A proximity detection system between at least a first transceiver and at least a second transceiver, the first transceiver and the second transceiver each comprising at least one primary radio module and one secondary radio module, the system wherein: - the primary radio module of the first transceiver is able to communicate with the primary radio module of the second transceiver, in a first frequency band and in a first amplitude; - the secondary radio module of the first transceiver is able to communicate with the secondary radio module of the second transceiver in a second frequency band different from the first frequency band, and in a second amplitude different from the first amplitude; the first transceiver and the second transceiver being configured: - when the primary radio module of the first transceiver and the primary radio module of the second transceiver come closer to each other, falling below a primary communication distance, to estimate a primary distance value between the primary radio module of the first transceiver and the primary radio module of the second transceiver from a measurement of the strength of at least one signal received by the primary radio module of the first transceiver from the primary radio module of the second transceiver; and - if the estimated primary distance value is less than a second communication distance between the secondary radio module of the first transceiver and the secondary radio module of the second transceiver, to: • estimate a secondary distance value between the primary radio module of the first transceiver and the primary radio module of the second transceiver from at least a measurement of the transmission time of a signal transmitted from the secondary radio module of the first transceiver to the secondary radio module of the second transceiver; and, • If the estimated secondary distance value is less than a predetermined notification distance, to estimate a degree of nearness, and notify a detection of proximity if the degree of nearness exceeds a predetermined threshold, and wherein the degree of nearness comprises at least one of the following parameters: a time interval since the crossing of a threshold distance, the crossing of a threshold distance. - the primary radio module of the first transceiver is able to communicate with the primary radio module of the second transceiver, in a first frequency band and in a first amplitude; - the secondary radio module of the first transceiver is able to communicate with the secondary radio module of the second transceiver in a second frequency band different from the first frequency band, and in a second amplitude different from the first amplitude; - when the primary radio module of the first transceiver and the primary radio module of the second transceiver come closer to each other, falling below a primary communication distance, to estimate a primary distance value between the primary radio module of the first transceiver and the primary radio module of the second transceiver from a measurement of the strength of at least one signal received by the primary radio module of the first transceiver from the primary radio module of the second transceiver; and - if the estimated primary distance value is less than a second communication distance between the secondary radio module of the first transceiver and the secondary radio module of the second transceiver, to: • estimate a secondary distance value between the primary radio module of the first transceiver and the primary radio module of the second transceiver from at least a measurement of the transmission time of a signal transmitted from the secondary radio module of the first transceiver to the secondary radio module of the second transceiver; and, • If the estimated secondary distance value is less than a predetermined notification distance, to estimate a degree of nearness, and notify a detection of proximity if the degree of nearness exceeds a predetermined threshold, and wherein the degree of nearness comprises at least one of the following parameters: a time interval since the crossing of a threshold distance, the crossing of a threshold distance. • estimate a secondary distance value between the primary radio module of the first transceiver and the primary radio module of the second transceiver from at least a measurement of the transmission time of a signal transmitted from the secondary radio module of the first transceiver to the secondary radio module of the second transceiver; and, • If the estimated secondary distance value is less than a predetermined notification distance, to estimate a degree of nearness, and notify a detection of proximity if the degree of nearness exceeds a predetermined threshold, and wherein the degree of nearness comprises at least one of the following parameters: a time interval since the crossing of a threshold distance, the crossing of a threshold distance.