Data reader and positioning system
DCFirst Claim
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1. A positioning system, comprising:
- a plurality of antenna units mounted in different places to read data from storage mediums each having a storage unit for storing data and a communicating antenna for transmission of the data stored in the storage unit, by using radio waves having different polarization directions;
a control unit connected to each antenna unit, for controlling each antenna unit to sequentially change radiation characteristics of each antenna unit;
an antenna switch unit for selectively driving the antenna units in accordance with a control instruction from the control unit to transmit the radio wave having desired polarization directions according to each antenna unit by switching the antenna units; and
a positioning unit for calculating the position of each storage medium on the basis of strengths of signals, the strengths of the signals being obtained as a result of read operations of the data stored in the storage mediums, by using radio waves having different polarization directions, while having each antenna unit sequentially change its radiation characteristics.
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Abstract
A data reader can read data regardless of the position of a radio IC tag. The data reader reads data at a separate position from a radio IC tag provided with a storage unit storing data and a communicating antenna for transmitting the data stored in the storage unit, and includes a reader/writer for generating a modulated signal by modulating a carrier wave and a plurality of antenna units for transmitting radio waves for a read for communicating data with a storage medium by radiating the modulated signal into the air. The reader/writer includes a phase adjustment circuit for changing the phase of a carrier wave.
8 Citations
13 Claims
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1. A positioning system, comprising:
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a plurality of antenna units mounted in different places to read data from storage mediums each having a storage unit for storing data and a communicating antenna for transmission of the data stored in the storage unit, by using radio waves having different polarization directions; a control unit connected to each antenna unit, for controlling each antenna unit to sequentially change radiation characteristics of each antenna unit; an antenna switch unit for selectively driving the antenna units in accordance with a control instruction from the control unit to transmit the radio wave having desired polarization directions according to each antenna unit by switching the antenna units; and a positioning unit for calculating the position of each storage medium on the basis of strengths of signals, the strengths of the signals being obtained as a result of read operations of the data stored in the storage mediums, by using radio waves having different polarization directions, while having each antenna unit sequentially change its radiation characteristics. - View Dependent Claims (2, 3)
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4. A positioning system, comprising:
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a plurality of antenna units mounted in different places to read data from storage mediums each having a storage unit for storing data, and a communicating antenna for transmission of the data stored in the storage unit, by using radio waves having different center frequencies; a control unit connected to each antenna unit, for controlling each antenna unit to sequentially change radiation characteristics of each antenna unit; an antenna switch unit for selectively driving the antenna units in accordance with a control instruction from the control unit to transmit the radio wave having desired polarization directions according to each antenna unit by switching the antenna units; and a positioning unit for calculating the position of each storage medium on the basis of strengths of signals, the strengths of the signals being obtained as a result of read operations of the data of the storage mediums, by using radio waves having different central frequencies, while having each antenna unit sequentially change its radiation characteristics. - View Dependent Claims (5, 6)
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7. A positioning system, comprising:
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a plurality of antenna units mounted in different places to read data from storage mediums each having a storage unit for storing data and a communicating antenna for transmission of the data stored in the storage unit, by using radio waves having different polarization directions and center frequencies; a control unit connected to each antenna unit, for controlling each antenna unit to sequentially change radiation characteristics of each antenna unit; an antenna switch unit for selectively driving the antenna units in accordance with a control instruction from the control unit to transmit the radio wave having desired polarization directions according to each antenna unit by switching the antenna units; and a positioning unit for calculating the position of each storage medium on the basis of strengths of signals, the strengths of the signals being obtained as a result of read operations of the data stored in the storage mediums by using radio waves having different polarization directions and different central frequencies, while having each antenna unit sequentially change its radiation characteristics. - View Dependent Claims (8, 9)
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10. A positioning system, comprising:
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a plurality of antenna units mounted in different places to read data from storage mediums each having a storage unit for storing data and a communicating antenna for transmission of the data stored in the storage unit; a control unit connected to each antenna unit, for controlling each antenna unit to sequentially change radiation characteristics of each antenna unit; an antenna switch unit for selectively driving the antenna units in accordance with a control instruction from the control unit to transmit the radio wave having desired polarization directions according to each antenna unit by switching the antenna units; and a positioning unit for calculating the position of each storage medium by using the number of succeeded read operations which is obtained by having each antenna unit read the storage mediums, while having each antenna unit sequentially change its radiation characteristics. - View Dependent Claims (11, 12, 13)
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Specification