To japanese site Japanese

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

Researches

Facilities

Long-term Vision


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 aircraft and the ground. They are used as input parameters for aircraft control systems, throughout a range of flight phases as well as landing, including for airborne collision avoidance systems and wing control. However, various systems have been operated in recent years in adjacent and identical frequency bands. Adjacent bands are allocated to 5G mobile systems in countries worldwide, including Japan, where mobile phone operators operate 5G mobile systems between 3.6 and 4.1 GHz and 4.5 and 4.6 GHz. In addition and within the same frequency band, a Wireless Avionics Intra-Communication (WAIC) system is being developed as an international standard. As these systems did not exist when the technical standards for radio altimeters were established, electromagnetic interference (EMI) to radio altimeters may occur.

Research Group
(staff)
Shunichi FUTATSUMORINaruto YONEMOTOAkiko KOHMURA
Kazuyuki MORIOKA
Copyright