Anti-jamming detector for radio frequency identification systems
First Claim
1. A radio frequency identification (RFID) reader, comprising:
- a receiver for detecting and receiving signals emitted from one or more RFID devices;
a signal strength detector for determining strength of a detected signal within a prescribed frequency range typical of frequency ranges used by the RFID device and generating a signal strength detection signal indicating the signal strength; and
a processor for receiving the signal strength detection signal and determining whether the signal strength detection signal is indicative of detection of a signal strength above a prescribed maximum established to detect jamming signals, the processor being operative to identify a detected signal as a jamming signal if the signal strength detection signal indicates a signal strength above the prescribed maximum, the processor being further operative to select an appropriate response to the jamming signal from a plurality of available responses.
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Accused Products
Abstract
Systems and techniques for identifying the presence of a jamming signal impairing the operation of an RFID reader. An RFID reader includes a signal strength detector that detects and measures the signal strength of signals within a prescribed frequency range typical of that used by RFID devices. If a signal within the frequency range and exceeding a predetermined maximum strength is detected, the reader identifies the presence of a jamming signal impairing the proper operation of the reader. The reader takes appropriate action upon identification of a jamming signal, for example issuing a local alert or alarm, or sending a message to a central security station, which may then take appropriate action in response to the message, such as alerting appropriate personnel, sounding alarms or securing exits.
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Citations
18 Claims
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1. A radio frequency identification (RFID) reader, comprising:
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a receiver for detecting and receiving signals emitted from one or more RFID devices; a signal strength detector for determining strength of a detected signal within a prescribed frequency range typical of frequency ranges used by the RFID device and generating a signal strength detection signal indicating the signal strength; and a processor for receiving the signal strength detection signal and determining whether the signal strength detection signal is indicative of detection of a signal strength above a prescribed maximum established to detect jamming signals, the processor being operative to identify a detected signal as a jamming signal if the signal strength detection signal indicates a signal strength above the prescribed maximum, the processor being further operative to select an appropriate response to the jamming signal from a plurality of available responses. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A system for management and tracking of goods comprising:
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a plurality of radio frequency identification (RFID) devices, each of the devices being operative to emit an RFID signal including product identification information for an associated product and device identification information specifically identifying the device; a plurality of RFID readers operative to detect signals received from RFID devices, each of the readers being further operative to measure a signal strength of a signal within a predetermined frequency range typical of that within which the RFID devices operation and to identify a signal as a jamming signal interfering with proper operation of the reader if the signal exceeds a predetermined maximum signal strength, each reader being operative to select an appropriate response to identification of a signal as a jamming signal, the response being one of a plurality of available responses. - View Dependent Claims (8, 9, 10, 11, 12)
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13. A method of management and tracking of goods identified by radio frequency identification (RFID) devices, comprising:
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communicating with a plurality of RFID devices in order to receive information from the devices; measuring the strength of each received signal within a prescribed frequency range typical of the range used by the RFID devices; if a received signal within the prescribed frequency range exceeds a predetermined maximum established to detect jamming signals, identifying the presence of a jamming signal; and selecting an appropriate response to the identification of the jamming signal, the response being selected from a plurality of available responses. - View Dependent Claims (14, 15, 16, 17, 18)
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Specification