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. |
申请公布号 |
EP1863190(B1) |
申请公布日期 |
2016.11.02 |
申请号 |
EP20050781553 |
申请日期 |
2005.09.01 |
申请人 |
OMRON CORPORATION |
发明人 |
OHARA, HIDEYUKI;KAWAI, TAKEHIRO;SAITO, KEISUKE;HAYAMA, KOSUKE |
分类号 |
H04B5/02;G01S13/38;G01S13/74;G01S13/84;G06K17/00;H04B1/59;H04B17/00 |
主分类号 |
H04B5/02 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|