| 摘要 |
PURPOSE: A power line route exploration technique and apparatus with improved signal reception in a noise region are provided to improve the accuracy of route exploration and minimize a surrounding influence on the route exploration. CONSTITUTION: A magnetic field sensor detects a current signal for exploration flowing through power lines. A filter unit removes a power frequency and a multiple component signal from signals inputted to a sensor. An analog-to-digital converter (ADC) digitizes signals passing through the filter unit. A time controller checks a combination of a logical value 0 received at a next power frequency time and an initial logical value 1 and among signals passing through the ADC to determine a noise and exploration signal. A signal display unit displays the exploration signal size value of the logical value 1 received at the next power frequency time on the basis of an exploration signal detected by the time controller. [Reference numerals] (AA) Ferrite coil (magnetic field sensor); (BB) 600 Hz band filter; (CC) Wave form measurement point |
