Systems and methods to determine kinematical parameters
First Claim
Patent Images
1. A reader, comprising:
- an antenna circuitry to transmit an interrogating electromagnetic wave according to an interrogating signal having a predetermined frequency;
a receiver circuitry to obtain a received signal generated by a radio frequency device from the interrogating electromagnetic wave, the radio frequency device having an identification; and
a processor coupled to the receiver to;
determine the identification of the radio frequency device from the received signal;
combine a portion of the interrogating signal having the predetermined frequency with a portion of the received signal to generate a combined signal; and
compute a position or speed of the radio frequency device based at least in part on a characteristic parameter of the combined signal;
wherein the characteristic parameter, based on which the position or speed of the radio frequency device is computed, is based on a time duration of a number of characteristic points in the combined signal.
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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, and/or 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 reader, comprising:
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an antenna circuitry to transmit an interrogating electromagnetic wave according to an interrogating signal having a predetermined frequency; a receiver circuitry to obtain a received signal generated by a radio frequency device from the interrogating electromagnetic wave, the radio frequency device having an identification; and a processor coupled to the receiver to; determine the identification of the radio frequency device from the received signal; combine a portion of the interrogating signal having the predetermined frequency with a portion of the received signal to generate a combined signal; and compute a position or speed of the radio frequency device based at least in part on a characteristic parameter of the combined signal; wherein the characteristic parameter, based on which the position or speed of the radio frequency device is computed, is based on a time duration of a number of characteristic points in the combined signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A system, comprising:
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at least one radio frequency device, the radio frequency device having an identification; and a reader having; an antenna circuitry to transmit an interrogating electromagnetic wave according to an interrogating signal having a predetermined frequency; a receiver circuitry to obtain a received signal generated by the radio frequency device from the interrogating electromagnetic wave; and a processor coupled to the receiver to; determine the identification of the radio frequency device from the received signal; combine a portion of the interrogating signal having the predetermined frequency with a portion of the received signal to generate a combined signal; and compute a position or speed of the radio frequency device based at least in part on a characteristic parameter of the combined signal; wherein the characteristic parameter, based on which the position or speed of the radio frequency device is computed, is based on a time duration of a number of characteristic points in the combined signal. - View Dependent Claims (11, 12, 13, 14, 15)
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16. A method, comprising:
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transmitting an interrogating electromagnetic wave according to an interrogating signal having a predetermined frequency; receiving a received signal generated by a radio frequency device from the interrogating electromagnetic wave, the radio frequency device having an identification; determining the identification of the radio frequency device from the received signal; combining a portion of the interrogating signal having the predetermined frequency with a portion of the received signal to generate a combined signal; and computing a position or speed of the radio frequency device based at least in part on a characteristic parameter of the combined signal; wherein the characteristic parameter, based on which the position or speed of the radio frequency device is computed, is based on a time duration of a number of characteristic points in the combined signal. - View Dependent Claims (17, 18, 19, 20)
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Specification