System for locating an object furnished with an rfid tag

A system for locating at least one object in a predetermined space, the system comprising:

• at least one RFID tag positioned in or on an object to be located in the predetermined space;
• an RFID reader capable of emitting at least one radiofrequency interrogation signal to the RFID tag and of receiving a radiofrequency response signal from the RFID tag;
• at least one ultrasound generator capable of emitting in a given direction ultrasound signals of frequencies f1 and f2 in the predetermined space, where f1>f2, so as to generate a directive parametric signal of frequency f1−f2 in a specific zone, called a zone of sound, of the predetermined space, the so-called inaudible frequencies f1 and f2 being greater than 20 kHz and the so-called audible frequency difference f1−f2 being less than 20 kHz,
• wherein the at least one tag is further equipped with an acoustic sensor able to capture the signals of frequency f1−f2, the acoustic sensor being designed together with the RFID tag to modify the content or the level of the RFID tag response signal when the acoustic sensor receives a signal of frequency f1−f2, the RFID reader being thus able to locate the object in said zone of sound when it receives the modified response signal from the RFID tag.