KONGSBERG MRU-M-MB3

Product Brief: High-precision solid-state Motion Reference Unit providing real-time six degrees of freedom (roll, pitch, yaw, heave, surge, sway) and linear accelerations. Designed for marine dynamic positioning, crane heave compensation, ROV/AUV navigation aiding, antenna stabilization, and wave monitoring. Uses MEMS inertial sensors with Kalman-filter sensor fusion; optionally aided by external GNSS/DVL for enhanced heave accuracy.

Category: Others

Description

Working Principle: Tri-axis MEMS gyroscopes and accelerometers continuously sample motion; onboard Kalman filter estimates attitude and heave by fusing accelerometer gravity vector (low-frequency) with gyro integration (higher-frequency) and removing bias/drift; optionally accepts GNSS or DVL aiding data to improve heave and velocity accuracy.

Sensor Technology: MEMS gyros + MEMS accelerometers + magnetometer; optional dual-antenna GNSS input for true heading aiding

Attitude Accuracy (Roll / Pitch):

Static (RMS): ≤ 0.05° – 0.08° (typical, depending on model year/firmware)
Dynamic: ≤ 0.10° – 0.15° (1σ, sea state dependent)

Heading (Yaw) Accuracy: With magnetic aiding 1°–2° RMS; with GNSS dual-antenna aiding ≤ 0.1° RMS (model/option dependent)

Heave Accuracy:
Real-time heave: ±5 cm or 5 % of wave height (whichever larger)
Delayed (post-processed / smoothed): ±2 cm or 2 %

Heave / Data Update Rate: Up to 200 Hz (typical 10 / 25 / 50 / 100 Hz selectable)

Angular Rate Range (Gyro): ±300 °/s typical

Accelerometer Range: ±2 g to ±8 g (model dependent)

Supply Voltage: 9 V DC – 36 V DC (typical 12/24 V DC marine supply)

Power Consumption: < 3 W typical

Interfaces / Output Formats:
RS-232 / RS-422 (serial ASCII/NMEA/Kongsberg binary)
Ethernet (TCP/UDP) on some firmware versions
Optional CAN / Synchro output on specific variants

Mounting Orientation: Any orientation (software alignment offsets configurable via “lever arm” and “orientation matrix”)

Enclosure / Protection: Sealed aluminum housing, IP67 (some variants IP68), resistant to salt spray per IEC 60945/ DNV GL type approval

Operating Temperature: –25 °C to +70 °C

Storage Temperature: –40 °C to +85 °C

Weight: ≈ 0.5–1.0 kg (dependent on cabling/housing option)

Certifications: IEC 60945, DNV GL approved for marine use; meets IMO MSC.192(79) performance standards for heading/attitude devices where applicable

Applicable Industries / Applications: DP1–DP3 dynamically positioned vessels, offshore crane heave compensation, seismic survey vessels, ROV/AUV inertial navigation aiding, wind farm installation vessel motion compensation, coastal radar platform stabilization, wave buoys

Installation Requirements: Mount on rigid, vibration-isolated surface with minimal flex; align physical axes to vessel axes and enter lever-arm offsets (X/Y/Z distance from MRU to vessel COG or crane hook point) in configuration software; ensure proper sealing of bulkhead connector; route serial/Ethernet cables away from high-power RF sources.

Usage Notes: Perform initial “leveling” or alignment procedure per Kongsberg manualafter first installation; for best heave accuracy in rough seas consider GNSS aiding input if available; periodic recalibration not normally required but verify alignment after any physical remount; protect connectors from seawater ingress — use supplied O-ring and mating connector with proper potting if exposed.

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