Radio detection and ranging
RFID tags are small transponders
Device interconnecting multiple computer networks.
A GPS system which additionally works with one or more base stations. The stations know their own position to within a centimetre and transmit momentary correction values by wireless or GSM to the vehicle’s GPS receiver. The receiver then determines its own position with the aid of at least four satellites, and corrects it in real time based on the correction value received from the nearby base station.