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　　MRU-H Other names:

　　Motion sensor MRU-H

　　MRU-H motion reference unit

　　Motion sensor controller MRU-H

　　KONGSBERG's MRU-H motion reference unit is a high-performance, high-reliability inertial measurement device designed for complex environments such as marine engineering, underwater operations, and ship dynamic monitoring. It has core advantages such as high-precision attitude measurement, multi-axis motion compensation, and adaptability to harsh environments.

　　Product Overview

　　MRU-H is a motion reference unit launched by KONGSBERG, which is mainly used to measure and compensate the motion of carriers (such as ships, underwater robots, drilling platforms, etc.) in six degrees of freedom (roll, pitch, yaw, heave, sway, and surge). Its core function is to provide accurate attitude and motion data for dynamic positioning systems (DP), underwater positioning systems, marine measurement equipment, etc., to ensure the stability and operation accuracy of equipment under complex sea conditions.

　　Core functions and technical features: Multi-axis motion measurement capability: MRU-H can output six-degree-of-freedom (6-DOF) motion data in real time, including roll, pitch, yaw, heave, acceleration and angular rate, to meet the precise measurement needs in complex dynamic environments.

　　High-precision attitude measurement: Using high-precision gyroscopes and accelerometers, combined with advanced sensor fusion algorithms (such as Kalman filtering), to achieve sub-degree attitude measurement accuracy, support real-time output of roll, pitch, and yaw angle data, and meet high-precision requirements such as dynamic positioning and underwater robot navigation.

　　High-precision three-axis measurement

　　Angular velocity accuracy: ±0.05°/s (RMS), suitable for attitude stability requirements in high dynamic environments.

　　Acceleration accuracy: 0.01 m/s² (RMS), can capture small motion changes.

　　Roll/pitch angle accuracy: 0.05° (real-time), meeting the requirements of precise positioning and attitude compensation.

　　Core functions and technological innovations

　　High-precision attitude solution algorithm: Using Kalman filtering and multi-sensor data fusion technology, integrating three-axis gyroscopes, accelerometers, magnetometers and GNSS data, eliminating single sensor errors, and improving stability in dynamic environments.

　　Dynamic compensation and filtering: Built-in adaptive filter can suppress high-frequency noise such as ship vibration and wave interference, ensure smooth and stable output data, and is suitable for precision operations (such as submarine pipeline laying).

　　Redundant design and reliability: Supports dual power input and dual communication link redundancy, key components use military-grade components, and MTBF (mean time between failures) exceeds 50,000 hours, ensuring long-term continuous operation.

　　Multi-axis motion compensation: For the heave, sway, and sway of underwater operating equipment (such as ROV, AUV), MRU-H provides real-time motion compensation to improve operation accuracy and stability. In scenarios such as marine mapping and underwater pipeline laying, it can effectively reduce the impact of carrier motion on measurement results.

　　Adaptability to harsh environments: The equipment adopts a fully sealed and pressure-resistant design, supports long-term stable operation in deep-water environments (such as 4,000 meters deep), has shock and vibration resistance, and is suitable for extreme marine environments such as high sea conditions and strong currents.

　　Multi-environment adaptability: Depth compatibility: supports installation at water depths from 10 meters to 4000 meters, suitable for underwater robots (ROV/AUV), submarine pipeline laying and other scenarios.

　　Dynamic response: low real-time output data latency, adapting to high-frequency dynamic requirements such as high-speed ship motion control and offshore crane heave compensation.

　　Modular design

　　Expansion interface: can integrate mounting brackets, junction boxes, cables and submarine housings, supporting rapid deployment and maintenance.

　　Anti-interference ability: built-in temperature compensation and filtering algorithms to reduce measurement noise in complex environments.

　　Data interface and compatibility: provides a variety of communication interfaces (such as RS-422, RS-232, Ethernet), supports seamless integration with mainstream dynamic positioning systems (such as Kongsberg K-Pos) and underwater positioning systems (such as HiPAP), and flexible data output formats to adapt to the system requirements of different users.

　　Typical application scenarios

　　Marine engineering and ship dynamic positioning (DP)

　　Offshore crane heave compensation: During lifting operations, MRU-H drives the hydraulic system to achieve millimeter-level precision compensation by real-time monitoring of the ship's heave movement to avoid cargo shaking or damage.

　　DP system attitude feedback: Provides real-time roll/pitch data for dynamically positioned ships, optimizes thruster control strategies, and reduces fuel consumption.

　　Underwater robot (ROV/AUV) navigation

　　Complex terrain mapping: In submarine pipeline inspections or shipwreck detection tasks, MRU-H can accurately compensate for ROV attitude deviations and ensure the spatial accuracy of multi-beam sonar data.

　　Long baseline (LBL) positioning assistance: Combined with the ultra-short baseline (USBL) system, the acoustic positioning error is corrected through attitude data to improve underwater positioning accuracy to the centimeter level.

　　Industrial automation and testing

　　Bridge vibration monitoring: In the health monitoring of cross-sea bridges, MRU-H can be deployed on bridge towers or cable nodes for a long time to analyze the structural response under typhoons or earthquakes.

　　Wind power platform stability assessment: By monitoring the six-degree-of-freedom motion of the floating wind turbine platform, the mooring system design is optimized to reduce the risk of fatigue damage.

　　Ocean surveying and scientific exploration

　　With multi-beam depth sounders, side-scan sonars and other equipment, the impact of ship movement on measurement data is eliminated, and the accuracy of seabed topography mapping is improved.

　　Case: After a polar research vessel was equipped with MRU-H, a water depth measurement error of ±5 cm was achieved in the floating ice area.

　　Market advantages

　　Brand and technology accumulation: As a leader in the field of marine technology, KONGSBERG has more than 50 years of technology accumulation in inertial navigation, dynamic positioning and other fields. MRU-H inherits its high reliability and high precision technology genes.

　　Global application cases: MRU-H has been widely used in major marine engineering projects around the world, such as deep-sea drilling platforms, cross-sea bridge construction, submarine pipeline laying, etc., and its stability and accuracy have been recognized by the industry.

　　Customized service: KONGSBERG can provide customized solutions according to user needs, such as special environment adaptability improvement, data interface customization, etc., to meet the personalized needs of different scenarios.

　　Eco-compatibility and scalability: It can be seamlessly integrated into Kongsberg's K-POS DP system, Seapath navigation system, etc. to form a complete marine automation solution and improve overall operation efficiency.

　　Typical user cases

　　Equinor (Norwegian National Petroleum Corporation): Deploy MRU-H in the floating production storage and offloading unit (FPSO) of the North Sea oil field, increasing the efficiency of hoisting operations by 40% and reducing the accident rate by 65%.

　　Ocean University of China: Integrate MRU-H on the "Dongfanghong 3" research vessel and successfully complete the three-dimensional flow field observation of the mesoscale vortex in the western Pacific.

　　User pain point solution

　　Anti-electromagnetic interference capability: In the strong electromagnetic environment of offshore wind farms, MRU-H ensures that data is not lost through shielding layer design and digital filtering algorithm.

　　Long-term stability: An offshore drilling platform has been running continuously for 3 years without calibration drift, and the maintenance cost has been reduced by 70%.

　　Summary

　　KONGSBERG MRU-H motion reference unit has become the preferred solution in the fields of marine engineering, underwater robots and industrial automation due to its high precision, high reliability, strong environmental adaptability and cost-effectiveness. Whether it is the dynamic positioning of deep-water drilling platforms or the precise mapping of complex seabed terrain, MRU-H can provide stable and accurate motion data support, helping users to achieve a double improvement in operating efficiency and safety.

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