Systems and methods to determine motion parameters using RFID tags
First Claim
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1. A method implemented in a radio frequency identification (RFID) system, the method comprising:
- interrogating an RFID device by an RFID reader using radio frequency electromagnetic waves;
receiving at least one radio frequency signal from the RFID device, comprising receiving a first signal at a first antenna and a second signal at a second antenna;
determining a frequency difference between the first signal received at the first antenna and the second signal received at the second antenna;
detecting a Doppler frequency shift based on the frequency difference; and
calculating a motion parameter of the RFID device, based on the Doppler frequency shift.
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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.
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Citations
16 Claims
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1. A method implemented in a radio frequency identification (RFID) system, the method comprising:
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interrogating an RFID device by an RFID reader using radio frequency electromagnetic waves; receiving at least one radio frequency signal from the RFID device, comprising receiving a first signal at a first antenna and a second signal at a second antenna; determining a frequency difference between the first signal received at the first antenna and the second signal received at the second antenna; detecting a Doppler frequency shift based on the frequency difference; and calculating a motion parameter of the RFID device, based on the Doppler frequency shift. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A radio frequency identification (RFID) system, comprising:
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an RFID device; and an RFID reader within a radio communication range from the RFID device, the RFID reader configured to identify the RFID device using an interrogating electromagnetic wave transmitted from the RFID reader and to receive at least one radio frequency signal from the RFID device during interrogation of the RFID device, including a first signal received at a first antenna and a second signal received at a second antenna, the RFID reader configured to determine a frequency difference between the first signal received at the first antenna and the second signal received at the second antenna, determine a Doppler frequency shift based on the frequency difference signal and calculate a motion parameter of the RFID device based on the determined Doppler frequency shift. - View Dependent Claims (11, 12, 13)
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14. A radio frequency identification (RFID) reader, comprising:
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an oscillator to generate an interrogating electromagnetic wave; at least one antenna and a transceiver coupled to the oscillator to transmit the interrogating electromagnetic wave and to receive at least one radio frequency signal from an RFID device, including a first signal received at a first antenna and a second signal received at a second antenna; and a processor coupled to the memory and transceiver to identify the RFID device and configured to determine a frequency difference between the first signal received at the first antenna and the second signal received at the second antenna, determine a Doppler frequency shift based on the frequency difference and determine a speed of the RFID device from the Doppler frequency shift. - View Dependent Claims (15)
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16. A machine readable media storing instructions, the instructions causing a radio frequency identification (RFID) system to perform a method, the method comprising:
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interrogating an RFID device by an RFID reader via radio frequency electromagnetic waves; receiving at least one radio frequency signal from the RFID device, including receiving a first signal at a first antenna and a second signal at a second antenna; determining a frequency difference between the first signal received at the first antenna and the second signal received at the second antenna; detecting a Doppler frequency shift based on the frequency difference; and calculating a motion parameter of the RFID device, based on the Doppler frequency shift.
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Specification