| 摘要 |
PROBLEM TO BE SOLVED: To overcome a problem that determination of a passing order of a gate becomes difficult when a plurality of radio ID tags approach.SOLUTION: The radio ID tag system includes, with respect to each gate, a means for emitting an inquiry signal when the radio ID tag 34 enters within the gate; a means for obtaining ID information upon receiving a response signal from the radio ID tag relative to the inquiry signal; and a means for obtaining receiving electric power of the response signal. Further, the system includes a means for determining the unnecessary radio tag by a change with time of the receiving electric power; a means for performing filtering that the ID information of the unnecessary radio ID tag is deleted from the ID information of the received radio ID tag; and a means for determining the order of the radio ID tags passed through the gate in every gate by a change with the time of a receiving signal intensity value relative to the plurality of radio ID tags passed through the gate in every gate. |
