RFID verifier system with grade classification
First Claim
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1. An RFID verifier, comprising:
- a transceiver operable to interrogate with an interrogating signal an RFID tag and to receive a resulting backscattered signal from the interrogated RFID tag;
a transmit signal strength indicator operable to measure the interrogating signal power;
a received signal strength indicator operable to measure the signal power from the interrogated RFID tag; and
a processor operable to compare the measured interrogating signal power and RFID tag signal power to obtain an measure of quality for the interrogated RFID tag, the processor being configured to classify the measure of quality with reference to a predetermined absolute measure of quality.
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Abstract
An RFID verifier includes a transmit signal strength indicator (TSSI) and a receive signal strength indicator (RSSI). Using the TSSI, the RFID verifier may determine the amount of power an interrogated RFID tag is illuminated with. Similarly, using the RSSI, the RFID verifier may determine the amount of power returned to the RFID verifier by the RFID tag. By processing the returned power and the illuminating power with a transfer function, the RFID verifier may provide an absolute indicia of quality for the interrogated RFID tag.
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Citations
20 Claims
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1. An RFID verifier, comprising:
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a transceiver operable to interrogate with an interrogating signal an RFID tag and to receive a resulting backscattered signal from the interrogated RFID tag;
a transmit signal strength indicator operable to measure the interrogating signal power;
a received signal strength indicator operable to measure the signal power from the interrogated RFID tag; and
a processor operable to compare the measured interrogating signal power and RFID tag signal power to obtain an measure of quality for the interrogated RFID tag, the processor being configured to classify the measure of quality with reference to a predetermined absolute measure of quality. - View Dependent Claims (2, 3, 4, 5, 6)
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7. An RFID tag verification method, comprising:
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determining an optimal location from which an absolute measure of quality may be measured from a first RFID tag;
from a second location;
determining a measure of quality for the first RFID tag to establish a transfer function between the measure of quality at the second location and the absolute measure of quality from the optimal location;
interrogating a second RFID tag with a first interrogating RFID signal;
measuring the power of the interrogating RF signal;
receiving a modulated RF signal from a second interrogated RFID tag;
measuring the power of the received modulated RF signal from the second interrogated RFID tag; and
processing the measured powers from the interrogated second RFID tag with the transfer function to provide an absolute measure of quality for the interrogated second RFID tag. - View Dependent Claims (8, 9, 10, 11, 12, 13)
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14. A system, comprising:
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a bar code label printer; and
an RFID verifier including;
a transceiver operable to interrogate with an interrogating signal an RFID tag and to receive a resulting backscattered signal from the interrogated RFID tag;
a transmit signal strength indicator operable to measure the interrogating signal power;
a received signal strength indicator operable to measure the signal power from the interrogated RFID tag; and
a processor operable to compare the measured interrogating signal power and RFID tag signal power to obtain an measure of quality for the interrogated RFID tag, the processor being configured to classify the measure of quality with reference to a predetermined absolute measure of quality, wherein the interrogated RFID tag is associated with an article, the system being configured to apply a bar code label from the printer to the article if the measure of quality is classified into an acceptable grade of quality. - View Dependent Claims (15, 16, 17)
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18. An RFID tag verification method, comprising:
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determining an optimal location from which an absolute measure of quality may be measured from a first RFID tag;
from a second location;
determining a measure of quality for the first RFID tag to establish a transfer function between the measure of quality at the second location and the absolute measure of quality from the optimal location;
interrogating a second RFID tag with a first interrogating RFID signal;
measuring the power of the interrogating RF signal;
receiving a modulated RF signal from a second interrogated RFID tag;
measuring the power of the received modulated RF signal from the second interrogated RFID tag; and
processing the measured powers from the interrogated second RFID tag with the transfer function to identify an antenna type implemented in the second RFID tag.
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19. An RFID tag classification method, comprising:
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providing a plurality of expected antenna beam intensity patterns, each expected antenna beam intensity pattern corresponding to a particular type of antenna;
interrogating an RFID tag from a plurality of directions;
measuring the power of a received modulated RF signal from the interrogated RFID tag to form a measured antenna beam intensity pattern; and
comparing the measured antenna beam intensity pattern from the plurality of expected antenna beam intensity patterns to classify the interrogated RFID tag according to antenna type.
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20. An RFID reader, comprising:
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a transceiver operable to interrogate with an interrogating signal an RFID tag and to receive a resulting signal from the interrogated RFID tag;
a received signal strength indicator operable to measure the signal power from the interrogated RFID tag; and
a processor operable to process the measured signal power to form a measured antenna beam intensity pattern for the interrogated RFID tag, the processor being configured to compare the measured antenna beam intensity pattern with a plurality of expected antenna beam intensity patterns, wherein each expected antenna beam intensity pattern corresponds to a particular type of antenna, and based upon the comparison to classify the interrogated RFID tag according to an antenna type.
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Specification