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Motion Reference Units (MRU)


MRU-B (Basic)MRU-E (Enhanced)MRU-P (Professional)MRU-PD (Survey set)
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Heave accuracy5% / 5cm5% / 5cm5% / 5cm5% / 5cm
Pitch & Roll dynamic accuracy0.05 deg0.05 deg0.05 deg0.03 deg
Pitch & Roll post processing accuracy0.03 deg0.03 deg0.03 deg0.02 deg
Linear acceleration accuracy0.005 m/sec20.005 m/sec20.005 m/sec20.005 m/sec2
Heading dynamic accuracy-0.6 deg0.4 deg0.05 deg (4 meters base line)
Heading post processing accuracy-0.1 deg0.1 deg0.03 deg
Velocity accuracy--0.03 m/sec0.03 m/sec
Position accuracy--1.5 m (GPS L1)
1.2 m (GPS L1&L2)
0.6 m (SBAS)
0.4 m (DGPS)
0.05 m (PP)
0.01 m + 1 ppm (RTK)
0.4 m (DGPS)
0.01 m + 1 ppm (RTK)
Gyroscopes Bias in-run stability1 deg/hr1 deg/hr1 deg/hr1 deg/hr
Accelerometers Bias in-run stability0.005 mg0.005 mg0.005 mg0.005 mg
InterfaceRS-232, RS-422, RS-485, Ethernet
Output data formatBinary, TSS-1, NMEA 0183 ASCII characters

Motion Reference Units key performance

Heave accuracy @ 10 seconds wave

Heave accuracy @ 20 seconds wave

Pitch dynamic accuracy @ 20 sec wave

Roll dynamic accuracy @ 20 sec wave

MRU Heave, Pitch & Roll dynamic testing

Gyroscopes & Accelerometers Bias in-run stability

The Inertial Labs has developed Motion Reference Units (MRU) to meet requirements from marine and hydrographic applications. MRU is enhanced, high-performance strapdown Motion Sensor, that determines Pitch & Roll, Heave, Sway, Surge, Ac celerations, Angular rates, Heading, Velocity and Positions for any device on which it is mounted. The Inertial Labs Motion Reference Units utilizes solid state 3-axes each of precision accelerometers, magnetometers, gyroscopes and barometric sensors to provide accurate Heave, Sway, Surge, Pitch and Roll of the device under measure.

Integration of very low noise gyroscopes output provides high frequency, real-time measurement of the Vessel, Ships, Helidecs, ROV, Marine antennas, Cranes rotation about all three rotational axes.

Through a combination of proven sector expertise and a continued investment in technological innovation, Inertial Labs delivers the optimum balance of price and performance ratio solutions for its customers.

Our MRUs featuring developed few micro g Bias in-run stability Micro Electro Mechanical System (MEMS)-based accelerometers. New generation of Inertial Labs 1 deg/hr Bias in-run stability MEMS-based gyroscopes are an ideal solution for demanding marine applications, with their electronic nature negating the problems associated with expensive mechanical gyro solutions, as well as those based on fiber optic (FOG) technology.

Inertial Labs MEMS gyroscopes set the standard for the industry, with our high-end MRUs featuring gyros that enable sector-leading accuracy and reliability standards.

Applications and customer cases:

  • State-of-the-art algorithms for Vessels, Ships, Active Heave Compensators, Cranes, Helideck, ROV, AUV, DPS, Buoys, Echo Sounders, Offshore Platforms
  • 0.08 deg RMS Pitch & Roll dynamic accuracy
  • 5% or 5 cm RMS (whichever is greater) Heave accuracy
  • 0.005 m/sec2 linear acceleration accuracy
  • NMEA 0183, TSS1 output data formats
  • HYPACK software compatibility
  • Velocity and Horizontal positions output
  • Environmentally sealed (IP67), compact design