System for detecting a specific relative position between a radiofrequency reader and a radiofrequency receiver, characterized in that it comprises: - an inductive contactless radiofrequency receiver comprising an antenna winding and a circuit configured so as to selectively modulate the electrical load at the terminals of said antenna winding; - an inductive contactless radiofrequency reader comprising: - a transceiver antenna circuit having nonzero mutual inductance with said antenna winding of the radiofrequency receiver for said specific relative position; - a communication circuit, comprising a radiofrequency emission chain and a radiofrequency reception chain that are connected to the transceiver antenna circuit; - a receiver antenna circuit having mutual inductance with said antenna winding of the radiofrequency receiver that exhibits a minimum for said specific relative position; - a processing circuit connected to said transceiver antenna circuit and configured so as to: - identify the presence of a receiver by detecting nonzero mutual inductance between the transceiver antenna circuit and an antenna winding; - detect a mutual inductance minimum between the receiver antenna circuit and an antenna winding; - determine that the reader and a radiofrequency receiver are in said specific relative position during identification of the presence of a receiver at the same time as the detection of a mutual inductance minimum between the receiver antenna circuit and an antenna winding. - an inductive contactless radiofrequency receiver comprising an antenna winding and a circuit configured so as to selectively modulate the electrical load at the terminals of said antenna winding; - an inductive contactless radiofrequency reader comprising: - a transceiver antenna circuit having nonzero mutual inductance with said antenna winding of the radiofrequency receiver for said specific relative position; - a communication circuit, comprising a radiofrequency emission chain and a radiofrequency reception chain that are connected to the transceiver antenna circuit; - a receiver antenna circuit having mutual inductance with said antenna winding of the radiofrequency receiver that exhibits a minimum for said specific relative position; - a processing circuit connected to said transceiver antenna circuit and configured so as to: - identify the presence of a receiver by detecting nonzero mutual inductance between the transceiver antenna circuit and an antenna winding; - detect a mutual inductance minimum between the receiver antenna circuit and an antenna winding; - determine that the reader and a radiofrequency receiver are in said specific relative position during identification of the presence of a receiver at the same time as the detection of a mutual inductance minimum between the receiver antenna circuit and an antenna winding. - a transceiver antenna circuit having nonzero mutual inductance with said antenna winding of the radiofrequency receiver for said specific relative position; - a communication circuit, comprising a radiofrequency emission chain and a radiofrequency reception chain that are connected to the transceiver antenna circuit; - a receiver antenna circuit having mutual inductance with said antenna winding of the radiofrequency receiver that exhibits a minimum for said specific relative position; - a processing circuit connected to said transceiver antenna circuit and configured so as to: - identify the presence of a receiver by detecting nonzero mutual inductance between the transceiver antenna circuit and an antenna winding; - detect a mutual inductance minimum between the receiver antenna circuit and an antenna winding; - determine that the reader and a radiofrequency receiver are in said specific relative position during identification of the presence of a receiver at the same time as the detection of a mutual inductance minimum between the receiver antenna circuit and an antenna winding. - identify the presence of a receiver by detecting nonzero mutual inductance between the transceiver antenna circuit and an antenna winding; - detect a mutual inductance minimum between the receiver antenna circuit and an antenna winding; - determine that the reader and a radiofrequency receiver are in said specific relative position during identification of the presence of a receiver at the same time as the detection of a mutual inductance minimum between the receiver antenna circuit and an antenna winding.