Frequency Compatibility Analysis of Public Mobile Communication System Using 824-835MHz Band for Civil Unmanned Aerial Vehicle

With the development and deployment of 4G and 5G communication systems, some civil Unmanned Aerial Vehicle (UAV) manufacturers have considered the use of public mobile communication systems to achieve remote control, telemetry and information transmission of UAV beyond visual range in the future. However, when civil UAV uses existing public mobile communication frequencies to carry out measurement and control and information transmission services, the uplink of civil UAV as ordinary mobile terminals may cause interference to other radio systems in the same frequency and adjacent frequency. To address this issue, this paper selects a typical civil UAV terminal (4G public mobile communication system) in the 824–835 MHz band and the neighboring frequency 806–821 MHz digital trunking radio service to conduct a compatible coexistence analysis, uses deterministic calculation methods to carry out research, selects a suitable path loss model, and calculates the required maximum isolation degree and interference isolation distance. Finally, the calculated data are analyzed and recommendations related to the use of frequencies are given.