Patent ID: 7005968
Filing Date: 2006-02-28
Classification: G01S,G06K,H01Q

Abstract:
1. A method for tracking an asset with a radio frequency identification/radio frequency data communication (RFID/RFDC) device and a plurality of marker tags, comprising: sending an interrogation signal from the RFID/RFDC device that has an interrogation range; receiving a first response signal to the interrogation signal from a first marker tag located at a first known location within the interrogation range; processing the first response signal with the RFID/RFDC device to determine a first identity of the first marker tag; receiving a second response signal to the interrogation signal from a second marker tag located at a second known location within the interrogation range; processing the second response signal with the RFID/RFDC device to determine a second identity of the second marker tag; and processing the first identity of the first marker tag and the second identity of the second marker to track the asset.