| 摘要 |
<p>PURPOSE:To improve the operating efficiency of probing, and to reduce power consumption. CONSTITUTION:A marker 1 with a marker antenna 11 and a resonator 12, a transmitting section 21, a receiving section 22, an antenna 23 for scanning, a transmission-reception changeover section 24 and a changeover control section 26 are mounted. The antenna 23 for scanning is composed of a first antenna parallel with the marker antenna 11 and a second antenna approximately orthogonal to the first antenna. An antenna changeover section 25 changing over the first antenna and the second antenna as to whether the first antenna or the second antenna is connected to the transmission-reception changeover section 24 side is installed. The changeover control section 26 is constituted so as to change over the antenna changeover section 25 for a set period. The receiving section 22 specifies a place, where a reception level at a time when the first antenna is connected exceeds a first threshold and a reception level at a time when the second antenna is connected reaches a second threshold or lower, as a buried place.</p> |
