抄録
A cellphone has been put at our bedside and used as an alarm clock frequently. When an earthquake occurred, it is easy to find a sufferer to detect the buried position of a cellphone. So, the sufferer detection system with a cellphone which is consists of two components has been developed. One component is a distance measurement system (DSMS) which measures the distance to make use of the difference of propagation velocity between an electric wave and a sound wave. The other component is a direction measurement system (DRMS) which measures the direction to utlize the radio field intensity. This paper is described about the principle of DRMS and the results of cellphone detection experiment.
