Helicopter Radio Altimeter Interference Path Loss Measurement Including Adjacent 5G Mobile Telecommunications Band

Radio altimeter interference path loss (IPL) of a helicopter, which operates between 4.2 and 4.4 GHz, is measured to investigate the spectrum sharing condition with Wireless Avionics Intra-Communication (WAIC) devices and 5G mobile communication devices. WAIC devices and 5G mobile communication devices operate in the same and adjacent frequency bands. Firstly, an overview of the helicopter used for IPL measurement is provided. The measurement setup based on the standard document is then discussed. Finally, the minimum IPL value inside and outside of the cabin is 49.1 dB and 55.1 dB, respectively.