发明授权
- 专利标题： Distance measuring apparatus, distance measuring method, reflector and communication system
- 专利标题（中）： 距离测量仪器，测距方法，反射器和通讯系统
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申请号： US11885973申请日： 2005-09-01
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公开(公告)号： US07649491B2公开(公告)日： 2010-01-19
- 发明人: Hideyuki Ohara , Takehiro Kawai , Keisuke Saito , Kosuke Hayama
- 申请人： Hideyuki Ohara , Takehiro Kawai , Keisuke Saito , Kosuke Hayama
- 申请人地址： JP Kyoto
- 专利权人： Omron Corporation
- 当前专利权人： Omron Corporation
- 当前专利权人地址： JP Kyoto
- 代理机构： Dickstein Shapiro LLP
- 优先权： JP2005-066298 20050309
- 国际申请： PCT/JP2005/016005 WO 20050901
- 国际公布： WO2006/095463 WO 20060914
- 主分类号： G01S3/08
- IPC分类号： G01S3/08
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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