Smart card for receiving and transmitting information, and its use in a system for exploiting polyvalent structures

摘要

A card (S) for reception and transmission of information, comprising memory means (ROM, RAM) and means of communication by electromagnetic waves (A, CA, CS, OM), also comprising a microprocessor (MP) linked to the memory means (ROM, RAM) and to the communications means (CA, CS, OM) as well as a source of electrical energy (AL) for supplying the memory and communications means and the microprocessor. Transmission from the card (S) to a stationary system takes place preferably in passive mode by modification of the reflectivity of an antenna (A). The card may be used to keep information relating to a carrier and for exchanging this information, with the possibility of modifying it and adding to it, in communication with stationary reception and transmission stations arranged to correspond to physical passages controlled by these stations. The intelligence and the autonomy of the card (S) allow exploitation of complex or polyvalent systems whose stations can be laid out in a hierarchical system which makes possibile the autonomous operation of gates or of sectors, also in the event of an interruption in the network communication between the stations. IMAGE