Validation of a vehicle position

A validation device for validating an assumed vehicle position specified by a position-determination unit of a vehicle, comprising:

• an extraction unit, which is configured to determine a transmitter position of the transmitter from the V2X message, upon reception of a V2X message transmitted by a transmitter and received by a receiver of the vehicle;
• an analysis unit, which is configured to determine at least one actual physical received signal property when the V2X message is received;
• a geodata unit, which is configured to provide local environmental geodata comprising a positioning of a number of stationary objects;
• a simulation unit, which is connected to the extraction unit and to the geodata unit and which is configured to simulate a signal path of the V2X message using the transmitter position, the local environmental geodata and the assumed vehicle position, and to determine at least one simulated physical received signal property from the simulated signal path and the assumed vehicle position;
• a validation unit, which is connected to the simulation unit and to the analysis unit and which is configured to validate the assumed vehicle position (P1), if the at least one simulated physical received signal property differs from the at least one actual physical received signal property by less than a limit value.