| 摘要 |
Several readers are disposed in different positions within a region for receiving a tag ID code of a radio frequency identification (RFID) tag. The RFID tag has a power supply and a lock circuit, and the lock circuit switches the power supply. When one of the readers receives the tag ID code, the tag ID code is compared to an assigned ID code. If the tag ID code is the same as the assigned ID code, the power supply is enabled to provide electrical power for repeatedly sending the tag ID code. Then, the position of the RFID tag is identified by the readers which receive the tag ID code.
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