Systems and methods to determine kinematical parameters using RFID tags
First Claim
1. A method implemented in a radio frequency identification (RFID) system, the method comprising:
- identifying, by an RFID reader, an RFID tag using an interrogating electromagnetic wave generated at an antenna of the RFID reader according to an interrogating signal from the RFID reader;
receiving, in the RFID reader, a radio frequency signal from the RFID tag during interrogation of the RFID tag, wherein the received radio frequency signal is a reflection of the interrogating signal from the RFID tag, wherein the radio frequency signal is generated by the RFID tag by switching an antenna of the RFID tag between an absorptive mode and a reflective mode;
combining the received radio frequency signal and the interrogating signal to generate a combined signal;
generating a profile signal from a profile of the combined signal;
determining magnitude of a portion of the profile signal corresponding to the antenna of the RFID tag being in the reflective mode; and
determining a kinematical parameter of the RFID tag relative to the RFID reader based on the magnitude of the portion of the profile signal.
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Accused Products
Abstract
Systems and methods to determine kinematical parameters of physical objects using radio frequency identification (RFID) tags attached to the objects. In one embodiment, one of a population of RFID tags is selectively instructed by an RFID reader to backscatter the interrogating electromagnetic wave and thus allow the RFID reader to measure the position, speed, acceleration, jerk of the object to which the tag is attached. The RFID reader combines the signal representing the backscattered interrogating electromagnetic wave and the signal representing the interrogating electromagnetic wave transmitted by the RFID reader to determine or monitor one or more of the kinematical parameters of the object.
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Citations
20 Claims
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1. A method implemented in a radio frequency identification (RFID) system, the method comprising:
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identifying, by an RFID reader, an RFID tag using an interrogating electromagnetic wave generated at an antenna of the RFID reader according to an interrogating signal from the RFID reader; receiving, in the RFID reader, a radio frequency signal from the RFID tag during interrogation of the RFID tag, wherein the received radio frequency signal is a reflection of the interrogating signal from the RFID tag, wherein the radio frequency signal is generated by the RFID tag by switching an antenna of the RFID tag between an absorptive mode and a reflective mode; combining the received radio frequency signal and the interrogating signal to generate a combined signal; generating a profile signal from a profile of the combined signal; determining magnitude of a portion of the profile signal corresponding to the antenna of the RFID tag being in the reflective mode; and determining a kinematical parameter of the RFID tag relative to the RFID reader based on the magnitude of the portion of the profile signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A radio frequency identification (RFID) system, comprising:
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an RFID tag; and an RFID reader within a radio communication range from the RFID tag, the RFID reader to identify the RFID tag using an interrogating electromagnetic wave generated according to an interrogating signal having a predetermined frequency and to receive a radio frequency signal from the RFID tag during interrogation of the RFID tag, the RFID reader to sample, at a predetermined time interval, a profile signal of a combination of the received radio frequency signal and the interrogating signal having the predetermined frequency to generate a sampled profile signal and determine a kinematical parameter of the RFID tag relative to the RFID reader based on the sampled profile signal. - View Dependent Claims (12, 13, 14, 15, 16)
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17. A radio frequency identification (RFID) reader, comprising:
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an oscillator to generate an interrogating signal; at least one antenna coupled to the oscillator to generate an interrogating electromagnetic wave according to the interrogating signal; at least one receiver coupled to the at least one antenna to generate at least one received signal according to the interrogating electromagnetic wave backscattered from an RFID tag, wherein the interrogating electromagnetic wave to be backscattered is generated according to the interrogating signal having a predetermined frequency; and a processor coupled to the oscillator and the at least one receiver to identify the RFID tag and to determine a position of the RFID tag based at least in part on a profile signal of one combination of the interrogating signal having the predetermined frequency and the at least one received signals. - View Dependent Claims (18, 19, 20)
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Specification