System for controlling the access of persons at physical access regions, said system comprising: an identification medium having an identification code assigned to a person; a reading device for reading the identification code, wherein the reading device is located at a physical access region, and wherein the reading device is configured to send the identification code read and the location of the reading device to an access control server; a positioning device (SAT, IPS) for determining the location of a mobile device assigned to the person; the access control server, wherein the access control server is configured to receive the identification code of the identification medium and the location of the mobile device, to compare the received location of the mobile device with the location of the reading device, and to generate an access authorisation for the person if the location of the mobile device assigned to the person and the location of the reading device match, and if a positive authentication of the person on the basis of the identification code has been established, characterised in that an access authorisation is provided for the person by means of the access control server if the location of the mobile device assigned to the person and the location of the reading device match, and a positive authentication of the person on the basis of the identification code has occurred, wherein the location of the mobile device assigned to the person is provided by two different positioning devices (SAT, IPS), and that the two different positioning devices (SAT, IPS) determine the location of the mobile device assigned to the person in each case on the basis of different technologies or different positioning methods. an identification medium having an identification code assigned to a person; a reading device for reading the identification code, wherein the reading device is located at a physical access region, and wherein the reading device is configured to send the identification code read and the location of the reading device to an access control server; a positioning device (SAT, IPS) for determining the location of a mobile device assigned to the person; the access control server, wherein the access control server is configured to receive the identification code of the identification medium and the location of the mobile device, to compare the received location of the mobile device with the location of the reading device, and to generate an access authorisation for the person if the location of the mobile device assigned to the person and the location of the reading device match, and if a positive authentication of the person on the basis of the identification code has been established, characterised in that an access authorisation is provided for the person by means of the access control server if the location of the mobile device assigned to the person and the location of the reading device match, and a positive authentication of the person on the basis of the identification code has occurred, wherein the location of the mobile device assigned to the person is provided by two different positioning devices (SAT, IPS), and that the two different positioning devices (SAT, IPS) determine the location of the mobile device assigned to the person in each case on the basis of different technologies or different positioning methods.