Radio Frequency Identification Tag Location Estimation and Tracking System and Method
First Claim
1. A method of locating one or more radio frequency identification (RFID) tags comprising:
- illuminating at least one RFID tag by an exciter;
receiving information signals from the illuminated at least one RFID tag by a plurality of receive antennas;
determining a phase derivate for the received information signals from the at least one illuminated RFID tag received by each of the plurality of receive antennas; and
identifying a location of the at least one RFID tag based on the determined phase derivates of the received information signals.
6 Assignments
0 Petitions
Accused Products
Abstract
Systems and methods for locating one or more radio frequency identification (RFID) tags are provided. A phase difference of received information signals of illuminated RFID tags is utilized to locate the RFID tags. One or more exciters transmit interrogation signals to illuminate the RFID tags in which the exciters may have a plurality of antenna selectively configured to transmit through two or more antennas and to receive on one antenna. Multiple reads of the same RFID tag can also be performed to generate a probability model of the location of the RFID tag. An enhanced particle filter is applied to probability model to determine the exact location of the RFID.
-
Citations
20 Claims
-
1. A method of locating one or more radio frequency identification (RFID) tags comprising:
-
illuminating at least one RFID tag by an exciter; receiving information signals from the illuminated at least one RFID tag by a plurality of receive antennas; determining a phase derivate for the received information signals from the at least one illuminated RFID tag received by each of the plurality of receive antennas; and identifying a location of the at least one RFID tag based on the determined phase derivates of the received information signals. - View Dependent Claims (2, 3, 4, 5, 6)
-
-
7. A radio frequency identification (RFID) system for locating one or more RFID tags, the system comprising:
-
at least one exciter having a plurality of antennas and configured to selectively transmit interrogation signals through at least two of the plurality of antennas and to selectively receive information signals from at least one RFID tag through one of the plurality of antennas different from the at least two of the plurality of antennas; and a reader in communication with the at least one exciter and configured to activate the at least one exciter, the reader locating the at least one RFID tag based on a phase derivate of the received information signals. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14)
-
-
15. A radio frequency identification (RFID) system for locating one or more RFID tags, the system comprising:
-
at least one RFID tag; an antenna array configured to illuminate the at least one RFID tag; a transmitter coupled to the antenna array and configured to activate the antenna array to repeatedly illuminate the at least one RFID tag within a specific time frame and a specific space; and a reader in communication with the transmitter and configured to generate a probability model based on information signals received from the repeated illumination of the at least one RFID tag and the reader applies a particle filter on the generated probability model to determine a location of the at least one RFID tag based on a result of the applied particle filter. - View Dependent Claims (16, 17, 18, 19, 20)
-
Specification