Identification system for verifying an authorization for access to an object, or use of an object, in particular a motor vehicle

摘要

A portable encoder transmits a response signal, which contains code information that is specific to the encoder (2). The code information contained in the received response signal is compared with reference code information in a receiving unit (4), which is located in the object and is connected to an evaluation unit (9). In addition, both the distance of the encoder (2) from the receiving unit (4) and the receiving level of the response signal are measured on the object side and the position of the encoder (2) is calculated from the measurements. This permits a differentiation to be made between the exterior and interior regarding the position of the encoder (2). Access is released and authorization is granted, only if the position of the encoder (2) is identified as permissible.