DATA CARRIER SYSTEM WITH TRESPASSER DETECTING FUNCTION

摘要

PROBLEM TO BE SOLVED: To provide a system which can securely detect an entering person when the entering person is an illegal trespasser for the entry/exiting management of security managed facilities using a data carrier system. SOLUTION: This system is equipped with a 1st communication means which comprises a transponder means that a person to be detected carries and an interrogator means which communicates with a host computer and wakes up when the transponder means approaches the interrogator means to communicate with the interrogator means by mirowaves and a 2nd communication means which detects the person to be detected entering with the Doppler reflected wave of the microwave, sent from the transponder means, from the person to be detected; and it is judged that the entering person to be detected is an illegal trespasser when the 1st communication means makes no response and the Doppler signal of the 2nd communication means exceeds a specific level.