What sensor technologies are used in ROVs?
Remotely Operated Vehicles (ROVs) rely on a suite of sophisticated sensors to navigate complex subsea environments, perform intricate tasks, and gather data. Key sensor technologies typically include imaging sonar for obstacle avoidance and mapping, cameras for visual inspection, Doppler Velocity Logs (DVLs) for measuring speed over the seabed, depth sensors, altimeters, and crucially, high-performance motion sensors.
Motion Reference Units (MRUs) are fundamental components within an ROV's sensor package. They provide precise measurements of the vehicle's orientation and motion across all six degrees of freedom (6DoF): Roll, Pitch, Heave, Yaw, Surge, and Sway. This high-fidelity motion data is essential for vehicle stability, accurate navigation when integrated with systems like DVLs or acoustic positioning (USBL/LBL), and precise control of manipulators and tooling.
Norwegian Subsea specializes in developing advanced MRUs utilizing state-of-the-art MEMS sensor technology and robust sensor fusion algorithms, delivering the high accuracy and reliability required for demanding ROV operations. Our MRU Subsea is specifically designed for these applications, featuring a compact, 6000-meter depth-rated titanium housing, a standard Subconn connector for easy integration, and flexible Ethernet and serial communication options supporting various industry protocols. For applications primarily requiring orientation data, cost-effective Inclinometer/VRU versions are also available, offering the same high Roll and Pitch accuracy.
Related products
Usage area
6000 m depth
Connectors
SubConn 8
Roll & Pitch accuracy
- 3000±0.05°
- 6000±0.02°
- 9000±0.01°
Heave accuracy
5 cm or 5.0%
Further reading
Advanced motion compensation for sonars introduced at Ocean Business 2025
MRUs for vessel performance optimisation in focus at Europort 2025
Research Project to Test Value of MRU Data for Vessel Performance and Carbon Reduction
Related questions
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To improve subsea sensor accuracy, use high-performance MRUs with advanced algorithms and durable housings. Norwegian Subsea MRUs offer 6DoF precision, long-term stability, and easy integration for demanding underwater environments.
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ROV motion sensors differ by accuracy, depth rating, and integration ease. Norwegian Subsea’s MRU Subsea offers 6DoF precision, 6000m depth rating, compact design, and proven reliability for underwater navigation and control.
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MRUs use advanced filtering algorithms like Kalman filters to remove noise and stabilise motion data. This ensures accurate 6DoF output for critical systems such as DP, AHC, sonar, and gangway control.
Related applications
BOP Monitoring
Accurate motion sensors play a crucial role in the structural monitoring of Blowout Preventers (BOPs), enabling the measurement of inclination and lateral displacements.
Riser Monitoring
The NORSUB Subsea MRU is specifically designed to provide highly accurate measurements of roll, pitch (inclination), and lateral motions in risers.
Subsea Surveys
Subsea surveys often demand precise tilt measurements (roll and pitch) for various purposes, such as installation tasks or continuous monitoring of tilt changes and deflections in subsea structures.
ROV/AUV
Reliable motion sensors are vital components in the navigation system and motion compensation of payload sensors for ROVs and AUVs.
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