How do you prevent interruption of the OBU functions or GPS signal interference as a result of tampering?
To start with, the OBU is protected against mechanical tampering by means of tampering sensors. The data saved in the OBU is stored in encrypted format is special, tampering-protected storage areas while data communication with the outside is encrypted and requires authentication. Tampering attempts and extraordinary events such as the power supply being switched off, device faults or failure of GPS supply are saved in a log file and transferred to data processing center where they are evaluated with the help of fraud detection systems. In addition, data processing center evaluates redundant data and carries out extended plausibility checks in order to uncover any tampering attempts. Any manipulation of the GPS signals to that extent that the position the OBU derives from the signals is always next to the real position is extremely costly and has never been observed so far. It is theoretically feasible to block the signals by means of a jammer, both stationary and in relation to vehicl
