Enhanced RFID Output Control
OwnerDirk Lorenzinventor
Life of this patent
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Abstract
A method, system, and an apparatus are provided for enhanced RFID system output control. A carrier field of an RFID reader is switched on in a controlled manner. A response signal from a passive RFID transponder located in the carrier field is received at the RFID reader. The response signal comprises a code related to the RFID transponder. Said code is detected and a time difference is determined between the switching on of the carrier field and the detection of the code signal. Said time difference provides a measure for the distance between the RFID transponder and the RFID reader.
Claims15
A method of distance determination in an RFID system, the method comprising the steps of.
- switching on a carrier field of an RFID reader;
- receiving, at the RFID reader, a response signal from a passive RFID transponder located in the carrier field, said response signal comprising a code related to the RFID transponder;
- detecting said code;
- and
- determining a time difference between the switching on of the carrier field and the detection of the code signal, said time difference providing a measure for the distance between the RFID transponder and the RFID reader.
An RFID system for distance determination comprising:
- a microcontroller unit, MCU, for providing a carrier enable signal and receiving a data signal;
- a passive RFID transponder having a code, for providing a response signal comprising the code when being located in a carrier field;
- an RFID reader for generating the carrier field in response to the received carrier enable signal, receiving the response signal comprising the code, and providing the data signal to the MCU comprising the code signal representing the code,
- wherein the MCU determines a time of detection of the code from the data signal, and determines a time difference between a switching on of the carrier enable signal and said time of detection.
An apparatus for distance determination in an RFID system, the apparatus comprising:
- means for generating a carrier enable signal;
- means for providing the carrier enable signal to an RFID reader;
- means for receiving a data signal comprising a code signal from the RFID reader, wherein the code signal represents a code of a passive RFID transponder located in a carrier field of the RFID reader;
- means for determining a time of detection of the code from the data signal;
- and
- means for determining a time difference between the time of detection and the preceding switching on of the carrier enable signal, said time difference providing a measure for a distance between the RFID transponder and the RFID reader.
Dependencies are inferred from the claim text.