| 摘要 |
PROBLEM TO BE SOLVED: To provide a marker surveying device that can measure the burial depth of a marker and minimizes the displacement of the measured value from the actual burial position of the marker.SOLUTION: A response signal from a marker 61 is digitized, then a previously prepared data table is referred to, the depth D corresponding to a received value corresponding to the intensity of the response signal is extracted, and the burial depth of the marker is measured. The transmission of a transmitted signal and the reception of the response signal are alternately repeated a plurality of times, the received response signals are digitized, and a received value is calculated from n acquired received signals. On the basis of the last received value at a certain point acquired by digital signal processing, the previously received value at the point prior to the certain point, and a display value, a predicted value is calculated and displayed on a display device. |
