PASSIVE RADIO FREQUENCY IDENTIFICATION RANGING

摘要

Systems, methods, apparatuses, and computer readable media are disclosed for providing timing-based distance measurement to a passive radio frequency identification (“RFID”) tag using one or more wideband RF signals synchronized with the standard narrowband RF signal. In some embodiments, the narrowband RF signal activates a passive RFID tag creating a backscatter reflection target which returns a modulated narrowband signal and a wideband signal from the passive RFID tag. The one or more wideband receivers determine time-of-flight and/or time-of-arrival measurements for the returned wideband signal. A location measurement is then calculated for the passive RFID tag using the tag data, the known location of the wideband transceivers, and the time-of-flight/time-of-arrival data.

主权项

1. A system comprising:
one or more passive RFID tags; one or more narrowband RFID readers configured to:
transmit one or more narrowband RF signals activating a first passive RFID tag; andreceive a modulated signal from the first passive RFID tag including data associated with the first passive RFID tag; one or more wideband RFID transceivers configured to:
transmit one or more wideband RF signals;receive a return wideband RF signal from the first passive RFID tag; anddetermine a time value associated with the receiving of the return RF wideband signal; and processing circuitry configured to determine a location measurement of the first passive RFID tag based at least on the time value determined by the one or more wideband RFID transceivers.