| 摘要 |
<P>PROBLEM TO BE SOLVED: To eliminate the need of correcting correlation data to a varying factor of a radio wave transmission level of an identification information transmitter when calculating a relative distance between an information processor and the identification information transmitter on the basis of a measurement value of a received radio wave intensity and the correlation data that is acquired in advance. <P>SOLUTION: A digital multifunction machine 2 transmits a radio wave and stores a transmission electric field strength. When a user Y approaches the digital multifunction machine 2, the identification information transmitter 4 carried by the user Y receives the radio wave from the digital multifunction machine 2, measures the electric field strength of the radio wave, and transmits the measured data with the identification information of the user Y to the digital multifunction machine 2. The digital multifunction machine 2 calculates a relative distance between the digital multifunction machine 2 and the identification information transmitter 4 on the basis of the stored transmission electric field strength, the received electric field strength acquired from the identification information transmitter 4, and the correlation data that is created in advance and stored. <P>COPYRIGHT: (C)2010,JPO&INPIT |
