Instruksjoner 02

A compact DVL improving the efficiency and quality of ROV data collection

Download our comprehensive Application Note on how researchers at the Norwegian University of Science and Technology solved challenges related to ROV data collection with a Nortek DVL.
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Challenge

Steep underwater walls, such as those found along submarine canyons (and other underwater features) are often important to investigate for multiple scientific end users. Biologists and geologists, as well as professionals in industrial sectors, have keen interest in learning more about them. However, surveying and mapping of such walls with ROVs has been challenging due to technical limitations. ROV operations today are heavily reliant on experienced pilots. Being able to automate the control would increase both the efficiency and quality of data collection, while freeing up time and resources.

Solution

Obtaining velocity and altitude measurements from a compact, forward-facing 1 MHz Nortek DVL. This helped an ROV automatically follow a pattern on a wall, while keeping a fixed distance from the wall.

End user value

“Getting the velocity and altitude measurements from the forward facing DVL enabled us to run the ROV in an automatic pattern on a vertical rock wall while maintaining a constant distance to the wall. The system was able to maintain a distance error well within acceptable limits, and the image quality was generally high.”

Stein M. Nornes,

Research Fellow, Norwegian University of Science and Technology (NTNU)


Instruments in use


  • DOPPLER VELOCITY LOG

    DVL1000 - 4000 m

    Bottom-track from over 0.2 to 75 m range; 4000 m max. operational depth
  • DOPPLER VELOCITY LOG

    DVL1000 - 300 m

    Bottom-track from over 0.2 to 75 m range; 300 m max. operational depth

Relevant Insights


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