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US 10,650,200 B2Granted
Systems and methods to determine motion parameters using RFID tags
AssigneeMicron Technology, Inc.
InventorJohn R. Tuttle
Life of this patent
Estimating the term…
Abstract
Systems and methods to determine motion parameters of physical objects using radio frequency identification (RFID) tags attached to the objects. In one embodiment, a method implemented in a radio frequency identification (RFID) system includes determining a motion parameter of the RFID tag based on detecting a Doppler frequency shift in a radio frequency signal received from the RFID tag.
Claims7
A reader, comprising:
- a transceiver coupled with an antenna;
- an oscillator to generate a signal;
- a modulator coupled between the oscillator and the transceiver to modulate the signal transmitted via the antenna;
- a modulation remover coupled with the transceiver to remove modulations from a reflected version of the signal received in the transceiver and generate a modulation-free version of the signal received in the transceiver;
- a frequency detector coupled with the modulation remover to determine a Doppler frequency shift between the signal generated by the oscillator and the modulation-free version of the signal received in the transceiver;
- and
- wherein the reader determines an identity of a device reflecting the signal transmitted via the antenna and a position of the device based on the Doppler frequency shift.
4 more elements
A method implemented in a reader, the method comprising:
- generating, by an oscillator of the reader, a signal;
- modulating, by a modulator coupled between the oscillator and a transceiver of the reader, the signal transmitted via an antenna coupled with the transceiver;
- removing, by a modulation remover coupled with the transceiver, modulations from a reflected version of the signal received in the transceiver to generate a modulation-free version of the signal received in the transceiver;
- determining, by a frequency detector coupled with the modulation remover, a Doppler frequency shift between the signal generated by the oscillator and the modulation-free version of the signal received in the transceiver;
- and
- determining, by the reader, an identity of a device reflecting the signal transmitted via the antenna and a position of the device based on the Doppler frequency shift.
3 more elements
A system, comprising:
- a plurality of devices in a field, each of the devices having a unique identification among the plurality of devices;
- and
- a reader, including:
- a transceiver coupled with an antenna;
- an oscillator to generate a signal;
- a modulator coupled between the oscillator and the transceiver to modulate the signal transmitted via the antenna;
- a modulation remover coupled with the transceiver to remove modulations from a reflected version of the signal received in the transceiver and generate a modulation-free version of the signal received in the transceiver;
- a frequency detector coupled with the modulation remover to determine a Doppler frequency shift between the signal generated by the oscillator and modulation-free version of the signal received in the transceiver;
- and
- wherein the reader determines an identity of a device, among the plurality of devices, reflecting the signal transmitted via the antenna and a position of the device based on the Doppler frequency shift.
7 more elements
Dependencies are inferred from the claim text.