| 摘要 |
<P>PROBLEM TO BE SOLVED: To attain a position information detecting system with high precision when an obstruction and a reflective object exist between a reader/writer and an RF chip. <P>SOLUTION: The position information detecting system includes a reader/writer whose physical position is known, a first RF chip whose physical position is known, and a second RF chip attached to an object to be detected of physical position information. The position information detecting system calculates the physical distance, between the reader/writer and the second RF chip from a first calculated distance between the reader/writer and the first RF chip, which is calculated from the signal intensity of a communication signal transmitted from the reader/writer and detected by the first RF chip; a second calculated distance between the second RF chip and the reader/writer, which is calculated from the signal intensity of a communication signal transmitted from the reader/writer and detected by the second RF chip, and the physical distance between the reader/writer and the first RF chip. <P>COPYRIGHT: (C)2008,JPO&INPIT |
