Interrogator and Interrogation System Employing the Same
First Claim
1. A control and processing system, comprising:
- a correlation subsystem configured to correlate a reference code with a reply code from a radio frequency identification (RFID) object and provide a correlation signal therefrom, said correlation signal including a narrow-band area having a narrow-band signal to noise ratio (SNR) value and a wide-band area having a wide-band SNR value; and
a decision subsystem configured to verify a presence of said RFID object as a function of said correlation signal wherein a probability of a match between said reference code and said reply code increases with a greater difference between said narrow-band SNR value and said wide-band SNR value.
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Accused Products
Abstract
An interrogator, methods of discerning the presence of an object, and interrogation systems employing the same. In one embodiment, the interrogation systems include multiple interrogators that communicate with a base command unit to track a location of an object. In another embodiment wherein the object is an RFID object (e.g., an object with an RFID tag), the interrogators employ signal processing techniques such as precharging the RFID object, and correlating a reference code with a reply code from the RIFD object using selected techniques to increase a sensitivity of the interrogator, especially for adverse environments. In other embodiments, the interrogation systems include variations of metal instruments and sponges employed therewith. In yet another embodiment, the interrogation system includes metal interrogators capable of discerning the presence of a metal object, especially in a presence of another metal object.
215 Citations
30 Claims
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1. A control and processing system, comprising:
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a correlation subsystem configured to correlate a reference code with a reply code from a radio frequency identification (RFID) object and provide a correlation signal therefrom, said correlation signal including a narrow-band area having a narrow-band signal to noise ratio (SNR) value and a wide-band area having a wide-band SNR value; and
a decision subsystem configured to verify a presence of said RFID object as a function of said correlation signal wherein a probability of a match between said reference code and said reply code increases with a greater difference between said narrow-band SNR value and said wide-band SNR value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A method of verifying a presence of a radio frequency identification (RFID) object, comprising:
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correlating a reference code with a reply code from an RFID object and providing a correlation signal therefrom, said correlation signal including a narrow-band area having a narrow-band signal to noise ratio (SNR) value and a wide-band area having a wide-band SNR value; and
verifying a presence of said RFID object as a function of said correlation signal wherein a probability of a match between said reference code and said reply code increases with a greater difference between said narrow-band SNR value and said wide-band SNR value. - View Dependent Claims (16, 17, 18, 19, 20)
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21. An interrogation system, comprising:
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a radio frequency identification (RFID) object; and
an interrogator, including;
a correlation subsystem configured to correlate a reference code with a reply code from an RFID object and provide a correlation signal therefrom, said correlation signal including a narrow-band area having a narrow-band signal to noise ratio (SNR) value and a wide-band area having a wide-band SNR value, and a decision subsystem configured to verify a presence of said RFID object as a function of said correlation signal wherein a probability of a match between said reference code and said reply code increases with a greater difference between said narrow-band SNR value and said wide-band SNR value. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28, 29, 30)
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Specification