发明名称 |
Distance measuring apparatus, distance measuring method, reflector, and communication system |
摘要 |
A transmission controller 7B is configured to transmit an R/W request signal for requesting transmission of a tag response signal to a RFID tag 1 twice. At this time, a frequency controller 7A controls a PLL section 5A to transmit the R/W request signal via different carrier frequencies. A phase information acquirer 8A detects a phase change amount of the tag response signal that is transmitted via different carrier frequencies. A distance calculator 8B calculates the distance between the reader/writer 2 and the RFID tag 1 on the basis of the phase change amount.
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申请公布号 |
US7903022(B2) |
申请公布日期 |
2011.03.08 |
申请号 |
US20090628620 |
申请日期 |
2009.12.01 |
申请人 |
OMRON CORPORATION |
发明人 |
OHARA HIDEYUKI;KAWAI TAKEHIRO;SAITO KEISUKE;HAYAMA KOSUKE |
分类号 |
G01S3/08 |
主分类号 |
G01S3/08 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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