Tag communication apparatus, control method for tag communication apparatus, computer readable medium for tag communication control and tag communication control system
First Claim
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1. An apparatus configured to communicate with an RFID (Radio Frequency Identification) tag through a radio wave, said apparatus comprising:
- a plurality of antenna elements, each of which is configured to receive the radio wave from the RFID tag;
a direction estimating section configured to estimate an incoming direction of the radio wave from the RFID tag at each of the antenna elements thereby obtaining estimated directions;
a power measuring section configured to measure a power of the radio wave received by each of the antenna elements, thereby obtaining a measured power ratio;
a position calculating section configured to calculate a position of the RFID tag based on the estimated directions; and
a power ratio estimating section configured to estimate a ratio of powers to be received by the antenna elements based on the calculated position of the RFID tag, as an estimated power ratio;
wherein the position calculating section is configured to compare the measured power ratio with the estimated power ratio to verify the calculated position of the RFID tag.
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Abstract
A direction estimating section estimates the incoming direction of a radio wave from an RFID tag in each of antennas. A position calculating section calculates the position of the RFID tag on the basis of the incoming direction of the radio wave estimated in the direction estimating section.
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Citations
9 Claims
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1. An apparatus configured to communicate with an RFID (Radio Frequency Identification) tag through a radio wave, said apparatus comprising:
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a plurality of antenna elements, each of which is configured to receive the radio wave from the RFID tag; a direction estimating section configured to estimate an incoming direction of the radio wave from the RFID tag at each of the antenna elements thereby obtaining estimated directions; a power measuring section configured to measure a power of the radio wave received by each of the antenna elements, thereby obtaining a measured power ratio; a position calculating section configured to calculate a position of the RFID tag based on the estimated directions; and a power ratio estimating section configured to estimate a ratio of powers to be received by the antenna elements based on the calculated position of the RFID tag, as an estimated power ratio; wherein the position calculating section is configured to compare the measured power ratio with the estimated power ratio to verify the calculated position of the RFID tag. - View Dependent Claims (2)
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3. A method for controlling an apparatus comprising a plurality of antenna elements each of which receives a radio wave from an RFID (Radio Frequency Identification) tag to communicate with the RFID tag, said method comprising:
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estimating an incoming direction of the radio wave from the RFID tag at each of the antenna elements, thereby obtaining estimated directions; measuring a power of the radio wave received by each of the antenna elements, thereby obtaining a measured power ratio ; calculating a position of the RFID tag based on the estimated directions; estimating a ratio of powers to be received by the antenna elements based on the calculated position of the RFID tag, as an estimated power ratio; and
comparing the measured power ratio with the estimated power ratio to verify the calculated position of the RFID tag. - View Dependent Claims (4)
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5. A computer readable medium comprising a program including instructions for controlling an apparatus comprising a plurality of antenna elements each of which is configured to receive a radio wave from an RFID (Radio Frequency Identification) tag to communicate with the RFID tag, said instructions comprising:
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estimating an incoming direction of the radio wave from the RFID tag at each of the antenna elements, thereby obtaining estimated directions; measuring a power of the radio wave received by each of the antenna elements, thereby obtaining a measured power ratio; calculating a position of the RFID tag based on the estimated directions; estimating a ratio of powers to be received by the antenna elements based on the calculated position of the RFID tag, as an estimated power ratio; and comparing the measured power ratio with the estimated power ratio to verify the calculated position of the RFID tag. - View Dependent Claims (6)
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7. A tag communication control system comprising:
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an apparatus configured to communicate with an RFID (Radio Frequency Identification) tag through a radio wave, said apparatus including; a plurality of antenna elements each of which is configured to receive the radio wave from the RFID tag; a direction estimating section configured to estimate an incoming direction of the radio wave from the RFID tag at each of the antenna elements thereby obtaining estimated directions; a power measuring section configured to measure a power of the radio wave received by each of the antenna elements, thereby obtaining a measured power ratio; a position calculating section configured to calculate a position of the RFID tag based on the estimated directions; and a power ratio estimating section configured to estimate a ratio of powers to be received by the antenna elements based on the calculated position of the REID tag, as an estimated power ratio; a management section for managing at least one object correlated with the RFID tag based on a result obtained from the communication with the RFID tag by the apparatus; wherein the position calculating section is configured to compare the measured power ratio with the estimated power ratio to verify the calculated position of the RFID tag. - View Dependent Claims (8, 9)
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Specification