RFID device time synchronization from a public source
First Claim
Patent Images
1. A radio frequency identification (RFID) device comprising:
- an antenna tuned to receive a radio frequency (RF) time-code signal from a public source;
a receiving circuit linked to the antenna, wherein the receiving circuit is configured to convert the received RF time-code signal into a digital time-code bit stream;
a controller circuit linked to the receiving circuit, wherein the controller circuit is configured to decode the digital time-code bit stream;
an internal clock linked to the controller circuit, wherein a time maintained by the internal clock is updated based on the decoded time-code bit stream received from the controller circuit;
a microcontroller linked to the receiving circuit;
a memory linked to the microcontroller; and
a battery linked to and powering the receiving circuit, controller circuit, internal clock, microcontroller and memory.
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Abstract
A radio frequency identification (RFID) device includes an antenna linked to a receiving circuit, the antenna tuned to receive a radio frequency (RF) time-code signal from a public source, a controller circuit and an internal clock linked to the receiving circuit, a microcontroller linked to the receiving circuit, a memory linked to the microcontroller, and a battery linked to and powering the receiving circuit, controller circuit, internal clock, microcontroller and memory.
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Citations
17 Claims
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1. A radio frequency identification (RFID) device comprising:
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an antenna tuned to receive a radio frequency (RF) time-code signal from a public source; a receiving circuit linked to the antenna, wherein the receiving circuit is configured to convert the received RF time-code signal into a digital time-code bit stream; a controller circuit linked to the receiving circuit, wherein the controller circuit is configured to decode the digital time-code bit stream; an internal clock linked to the controller circuit, wherein a time maintained by the internal clock is updated based on the decoded time-code bit stream received from the controller circuit; a microcontroller linked to the receiving circuit; a memory linked to the microcontroller; and a battery linked to and powering the receiving circuit, controller circuit, internal clock, microcontroller and memory. - View Dependent Claims (2, 3)
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4. A radio frequency identification (RFID) device comprising:
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a Global Positioning System (GPS) receiver configured to receive a radio frequency (RF) time-code signal from a Global Navigation Satellite System (GNSS), wherein the GPS receiver is configured to convert the received RF time-code signal into a digital time-code bit stream; a controller circuit linked to the GPS receiver, wherein the controller circuit is configured to decode the digital time-code bit stream; an internal clock linked to the controller circuit, wherein a time maintained by the internal clock is updated based on the decoded time-code bit stream received from the controller circuit; a microcontroller linked to the receiving circuit; a memory linked to the microcontroller; and a battery linked to and powering the GPS circuit, controller circuit, internal clock, microcontroller and memory.
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5. A radio frequency identification (RFID) device comprising:
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a LORAN-C receiver configured to receive a radio frequency (RF) time-code signal, wherein the LORAN-C receiver is configured to convert the received RF time-code signal into a digital time-code bit stream; a controller circuit linked to the LORAN-C receiver, wherein the controller circuit is configured to decode the digital time-code bit stream; an internal clock linked to the controller circuit, wherein a time maintained by the internal clock is updated based on the decoded time-bit stream received from the controller circuit; a microcontroller linked to the receiving circuit; a memory linked to the microcontroller; and a battery linked to and powering the LORAN-C circuit, controller circuit, internal clock, microcontroller and memory.
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6. A radio frequency identification (RFID) device comprising:
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an antenna tuned to receive a radio frequency (RF) time-code signal from a public source; a receiving circuit linked to the antenna, wherein the receiving circuit is configured to convert the received RF time-code signal into a digital time-code bit stream; a controller circuit linked to the receiving circuit, wherein the controller circuit is configured to decode the digital time-code bit stream; an internal clock linked to the controller circuit, wherein a time maintained by the internal clock is updated based on the decoded time-code bit stream received from the controller circuit; a microcontroller linked to the receiving circuit; and a memory linked to the microcontroller. - View Dependent Claims (7, 8, 9)
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10. A method comprising:
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in a radio frequency identification (RFID) device, receiving a radio frequency (RF) time-code signal from a public source; converting the received RF time-code signal into a digital time-code bit stream; decoding the digital time-code bit stream; and updating a time maintained by an internal clock based on the decoded time-code bit stream. - View Dependent Claims (11, 12, 13)
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14. A system comprising:
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a radio frequency identification (RFID) device comprising; an antenna tuned to receive a radio frequency (RF) time-code signal from a public source, a receiving circuit linked to the antenna, wherein the receiving circuit is configured to convert the received RF time-code signal into a digital time-code bit stream, a controller circuit linked to the receiving circuit, wherein the controller circuit is configured to decode the digital time-code bit stream, and an internal clock linked to the controller circuit, wherein a time maintained by the internal clock is updated based on the decoded time-code bit stream received from the controller circuit; a RFID interrogator configured to interrogate the RFID device and receive in response an RFID identification and a time stamp, wherein the time stamp corresponds to the time maintained by the internal clock; and a subsystem linked to the RFID interrogator, wherein the subsystem is configured to store the RFID identification and time stamp received from the RFID interrogator. - View Dependent Claims (15, 16, 17)
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Specification