RangeGuard® Monopole

The first targetless DP Sensor for station-keeping at a wind turbine

The RangeGuard Monopole system is a new type of position reference sensor that does not require a dedicated target – rather it uses the local environment as its target; typically the leg or tower of a wind turbine. This removes the need for physical targets to be installed which makes the vessel completely independent and can increase both safety and decrease turnaround times.

The system consists of a minimum of two RangeGuard microwave marine range finding sensors on the side of the vessel, pointing in the direction of the transition piece at the bottom of the wind tower. Simple geometry determines the range and relative position of the vessel to the transition piece which acts as the target that the system will report the range and bearing from.

  • Vessel independent of installation (no dedicated targets required)
  • No maintenance, reduce costs
  • Detects objects within 300m
  • No moving parts
  • Additional form of redundancy
  • Reduce turnaround times

  • Measures range to the nearest object

    • Sends out a radar signal and detects the radar reflections from the environment
    • An accurate range and bearing measurement is displayed on the Dashboard user interface

      All weather radar technology

      • Fixed beam radar sensors operating in the license exempt short range device band of 24GHz

      The RangeGuard Monopole system is suitable for applications that approach wind turbines such as: 

      • Service operation vessels
      • Crew transfer vessels
      • Walk-to-work vessels
      • Construction vessels

      A Targetless Future

      Guidance Marine is the first company to offer a local DP Position Reference Sensor (PRS) solution that removes the requirement for targets altogether. The system consists of a minimum of 2 RangeGuard Monopole sensors connected to a control unit which in turn is connected to the bridge and the DP system of the vessel. The small lightweight radar sensors are mounted onto the side of the vessel pointing in the direction of the transition piece and simple geometry determines the range and relative position of the vessel.

      Windea La Cour

      Bernhard Schulte have installed a full DP enabled system on their SOV Windea a Cour. Sensors were installed on the vessel at the yard on the starboard side - the same side as the motion compensated gangway.

      The RangeGuard Monopole Dashboard has been logically structured and carefully designed to provide a clear intuitive interface that maximises the opportunities of touch screen technology. The innovative user interface enables Operators to use the RangeGuard Monopole system safely and effectively whilst providing optimum positioning performance.

      • User centred ergonomically friendly design for ease of use 
      • Optional touch screen control
      • Minimalist design to reduce operational ambiguity
      • Simple, clear and concise numeric range and bearing data
      • Sensor control, alarm handling and data logging functionality
      • Control, clarity and complete visibility of the sensor and target(s) operational environment
      • Comprehensive user friendly operator's and installer's guides
      • Operation friendly day and night mode


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