R&D in ERTMS software and hardware test solutions

Software Tools:

  • DEM (DMI Event Manager)
  • SA-TAV (Semi-automatic Trip and Analysis Validation)
  • LIT (Log Importation Tool)

Hardware Tools:

  • REC Sniffer (RBC/EVC Communication protocol analyzer)
  • ERTMS Adaptor Box
  • MultiRailLab Balise

DEM (DMI Event Manager)
DEM (DMI Event Manager) : The aim of this tool is to record and identify the events (icons, text, gauges) in the DMI (Driver Machine Interface) from the video images of the taken by the tool itself. This tool combines 3 diferents steps, namely :

  • The digital stabilisation and homographic transformation of the original image, therefore recovering the full DMI image, even in case of vibrations and in case the camera is not right in front of the DMI screen by for example by its side.
  • Stereo recording for removing the hands of the driver/robot arm that operates the DMI. In this step a complete DMI image is reconstructed and the detection of the point of contact between the driver and the DMI screen is detected. Both informations will be useful for the validation of onboard train computers (EVCs).
  • Event recognition is performed for icons (ERTMS level, OS, FS…), text messages and gauges among others. These events are then stored in a database for easy manipulation.

Flexiblility: The tools is specialised for the recognition of DMI images, but it can be easily generalised to the detection of other screen images and its respective recognition. The time necessary to adapt the tool to another screen definition is of just a couple of days.

Currently the mains use of DEM is to speed up the anotation of the video images and in particular of DMI image necessary to validate the operation of train onboard computers such as the EVC (European Vital Computer) on high speed trains. Other uses may be the validation of DMI interface, ergonomy testing…

DEM (DMI Event Manager)
The DEM developed by Multitel can remove the hands of the driver, recover the full DMI image to identify and record events automatically for faster black box ETCS testing.

SA-TAV (Semi Automatic Trip and Analysis Validator)
SA-TAV (Semi Automatic Trip and Analysis Validator) : The aim of this tool is to process all the information exchanged by the EVC and perform a validation of its behaviour.
SA-TAV takes as input all data exchanged with the train, such as the TIU (Train Interface Unit) data, JRU ( Juridical Recording Unit), GSM-R radio communication, BTM (Balise Transmission Module) data and the DMI (Driver Machine Interface) interface through the database provided by the DEM (DMI Event Manager software) database.
SA-TAV provides a way to match the behaviour of the EVC against the expected scenarios step-by-step. The match is automated by filters for each EVC interface. SA-TAV brings the information in filtered and convenient way to the ERTMS expert to validate or not its behaviour. The scenarios can be of two kinds :

  • Subset-076 test sequences, for which SA-TAV comes with all necessary filters and expected values, so that the expert only needs to mach the observed values against the expected ones.
  • Project data from a track, for which SA-TAV can use the existing filters to reduce the amount of information that the ERTMS expert needs to evaluate to identify if the track and/or the train behaves as expected.

SA-TAV provides at the end a text report with all evidences of the matches or mismatches of the tests. These evidences include the recorded DMI image frames of the transition of an event, e.g. when an icon indicating the OS (On Sight) mode changed to FS (Full Supervision) or any other mode; These evidences also include the GSM-R communications, the BTM telegrams and the JRU stored data, all with its parameters decoded and with expected values shown side-by-side for easy comparison.

In summary we can say that SA-TAV is a tool that speeds up the process of validation, assures the completeness of the test and enables the ERTMS expert to focus on the relevant information up to the detail level if necessary.