponders
Retroreflective transponders are mounted on the target which is to be approached. A variety of transponders are available, suitable for any operation that demands a
robust and reliable relative positioning solution.

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