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Multibeam and LiDAR Survey With NORBIT WINGHEAD® and Maritime Robotics Otter USV

Introduction

In this case study we highlight the benefits of using the NORBIT WINGHEAD® and iLiDAR integrated survey system on unmanned surface vehicles for shallow water surveys.

Sensors used:

  • NORBIT WINGHEAD® i77h, featuring integrated Applanix OceanMaster GNSS/INS system
  • NORBIT iLiDAR
  • NORBIT Sound Velocity Profiler
  • Maritime Robotics Otter USV

NORBIT WINGHEAD® and iLiDAR

WINGHEAD benefits:

  • First cylindrical ultra-high resolution bathymetry sonar on the market
  • 0.5 x 0.9beam widths at 400kHz
  • HD beamformer providing 1024 beams per ping
  • High performance integrated GNSS/INS systems
  • Integrated sound velocity probe
  • Small form factor and low power consumption
  • Designed for rapid mobilization on any platform
  • Available with optional LiDAR

Maritime Robotics Otter USV

  • The Otter is a versatile USV designed for seabed mapping and monitoring applications in sheltered waters, harbors, lakes and rivers.
  • Best-in-class endurance for its size, operating up to 20 hours at 2 knots.
  • Max speed of 6 knots.
  • Payload capacity of up to 40 kg.
  • Modular solution easily split up in lightweight parts for easy transportation (smaller vans, boats, helicopters etc.), launch and recovery from cranes on ships or quayside.
  • Built-in AutoCast winch for SVP casts and planning functionality for automated deployment.

Installation

The highly integrated solution enables small form-factor and rapid deployment:

  • All sensors are interfaced to a small topside unit, where data is time stamped by the integrated GNSS.
  • The sonar and surface SVP are interfaced to the topside unit via a single deck cable.
  • The GUI features an integrated INS setup wizard, as well as monitoring functions, to simplify the setup.
  • The survey system interfaces to an on-board computer via Ethernet connection for data acquisition.

Survey Location

  • Skansen is a historic area in the city of Trondheim, Norway
    • A fortification in older days, it is now well known for its marina, train station and the Skansen Bridge, a 52m span bascule railway bridge which can open for marine traffic to access the Trondheim Fjord.
    • The Skansen Bridge was designed by structural engineer Joseph Strauss, who also designed the Golden Gate Bridge in San Francisco.
  • The main goal of the survey was to perform the inspection of the jetty and investigate if there has been any displacement of rocks forming the jetty.
  • The survey was controlled remotely from the Skansen Bridge.

Deployment

The entire system is designed for rapid mobilization and deployment:

  • The USV is lightweight and can be transported in a van
  • Easily deployed from a slipway, with all sensors pre-mounted on the USV
  • Survey offsets are fixed and known, thus no measurements are required

Data Acquisition

The entire system is controlled remotely from the quay side

  • The Otter USV is manoeuvred using a mobile device
  • Easy-to-use control software is used to plan the survey and collect data
  • All data is time synchronized internally
  • RTK GNSS positioning using Internet-based corrections (no cables, base stations or radios)

Benefits of the Combined WINGHEAD, iLiDAR & Otter solution

Combining NORBIT WINGHEAD and LiDAR with the Otter USV enables a surveyor to get highresolution data while drastically minimizing the mobilization time.

  • The combination of NORBIT multibeam and LiDAR technology enables surveyors to collect point cloud data above and below waterline from a portable, unmanned platform. Benefits of the Combined WINGHEAD, iLiDAR & Otter solution
  • NORBIT’s curved array technology allows the beams to be steered electronically up to waterline without having to physically rotate the sonar, which is ideal for combined multibeam and LiDAR surveys and allows seamless transition between the two data types.
  • Curved arrays produce narrower beams (higher resolution) across the entire swath compared to an equivalent flat array system.
  • The combination of 1024 beams and 0.5beam widths provides ultra-high resolution point cloud data and facilitates the detection of small targets such as rocks, ropes, chains, anchors, etc. which may be hazardous to navigation in shallow harbors.
  • The USV can operate in shallow, difficult-to-reach areas where it is difficult for conventional survey vessels to navigate.