| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a distance measuring device for an IC tag that enhances accuracy of distance measurement, and the IC tag. <P>SOLUTION: A distance measuring device comprises: an electric wave receiver 22 that receives at an antenna 14 a first composite reflected wave formed of a first reflected wave generated by a target IC tag 18 reflecting a distance measuring electric wave at a first reflection coefficient and a second reflected wave generated by another IC tag 20 reflecting the distance measuring electric wave to generate a first received signal, and receives at the antenna a second composite reflected wave formed of a third reflected wave generated by the target IC tag reflecting the distance measuring electric wave at a second reflection coefficient different from the first reflection coefficient and a forth reflected wave generated by the other IC tag reflecting the distance measuring electric wave to generate a second received signal; and a phase difference calculator 8 that determines a phase difference between a signal component corresponding to the first reflected wave in the first received signal and the transmitted signal based on the first received signal and the second received signal. <P>COPYRIGHT: (C)2012,JPO&INPIT</p> |
