Railway Motion Control Unit (RMCU)

Inertial Labs Railway Motion Control Unit (RMCU)

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The Railway Motion Control Unit (RMCU) from Inertial Labs is a high-performance strapdown system that was developed for Railway applications in order to determine absolute orientation (Heading, Pitch and Roll) and parameters of motion (Angular Rates and Linear Accelerations) for any Railway Platforms on which it is mounted. Orientation is determined with high accuracy for both motionless and dynamic applications.



The Inertial Labs RMCU utilizes 3-axis each of precision MEMS accelerometers, miniature Fluxgate magnetometers and MEMS gyroscopes to provide accurate Heading, Pitch and Roll of the device under measure. Integration of the gyroscopes’ output provides high frequency, real-time measurement of the device rotation throughout all three rotational axis. The accelerometers and Fluxgate magnetometer perform very accurate measurements in both static and dynamic conditions. They provide Pitch, Roll and Heading/Azimuth at RMCU initial alignment as well as ongoing corrections to gyroscopes during operation.

Development kits are available for the RMCU.


  • EN 45545, EN 50155 and EN 50011 Railway standards compliant solution
  • One model with multiple configurations at an exceptional price performance ratio
  • State-of-the-art algorithms for different Railway Platforms
  • Highly accuracy miniature Fluxgate magnetometer
  • Gyro-Stabilized Slaved Magnetic Heading
  • Suitable for Trains Motion Control and Primary Attitude Reference
  • Advanced Kalman Filter based sensor fusion algorithms
  • Embedded 2D and 3D magnetic calibration on hard and soft iron
  • All solid-state components (no moving parts)
  • Full temperature calibration of all sensing elements
  • Environmentally sealed (IP67)
  • Compact design

Technical Specifications

Range:0 to 360 deg
Angular Resolution:0.01 deg
Static Accuracy in Temperature Range:0.3 deg
Dynamic Accuracy:0.6 deg RMS
Pitch and Roll
Range Pitch, Roll:±90, ±180 deg
Angular Resolution:0.01 deg
Static Accuracy in Temperature Range:0.05 deg
Dynamic Accuracy:0.08 deg RMS
Measurement Range:±450; ±950 deg/sec
Bandwidth:260 Hz
Bias In-run Stability (RMS, Allan Variance):<4 deg/hr
Bias Residual Error in Temperature Range, RMS:180 deg/hr
SF Accuracy:0.3 %
Noise. Angular Random Walk (ARW):0.12 deg/√hr
Non-linearity:0.01 %
Axis Misalignment:0.15 mrad
Measurement Range:±8, ±15, ±40 g
Bandwidth:260 Hz
Bias In-run Stability (RMS, Allan Variance):0.005, 0.02, 0.03 mg
Bias Residual Error in Temperature Range, RMS:0.5, 0.7, 1.2 mg
SF Accuracy:150, 300, 500 ppm
Noise. Velocity Random Walk (VRW):0.015, 0.035, 0.05 m/sec/√hr
Non-linearity:0.015 %
Axis Misalignment:0.15 mrad
Measurement Range:±8.0 Gauss
Bias In-run Stability, RMS:8 μGauss
Noise Density, PSD:15 μGauss /√Hz
SF Accuracy:0.05 %
Size:129 mm × 53 mm × 49 mm
Weight:120 grams
Update Rate:1 – 4000 Hz (user settable)
Supply Voltage:3.3 to 7 VDC
Power Consumption:0.5 W
Output Interface:RS-485
Output Data Format:Binary, NMEA ASCII
Operating Temperature:-40 °C to +75 °C
Storage Temperature:-50 °C to +85 °C
Operational Vibration:7g, 20 – 2000 Hz
Operational Shock:40g, 10 ms
MTBF:100,000 hours


The Railway Motion Control Unit (RMCU) from Inertial Labs is available through Canal Geomatics. If you would like more information about this product, please feel free to get in touch with us by completing the Request Pricing form.

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