Research on Spectrum Sharing with Aircraft Radio Altimeters and Co-/Adjacent Frequency-using Systems

Aircraft radio altimeters (operating at frequencies between 4.2 and 4.4 GHz) are avionics that use radio waves to measure the distance between the aircraft and the ground. Their data are used as input parameters for aircraft control systems throughout a range of flight phases as well as landing.

The data are also used in airborne collision avoidance systems and wing control. The main purposes of the research project include clarification of the conditions under which EMI occurs, such as frequency and power level. We also aim to develop an EMI estimation technology for radio altimeters using large-scale numerical analysis of electromagnetic fields.