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The project’s goal is to assess the creation of a failsafe Train Localisation On Board Unit (TLOBU) that will be interoperable across the entire European railway network. The TLOBU will provide trains and railway operators with critical information such as positioning and velocity, complemented by acceleration, heading and attitude for non-safe applications. 

At the end of the project, and based on the experience gained during the demonstration phase, the consortium will be able to collect and review data that will help rail operators and industry to gain insights and push towards a new version of the ERTMS standards.

Read this: EGNOS and Galileo on the ambitious Digital Rail agenda

How does it work?

The proposed solution is based on multi-sensor fusion using measurements from a GNSS receiver, an Inertial Measurement Unit (IMU) and a tachometer with the support of a digital map of the rail tracks. 

The localisation system consists of a data fusion algorithm associated with an integrity algorithm, ensuring the SIL4 level of safety of the main outputs of the TLOBU. The integrity algorithm uses EGNOS, the European Satellite Based Augmentation System.

Data from the TLOBU are transmitted to specific train safety functions such as the European Vital Computer (EVC), part of the Automatic Train Protection function (ATP). In parallel, the fusion algorithm is also providing other outputs to other train functions that do not require a SIL4 level of safety, such as Train Management System (TMS) or the passenger information system.

The system architecture and algorithms are defined by Airbus Defence & Space, and NAVENTIK. Both companies are providing two different solutions for the fusion algorithms, whereas the integrity concept is defined by Airbus Defence & Space. This concept is based on the EGNOS services; however, the currently available services have only been defined for aviation means and requires specific refinements to be optimised for rail environments. This EGNOS service is the cornerstone of the integrity concept of CLUG to reach the necessary SIL4 level of safety. Airbus D&S detailed this EGNOS service for rail in specific deliverables, which will be published in the coming months.

Minimising costs

Using EU space technology in the railway sector not only increases safety but can significantly reduce maintenance and other operational costs. This new approach for train localisation is set to improve the current system based on balise readers. The goal of the TLOBU is to ultimately replace the current localisation system, and thus to promote and accelerate the deployment of ERTMS in Europe by introducing more accurate train localisation. Such an innovative system should also help drastically reduce the ground equipment, currently ensuring the safe train localisation, such as axel counters and track circuits. Although one of the goals is to decrease as much as possible the use of balises along the tracks, the system will still make use of some balises to help maintain a precise and safe position in GNSS-denied environments such as tunnels and train stations.

About project CLUG

The Horizon 2020 consortium consists of ten companies from four European countries (France, Germany, Switzerland and Spain): three Rail Operator or Infrastructure Manager (SNCF, DB Netz and SBB), two rail industrials (CAF and Siemens), one major European aerospace company (Airbus D&S), one research institute related to aeronautics (ENAC), one certification organism (NavCert), and two localisation experts (FDC and NAVENTIK). 

Visit the project’s website to find out more.

The project’s goal is to assess the creation of a failsafe Train Localisation On Board Unit (TLOBU) that will be interoperable across the entire European railway network. The TLOBU will provide trains and railway operators with critical information such as positioning and velocity, complemented by acceleration, heading and attitude for non-safe applications. 

At the end of the project, and based on the experience gained during the demonstration phase, the consortium will be able to collect and review data that will help rail operators and industry to gain insights and push towards a new version of the ERTMS standards.

Read this: EGNOS and Galileo on the ambitious Digital Rail agenda

How does it work?

The proposed solution is based on multi-sensor fusion using measurements from a GNSS receiver, an Inertial Measurement Unit (IMU) and a tachometer with the support of a digital map of the rail tracks. 

The localisation system consists of a data fusion algorithm associated with an integrity algorithm, ensuring the SIL4 level of safety of the main outputs of the TLOBU. The integrity algorithm uses EGNOS, the European Satellite Based Augmentation System.

Data from the TLOBU are transmitted to specific train safety functions such as the European Vital Computer (EVC), part of the Automatic Train Protection function (ATP). In parallel, the fusion algorithm is also providing other outputs to other train functions that do not require a SIL4 level of safety, such as Train Management System (TMS) or the passenger information system.

The system architecture and algorithms are defined by Airbus Defence & Space, and NAVENTIK. Both companies are providing two different solutions for the fusion algorithms, whereas the integrity concept is defined by Airbus Defence & Space. This concept is based on the EGNOS services; however, the currently available services have only been defined for aviation means and requires specific refinements to be optimised for rail environments. This EGNOS service is the cornerstone of the integrity concept of CLUG to reach the necessary SIL4 level of safety. Airbus D&S detailed this EGNOS service for rail in specific deliverables, which will be published in the coming months.

Minimising costs

Using EU space technology in the railway sector not only increases safety but can significantly reduce maintenance and other operational costs. This new approach for train localisation is set to improve the current system based on balise readers. The goal of the TLOBU is to ultimately replace the current localisation system, and thus to promote and accelerate the deployment of ERTMS in Europe by introducing more accurate train localisation. Such an innovative system should also help drastically reduce the ground equipment, currently ensuring the safe train localisation, such as axel counters and track circuits. Although one of the goals is to decrease as much as possible the use of balises along the tracks, the system will still make use of some balises to help maintain a precise and safe position in GNSS-denied environments such as tunnels and train stations.

About project CLUG

The Horizon 2020 consortium consists of ten companies from four European countries (France, Germany, Switzerland and Spain): three Rail Operator or Infrastructure Manager (SNCF, DB Netz and SBB), two rail industrials (CAF and Siemens), one major European aerospace company (Airbus D&S), one research institute related to aeronautics (ENAC), one certification organism (NavCert), and two localisation experts (FDC and NAVENTIK). 

Visit the project’s website to find out more.