Method for determining distance between two vehicles, involves defining distance between two vehicles based on values of transmission intensity of electromagnetic field at different time periods

摘要

The method involves changing transmission intensity of electromagnetic field (3) by a radio frequency identification (RFID)-reader (1). A RFID-transponder (2) is activated based on a value of the transmission intensity of the electromagnetic field at a time period. Information is back-transmitted to the RFID-reader. The RFID-transponder is not activated based on another value of the transmission intensity of the electromagnetic field at another time period. The information is not back-transmitted to the RFID-reader. A distance between two vehicles is defined based on the values. An independent claim is also included for a radio frequency identification-reader for determining a distance between two vehicles.