Access control system, especially for vehicle, has transmitter in polling station that emits high frequency polling signal containing frequency modulated ramps, code sender, response signal receiver

摘要

The system has a transmitter in a polling station that emits a HF polling signal (2), a code sender with a transponder for receiving the polling signal, providing it with an auxiliary carrier and code information and sending it back and a receiver in the polling station for receiving the response signal (3), determining the object and code sender distance and enabling use of the object depending on the code information and threshold values. The system has a transmitter in a polling station associated with the object that emits a high frequency polling signal containing frequency modulated ramps, a code sender with a transponder for receiving the polling signal when in range, providing it with an auxiliary carrier and code information and sending it back and a receiver in the polling station for receiving the response signal, determining the distance between object and code sender and enabling use of the object depending on the code information and defined threshold values. An independent claim is also included for a method of operating an inventive system.