SEMICONDUCTOR DEVICE AND POSITION DETECTION SYSTEM USING SEMICONDUCTOR DEVICE

摘要

PROBLEM TO BE SOLVED: To perform radio communication to check whether or not there exists an RFID in space; to acquire information such as an ID possessed by the RFID; and to identify the position of the RFID.

SOLUTION: A position detection system is built by connecting a plurality of interrogators to a sever via a network. By performing radio communication between an RFID and the interrogators, the distance from each of the interrogators to the RFID is calculated and the position of the RFID is calculated from the distance. In order to calculate the distance from the interrogator to the RFID, a signal is caused to oscillate in the RFID at a frequency corresponding to the amplitude of a signal received from the interrogator. The distance from the interrogator to the RFID is detected by detecting, in the RFID or with use of the interrogator, the frequency of the signal oscillating in the RFID.

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