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

摘要

The invention relates to an identification system in which a trigger signal (A) is emitted on the object side and is received by a portable code generator (6). Said trigger signal is used on the object side to phase code a reference signal (B). The code generator (6) encodes a response signal (D) using the trigger signal in a phase-coded manner and retransmits the response signal. The received response signal is compared with the generated reference signal in an object-side evaluation unit using an autocorrelation function (PHI). Only if the value of the autocorrelation function is larger than a threshold value (S), an enabling signal is generated.