| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide an inexpensive and sure data transmission system, in an underground radar device installed on an underground excavating device used for a non-excavation drilling method or the like wherein a metal pipe is formed by connecting metal cylindrical rods, and an underground excavator is mounted on the tip, and a torque and a driving force are transferred to the excavator from the ground through the metal pipe. <P>SOLUTION: This device is equipped in the underground excavator P with underground antennas TX, RX for transmitting a radio wave into the underground and receiving a reflection signal, and a signal transmission part ST for transmitting an electric signal such as the received reflection signal received by the underground antennas to the metal pipe R extending from the back of the underground excavator P to the ground, and connecting a grounding terminal to a grounding point through a signal wire having the proper length. The device is also equipped on the ground with a signal reception part A, D, SP for receiving through a noncontact type electromagnetic coupler C, the electric signal transferred to the ground through the metal pipe R. <P>COPYRIGHT: (C)2005,JPO&NCIPI</p> |
