The natural ground decay detection device and its method of presentation

摘要

PROBLEM TO BE SOLVED: To provide a natural ground collapse detecting device and its display method that can correctly receive reflected wave from the natural ground and clearly display the shape of the natural ground. ;SOLUTION: The waveform of direct wave is previously stored, and the stored direct waveform is compared with the waveform of received wave, received by an antenna, so as to specify received direct wave and reflected wave 23 from the natural ground. The positions of the specified received direct wave and reflected wave 23 are displayed in a survey image. At this time, at least the position (the natural ground) corresponding to at least reflected wave receive time and the position (corresponding to the peripheral surface of an excavator) corresponding to the direct wave receive time are displayed discriminatingly from the display of the positions corresponding to other received wave receive time.;COPYRIGHT: (C)1997,JPO