As a key channel for power transmission

power transmission lines are erected in open areas through poles

which are extremely vulnerable to lightning and affect the safety and stability of power systems. At the same time

as a lightning protection method for line towers

grounding materials are buried underground all year round

making it difficult to detect their defects. Consequently

we investigated the imaging characteristics of pulsed ground penetrating radar on the basis of traditional ground penetrating radar detection methods

and proposed a ground renetrating radar（GPR） imaging processing method for detecting faults in the grounding tower of line poles. The Stolt migration method was used to image the radar detection echo

and the radar offset image was processed with the image binarization and expansion and corrosion algorithm. The Canny operator was used to carry out the pole fault identification and diagnosis. The simulation and sand pool experiment results show that the proposed grounding body defect detection technology can be employed to accurately identify whether the grounding body is broken or damaged without digging or power failure

which is helpful for the actual line lightning detection work.