JP5121048B2 - Rfidタグからの無線周波数識別方法及び無線周波数識別装置 - Google Patents
Rfidタグからの無線周波数識別方法及び無線周波数識別装置 Download PDFInfo
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- JP5121048B2 JP5121048B2 JP2007289526A JP2007289526A JP5121048B2 JP 5121048 B2 JP5121048 B2 JP 5121048B2 JP 2007289526 A JP2007289526 A JP 2007289526A JP 2007289526 A JP2007289526 A JP 2007289526A JP 5121048 B2 JP5121048 B2 JP 5121048B2
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- 238000000034 method Methods 0.000 title claims description 22
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- 238000005259 measurement Methods 0.000 claims description 11
- 238000010183 spectrum analysis Methods 0.000 claims description 8
- 238000004891 communication Methods 0.000 claims description 7
- 238000007619 statistical method Methods 0.000 claims description 6
- 238000012545 processing Methods 0.000 claims description 3
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
- G06K7/0008—General problems related to the reading of electronic memory record carriers, independent of its reading method, e.g. power transfer
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/20—Monitoring; Testing of receivers
- H04B17/26—Monitoring; Testing of receivers using historical data, averaging values or statistics
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/30—Monitoring; Testing of propagation channels
- H04B17/309—Measuring or estimating channel quality parameters
- H04B17/318—Received signal strength
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/30—Monitoring; Testing of propagation channels
- H04B17/309—Measuring or estimating channel quality parameters
- H04B17/345—Interference values
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Description
Claims (8)
- RFIDタグから発信された無線周波数を受信しこれを識別するRFID装置における無線周波数の識別方法であって、
前記RFID装置が、
1又は複数の無線周波数チャンネルを有する無線周波数チャネルで無線周波数の質問信号を送信するステップと、
前記無線周波数チャネルで周囲雑音を含む無線周波数信号を受信するステップと、
前記受信した無線周波数信号のスペクトル解析を行うことにより当該無線周波数信号の大きさを測定するステップと、
統計的解析に基づいて前記無線周波数チャネルに関連する無線周波数信号を識別するための判定閾値を設定するステップと、
前記測定結果と前記所定の判定閾値とを比較するステップと、
の各ステップを含み、
前記測定結果が前記判定閾値よりも大きい場合には、前記質問信号に対する複数のRFIDからの応答が衝突したものとみなして前記測定結果が前記判定閾値よりも小さくなるまで前記無線周波数チャンネル数を順次大きくして前記無線周波数の質問信号を送信することを特徴とする無線周波数識別方法。 - 前記スペクトル解析が前記受信信号のフーリエ解析を含む、請求項1に記載の無線周波数識別方法。
- 前記測定結果が、前記無線周波数チャネルに割り当てられた循環バッファ内に格納される、請求項1に記載の無線周波数識別方法。
- 前記統計的解析が、前記循環バッファ内に格納しているデータにガウス分布モデルを使用するステップを含む、請求項3に記載の無線周波数識別方法。
- RFIDタグに対して1又は複数の無線周波数チャネルで無線周波数信号の質問信号を送信する無線周波数送信機と、
前記無線周波数チャネルで周囲雑音を含む無線周波数信号を受信する無線周波数受信機と、
前記受信機および前記送信機と通信接続している処理ユニットと、
前記処理ユニットからの命令に基づいて、
(a)前記送信機が、前記無線周波数チャネルで周囲雑音を含む無線周波数信号を受信し、
(b)前記受信機が受信した前記無線周波数信号のスペクトル解析を行うことにより当該無線周波数信号の大きさを測定し、
(c)統計的解析に基づいて、前記無線周波数チャネルに関連する無線周波数信号を識別するための判定閾値を設定し、
(d)前記測定結果と前記所定の判定閾値とを比較し、
(e)前記測定結果が前記判定閾値よりも大きい場合には、前記質問信号に対する複数のRFIDからの応答が衝突したものとみなして前記測定結果が前記判定閾値よりも小さくなるまで前記無線周波数チャンネル数を順次大きくして前記無線周波数の質問信号を送信する、プログラムを格納するメモリ・ユニットと、
を備えた無線周波数識別装置。 - 前記スペクトル解析が前記受信信号のフーリエ解析を含む、請求項5に記載の無線周波数識別装置。
- 前記測定結果が、前記無線周波数チャネルに割り当てられた循環バッファ内に格納される、請求項5に記載の無線周波数識別装置。
- 前記統計的解析が、前記循環バッファ内に格納しているデータにガウス分布モデルを使用する、請求項7に記載の無線周波数識別装置。
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US11/557,544 US7649441B2 (en) | 2006-11-08 | 2006-11-08 | Method and system for tuning an RFID interrogator |
US11/557,544 | 2006-11-08 |
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JP2008125077A5 JP2008125077A5 (ja) | 2010-12-24 |
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US (1) | US7649441B2 (ja) |
EP (1) | EP1923816B1 (ja) |
JP (1) | JP5121048B2 (ja) |
CN (1) | CN101178765B (ja) |
DE (1) | DE602007009169D1 (ja) |
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CN101178765B (zh) | 2015-02-11 |
US7649441B2 (en) | 2010-01-19 |
DE602007009169D1 (de) | 2010-10-28 |
CN101178765A (zh) | 2008-05-14 |
EP1923816B1 (en) | 2010-09-15 |
US20080106381A1 (en) | 2008-05-08 |
JP2008125077A (ja) | 2008-05-29 |
EP1923816A1 (en) | 2008-05-21 |
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