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Machine translation
1. (WO2012047559) OBJECT LOCALIZATION WITH RFID INFRASTRUCTURE
Note: Text based on automatic Optical Character Recognition processes. Please use the PDF version for legal matters

WHAT IS CLAIMED IS:

1. A system comprising:

a search circuit configured to search a plurality of transmission power levels established by a radio-frequency identification (RFID) reader, the search circuit configured to determine a measurement power level corresponding to a target; and

a target localization circuit configured to determine a region that includes the target using information about a physical relationship between the RFID reader and a reference location via correlating the measurement power level to a reference power level corresponding to the reference location.

2. The system of claim 1, wherein the measurement power level is a transmission power level established by the RFID reader to interrogate the target at or near a limit of the target's sensitivity.

3. The system of claim 1, wherein the localization circuit is configured to select the reference location from a plurality of reference locations via determining a greater affinity between the measurement power level and the reference power level than between the measurement power level and other reference power levels corresponding to other respective reference locations.

4. The system of claim 1, wherein the search circuit is configured to use a linear search to search the plurality of transmission power levels to determine the measurement power level.

5. The system of claim 1, wherein the search circuit is configured to use a binary search to search the plurality of transmission power levels to determine the measurement power level.

6. The system of claim 1, wherein the localization circuit is configured to determine a refined region that includes the target using information about two or more regions established using respective measurement power levels determined corresponding to respective RFID readers.

7. The system of claim 1, further comprising a reference power calibration circuit configured to search the plurality of transmission power levels for the reference power level, the reference power level being a transmission power level established by the RFID reader to interrogate the reference location at or near the limit of the references location's sensitivity.

8. The system of claim 1, wherein at least one of the target or the reference location includes an RFID tag cluster, the RFID tag cluster including at least two RFID tags positioned orthogonally to each other.

9. The system of claim 1, further comprising a sorting circuit configured to classify a plurality of RFID tags into one or more categories, wherein the localization circuit is configured to determine the region that includes the target using information about the physical relationship between the RFID reader and the reference location, and information about a classification of one or more of an RFID tag located at or near the target, or an RFID tag located at or near the reference location.

10. The system of claim 9, wherein the target and reference location comprise respective RFID tags comprising the same category of sensitivity range.

11. A method comprising:

searching a plurality of transmission power levels established by a radio-frequency identification (RFID) reader to determine a measurement power level corresponding to a target; and

determining a region that includes the target using information about a physical relationship between the RFID reader and a reference location via correlating the measurement power level to a reference power level

corresponding to the reference location.

12. The method of claim 11, wherein the measurement power level is a transmission power level established by the RFID reader to interrogate the target at or near a limit of the target's sensitivity.

13. The method of claim 11, wherein the reference location is selected from a plurality of reference locations via determining a greater affinity between the measurement power level and the reference power level than between the measurement power level and other reference power levels corresponding to other respective reference locations.

14. The method of claim 11, wherein searching the plurality of transmission points includes linearly searching the plurality of transmission power levels to determine the measurement power level.

15. The method of claim 11, wherein searching the plurality of transmission points includes a binary search of the plurality of transmission power levels to determine the measurement power level.

16. The method of claim 11 , comprising determining a refined region that includes the target using information about two or more regions established using respective measurement power levels determined corresponding to respective RFID readers.

17. The method of claim 11 , comprising periodically calibrating the reference power level by searching the plurality of transmission power levels for the reference power level, the reference power level being a transmission power level established by the RFID reader to interrogate the reference location at or near the reference location's sensitivity.

18. The method of claim 11 , wherein at least one of the target and the reference location includes an RFID tag cluster, the RFID tag cluster including at least two RFID tags positioned orthogonally to each other.

19. The method of claim 11, comprising sorting a plurality of RFID tags into one or more categories, wherein determining the region includes using information about a categorization of one or more of an RFID tag located at or near the target or an RFID tag located at or near the reference location.

20. The method of claim 19, wherein the target and reference locations comprise respective RFID tags comprising the same category of sensitivity range.

21. A non-transitory machine readable medium including instructions, which when executed by a machine, cause the machine to:

calibrate a reference power level corresponding to a reference location by searching a plurality of transmission power levels established by a radio-frequency identification (RFID) reader for the reference power level, the reference power level being a transmission power level established by the RFID reader to interrogate the reference location at or near the reference location's sensitivity;

searching the plurality of transmission power levels to determine a measurement power level corresponding to a target, the measurement power level being a transmission power level established by the RFID reader to interrogate the target at or near a limit of the target's sensitivity;

determining a region that includes the target using information about a physical relationship between the RFID reader and the reference location via correlating the measurement power level to the reference power level; and

determine a refined region that includes the target by intersecting the region with a second region corresponding to a second RFID reader.