The electromagnetic signal is generated by the transmitter and transmitted to the underground tested cable through different transmission connection methods. After the underground cable senses the electromagnetic signal, an induced current is generated on the cable, and the induced current propagates along the cable towards the distance. During the propagation of the current, electromagnetic waves are radiated to the ground through the underground cable. This way, when the pipeline locator receiver detects on the ground, The electromagnetic wave signal will be received on the ground above the cable, and the position, direction, and fault of the underground cable will be determined by the changes in the strength of the received signal.
