Railway Motion Control Unit (RMCU)

The Railway Motion Control Unit – RMCU is a high-performance strapdown system developed for Railway applications to determine the absolute orientation (Heading, Pitch, and Roll) and motion parameters (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 three 3-axes, each precision MEMS accelerometer, miniature Fluxgate magnetometers, and MEMS gyroscopes, to provide accurate heading, pitch, and roll of the device under the measure. Integration of gyroscopes’ output provides high-frequency, real-time measurement of the device rotation about all three rotational axes. Accelerometers and Fluxgate magnetometers measure absolute, very accurately in static and dynamic conditions Pitch, Roll, and heading/Azimuth at RMCU initial alignment and provide ongoing corrections to gyroscopes during operation.

RMCU Model

Railway Motion Control Unit
Heading Accuracy 0.3º static / 0.6º dynamic
Pitch & Roll Accuracy 0.05º static / 0.08º dynamic
Gyroscopes <2º/hr Bias in-run stability
Accelerometers 0.005 mg Bias in-run stability (8g)
Magnetometer Mini Fluxgate Magnetometer
Size (mm) 129 × 53 × 49
Weight (gram) 120
Applications Railway, Monitoring, Navigation Safety
Certifications EN 45545, EN 50155, EN 50011
Model RMCU

Use Cases for the RMCU

Railway Crack Monitoring

Commonly used for integrating into robust railway crack detection analysis systems, the RMCU outputs accurate heading, pitch, and roll to help control systems identify the propagation of cracks. With outputs designed to be easily integrated with optical cameras and a maximum output data rate of 4 kHz, you can be confident that you will not miss critical data needed for analysis.

Improved Safety and Reliability for Rail Industry

EN 45545 ensures that Inertial Labs sensing components are protected from the effects of fire and intense heat. The EN 50155 compliance also ensures that these sensors adhere to other environmental compliances about temperature, humidity, shock, and vibration. Lastly, the EN 55011 compliance validates the device’s requirements to ensure that these sensors do not affect electro-discharge machining or other instruments within the set frequency range of 9 kHz and 400 GHz.

Rail Industry

Aiding Data for Navigation Systems

Since much of the railway industry is automated, sensing technologies that output tactical attitude data, such as the RMCU, are critical in creating robust navigation platforms. Since the RMCU complies with EN 45545, EN 50155, and EN 50011 Railway standards, this solution can be trusted to be the perfect solution for the job.

RMCU Supported Software

Inertial Labs supplies drivers and tools for easy integration with commonly used platforms such as ROS, LabVIEW, and Waypoint products. Use the Software Development Kit to create custom solutions for your application.


Waypoint Website

A Software Development Kit (SDK) allows developers to customize the processing workflow to suit their customers or application.
Post-processing is ideal for applications requiring highly accurate post-mission position, velocity, or attitude.


LabVIEW Website

LabVIEW is a graphical programming environment engineers use to develop automated research, validation, and production test systems.


ROS Website

ROS (Robot Operating System) is an open-source software development kit for robotics applications. ROS offers a standard software platform to developers across industries that will carry them from research and prototyping to deployment and production.

Performance Characteristics for the RMCU

Railway Motion Control Unit – Allan Variance Test for Accelerometers and Gyroscopes

Development Kit

Trademark Legal Notice: All product names, logos, and brands are the property of their respective owners. All company, product, and service names used in this document are for identification purposes only. Use of these names, logos, and brands does not imply endorsement. ABS, BeiDou, Cobham Limited, EdgeTech, Galileo, GLONASS, GPS, Hesai, Hexagon, HYPACK, IMAGENEX, Kongsberg Seatex, LabVIEW, Livox, Norbit, NovAtel, NovAtel Inertial Explorer, Ouster, Qinsy, Quanergy, QZSS, R2Sonic, RIEGL, ROCK Robotic, ROS, Septentrio, Ship Motion Control SMC, Teledyne TSS, u-blox, Velodyne, WAASP, Waypoint.

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