Radio arrival direction estimation device and radio arrival direction estimation method
First Claim
1. A radio arrival direction estimating apparatus comprising:
- an ultra wide band antenna that receives a signal transmitted from a tag;
a tag identification detecting section that detects a tag identification from the signal received by the ultra wide band antenna;
a timing detecting section that associates and detects a timing the tag identification is detected and a sample timing of an identification bit sequence of the tag identification;
an array antenna that is formed with a plurality of antenna elements that receive the signal transmitted from the tag;
a calculating section that calculates relative amplitude phase information to indicate a relative amplitude and phase difference between the plurality of antennas, from the signal received by the array antenna; and
an arrival direction estimating section that estimates an arrival direction of the signal transmitted from the tag, using a timing associated with the sample timing of the identification bit sequence and the relative amplitude phase information.
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Accused Products
Abstract
A radio arrival direction estimation device that accurately estimates the arrival direction of radio waves from a desired tag, even when there are multiple antennas disposed at short intervals. When ID detection timing is provided from a timing detector (114) to a switch (201), relative amplitude/phase data related to the tag ID digital value “1” or “0” is obtained by an arrival direction estimation unit (125). One relative amplitude/phase datum is formed for each unit cycle in a first adder (202), which adds the relative amplitude/phase datum related to the tag ID digital value “1” to each element in a matrix, and a second adder (203), which adds the relative amplitude/phase datum related to the tag ID digital value “0” to each element in a matrix. An OOK signal causes an arithmetic unit (204) to subtract the relative amplitude/phase data produced by the second adder (203) from the relative amplitude/phase data produced by the first adder (202), and extract the phase of a signal corresponding to the phase of the digital value “1.”
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Citations
9 Claims
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1. A radio arrival direction estimating apparatus comprising:
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an ultra wide band antenna that receives a signal transmitted from a tag; a tag identification detecting section that detects a tag identification from the signal received by the ultra wide band antenna; a timing detecting section that associates and detects a timing the tag identification is detected and a sample timing of an identification bit sequence of the tag identification; an array antenna that is formed with a plurality of antenna elements that receive the signal transmitted from the tag; a calculating section that calculates relative amplitude phase information to indicate a relative amplitude and phase difference between the plurality of antennas, from the signal received by the array antenna; and an arrival direction estimating section that estimates an arrival direction of the signal transmitted from the tag, using a timing associated with the sample timing of the identification bit sequence and the relative amplitude phase information. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A radio arrival direction estimating method comprising:
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a tag identification detecting step of detecting a tag identification from a signal which is transmitted from a tag and received by an ultra wide band antenna; a timing detecting step of associating and detecting a timing the tag identification is detected and a sample timing of an identification bit sequence of the tag identification; a calculating step of calculating relative amplitude phase information to indicate a relative amplitude and phase difference between the plurality of antennas, from the signal which is transmitted from the tag and received by an array antenna formed with a plurality of antenna elements; and an arrival direction estimating step of estimating an arrival direction of the signal transmitted from the tag, using a timing associated with the sample timing of the identification bit sequence and the relative amplitude phase information.
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Specification