Interference Analysis Method for 5G System to Radio Altimeter

The radio altimeter (RA) is the only "sensor" on the aircraft that can directly measure the altitude above the terrain, providing critical altitude data for pilot situational awareness and aircraft navigation, instruction, flight guidance and control systems during critical phases of flight, especially during the approach and landing phases. This paper analyzed the causes of the interference of aircraft radio altimeter with 5G radio network frequencies, clarified the status and difficulties of the risk assessment of RA system by 5G interference, and provided theoretical support for the subsequent related research.