Abstract: To study the ElectroMagnetic Interference (EMI) effect of the pantograph catenary arc of high-speed railway on aircraft approach landing, this study tests the electromagnetic radiation intensity of the pantograph catenary arc in phase separation where the arc occurs frequently. According to the theory of radio wave propagation and GB 6364-2013 the relation between the received signal in the aircraft and the angle of passing through the airport, the position of the phase separation, and the landing height of the aircraft is obtained by numerical calculations. First, the Signal-to-Interference Ratio (SIR) of airborne received signals increases gradually with the increase of the angle of passing through the airport; then, the closer the phase separation is to the airport runway threshold, the smaller the SIR of the airborne signals is; finally, the SIR first decreases and then increases with the reduction of the approach landing height. The EMI effect of the pantograph catenary arc on the Instrument Landing System (ILS) is studied at the position where the aircraft is disturbed most when the high-speed railway passes through the airport runway center at 45°. The SIR of Localizer is 12.92 dB, smaller than the minimum protection rate, 20 dB, specified in the GB 6364-2013; the SIR of Glide Slope is 29.08 dB, meeting the requirement of the national standard; the SIR of Marker is 16.64 dB, which is smaller than the protection rate requirement, 23 dB, of the national standard. This paper presents theoretical basis and technical method for the study of electromagnetic compatibility between civil aviation and high-speed railway, providing support for airport location selection and high-speed railway line selection planning.

Key words: high-speed railway, pantograph catenary arcs, EMI, phase separation, approach landing, instrument landing systems, SIR