Positioning system for determining the position of a vehicle as it enters a charging station, which is suitable for charging an energy accumulator of the vehicle, wherein - the positioning system has a vehicle-side marking, in which at least one marking property changes in the vehicle longitudinal direction, and - the positioning device has, on the route side, a sensor device which - as the vehicle travels past the sensor device - - measures the distance of the marking from the sensor device and generates a distance signal (A(t)), which indicates the distance of the marking from the sensor device in the vehicle transverse direction, and - reads out the marking property in the vehicle longitudinal direction and generates a vehicle longitudinal direction signal (B(t)), which indicates the position of the marking and/or the vehicle in relation to the sensor device in the vehicle longitudinal direction, wherein: - the marking property, which is dependent on the vehicle longitudinal direction, is determined by the surface profile of the marking in the vehicle transverse direction and - the vehicle longitudinal direction signal (B(t)) is generated by analyzing the distance signal (A(t)), wherein the surface profile of the marking in the vehicle transverse direction has a height coding along the vehicle longitudinal direction, on the basis of which the position of the marking can be determined in the vehicle longitudinal direction in relation to the sensor device and characterized in that the surface profile of the marking is bent about a bending axis, which corresponds to the vehicle longitudinal axis or is parallel to the vehicle longitudinal axis, so that a correct acquisition of the marking may also be ensured in the case of lowering or tilting of the vehicle. - the positioning system has a vehicle-side marking, in which at least one marking property changes in the vehicle longitudinal direction, and - the positioning device has, on the route side, a sensor device which - as the vehicle travels past the sensor device - - measures the distance of the marking from the sensor device and generates a distance signal (A(t)), which indicates the distance of the marking from the sensor device in the vehicle transverse direction, and - reads out the marking property in the vehicle longitudinal direction and generates a vehicle longitudinal direction signal (B(t)), which indicates the position of the marking and/or the vehicle in relation to the sensor device in the vehicle longitudinal direction, - measures the distance of the marking from the sensor device and generates a distance signal (A(t)), which indicates the distance of the marking from the sensor device in the vehicle transverse direction, and - reads out the marking property in the vehicle longitudinal direction and generates a vehicle longitudinal direction signal (B(t)), which indicates the position of the marking and/or the vehicle in relation to the sensor device in the vehicle longitudinal direction, - the marking property, which is dependent on the vehicle longitudinal direction, is determined by the surface profile of the marking in the vehicle transverse direction and - the vehicle longitudinal direction signal (B(t)) is generated by analyzing the distance signal (A(t)),