Patent ID: 7911324

Claim:
A method for obtaining information about a radio-frequency identification (RFID) device or an object on which the RFID device is mounted when the RFID device is in a space of a vehicle defined by a frame of the vehicle, comprising: arranging at least three antennas on the frame to enable transmission of signals into the space and reception of signals from the space; controlling transmission of signals by the antennas by means of an interrogator arranged on the frame of the vehicle; directing radio frequency signals from at least one of the antennas into the space to cause a RFID device in the space to return a signal if it receives any signal from any of the antennas; receiving the return signals from the RFID device; and deriving information about a location on the vehicle of the RFID device or the object to which the RFID device is attached based on the return signals, the step of deriving information about the location on the vehicle of the RFID device or object to which the RFID device is attached comprising determining a distance between each of the antennas and the RFID device and then determining a location of the RFID device based on the determined distance between each of the antennas and the RFID device.