# Use Cases

Precise Train Positioning


Problem We Solve

Reporting the position of every train is an extremely important task, and leads to a number of advantages. First of all, the system prevents collisions between any two trains, in any situation. Secondly, the path of each train is determined and optimized, so that punctuality is assured. Thirdly, the train’s position and speed are carefully monitored.

Why it is Important

Tracking a train’s position is possible via the placement of tags all along the railway. However, the installation and repair costs are expensive, and in some situations the train needs many types of receiver as it travels through different countries. The standard in Europe for train interlocking and signaling is the European Rail Traffic Management System (ERTMS), which relies on GNSS information.

GPS satellites offer a good solution to determine the position of a unit moving on the ground, flying in the air or sailing at sea. Nevertheless, this system shows some weaknesses, such as a lack of accuracy during cloudy weather, or a complete loss of the train’s parameters while it is passing through tunnels, for example.

Whenever the positioning systems are not operational, a back-up system found in the train allows the dead-reckoning technique to be applied. It consists of estimating the position and speed of the train without any external help. Sensors such as tachometers, radars, IMUs and accelerometers are integrated in the engine.

How We Solve it

Designed to address advanced, tactical grade inertial applications, the MS1000 is a new class of high performance accelerometers, based on Safran Colibrys’ 25-year MEMS development and production expertise.

MS1000 implements an innovative microelectromechanical design and electronics which unleash unbeatable performances with regard to the long term bias and scale factor repeatability, in-run bias and vibration rectification error (VRE). The 1000 series accelerometers share the same ceramic leadless hermetic package LCC20 as the 9000 series, hence preserving the same form factor.

MS1000 is available in a rich set of g-ranges +/-2, 5, 10, 30, 100g and is qualified for volume production.

Why Choose Us

  • The MS1000 is designed to withstand extreme forces of acceleration equivalent to many times the force of gravity.
  • The built-in self-test mode generates a square wave signal on the device outputs (OUTP & OUTN) and can be used for device failure detection. This can be helpful to prevent system faults before they occur.
  • The high quality sensor design of our MEMS Accelerometer products support test engineers around the world quickly and flexibly to ensure safety and reliability of vehicles, equipment and buildings.

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