Abstract: Ultra high voltage (UHV) transmission line corona is one of the main interference sources of Airport Non-direction Radio Beacon. According to the working principle of radio compass, the radio relative azimuth angle deviation measured by airborne radio is given theoretically. The angle deviation is simulated on the condition of different frequency, distance between non-directional radio beacon and transmission line. The study shows that with the interference caused by corona discharge, the radio relative azimuth angle deviation measured by airborne radio increases with the increase of distance and changes steep leveled off with the increase of frequency.

Key words: UHV transmission line, Corona, Non-directional radio beacon, Radio compass, Interference