RFID LABEL TIME SYNCHRONIZATION
First Claim
Patent Images
1. A method comprising:
- in a radio frequency identification (RFID) interrogator having an antenna, transceiver, a clock, a memory and a central processing unit (CPU), initializing a RFID tag with a label start time and a time to record data, the label start time representing an actual start time indicated by the clock;
receiving a label stop time, a label time and logged data from an interrogation of the RFID tag; and
compensating the label time for a drift between the label stop time and an actual stop time.
3 Assignments
0 Petitions
Accused Products
Abstract
Methods and apparatus, including computer program products, for radio frequency identification (RFID) label time synchronization. A method includes, in a radio frequency identification (RFID) interrogator having an antenna, transceiver, a clock, a memory and a central processing unit (CPU), initializing a RFID tag with a label start time and a time to record data, the label start time representing an actual start time indicated by the clock, receiving a label stop time, a label time and logged data from an interrogation of the RFID tag, and compensating the label time for a drift between the label stop time and an actual stop time.
-
Citations
23 Claims
-
1. A method comprising:
-
in a radio frequency identification (RFID) interrogator having an antenna, transceiver, a clock, a memory and a central processing unit (CPU), initializing a RFID tag with a label start time and a time to record data, the label start time representing an actual start time indicated by the clock; receiving a label stop time, a label time and logged data from an interrogation of the RFID tag; and compensating the label time for a drift between the label stop time and an actual stop time. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
-
-
9. A computer program product, tangibly embodied in an information carrier, for adjusting a time in a radio frequency identification (RFID) system, the computer program product being operable to cause data processing apparatus to:
-
in a radio frequency identification (RFID) interrogator having an antenna, transceiver, a clock, a memory and a central processing unit (CPU), initialize a RFID tag with a label start time and a time to record data, the label start time representing an actual start time indicated by the clock; receive a label stop time, a label time and logged data from an interrogation of the RFID tag; and compensate the label time for a drift between the label stop time and an actual stop time. - View Dependent Claims (10, 11, 12, 13, 14, 15)
-
-
16. A radio frequency identification (RFID) interrogator comprising:
-
an antenna linked to a transceiver; and a programmable memory and central processing unit linked to the transceiver, memory programmed to adjust times in an interrogated RFID label in which data including time is logged. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23)
-
Specification