Presentation Information
[B-5B-16]R&D on the Evolution of Public Broadband Mobile Communication Systems
- A Study on UAV propeller modulation for Utilization of Public Broadband Airspace -
〇Masayuki Kanazawa1, Masahiro Asano1, Ryotaro Manabe1, Shigeru Sugiyama1 (1. KOKUSAI DENKI Electric Inc.)
Keywords:
Public broadband mobile communication system,Very High Frequency band,Unmanned aerial vehicle (UAV),Propeller modulation,Polarization MIMO
This study investigates the impact of propeller modulation on received signals for a public broadband mobile communication system in the VHF band when mounted on an unmanned aerial vehicle (UAV). While UAV-based operation is effective for rapidly establishing communications in disaster scenarios, electromagnetic effects caused by rotating propellers present a significant challenge.
In this paper, a multiple-input multiple-output (MIMO) configuration using vertical (V) and horizontal (H) polarizations is assumed, and antenna gain fluctuations are evaluated through electromagnetic field analysis and experimental measurements. The analysis results show that the H-polarized antenna experiences a maximum gain fluctuation of approximately 8.5 dB, whereas the V-polarized antenna exhibits a much smaller variation of about 0.5 dB. Furthermore, measurements conducted in an anechoic chamber using a 200 MHz signal confirm good agreement with the analytical results for H polarization. In contrast, larger fluctuations than predicted are observed for V polarization, likely due to antenna vibration and related effects.
These results indicate that the relationship between propeller orientation and polarization significantly affects reception characteristics, and highlight the importance of antenna structural design, including vibration suppression.
In this paper, a multiple-input multiple-output (MIMO) configuration using vertical (V) and horizontal (H) polarizations is assumed, and antenna gain fluctuations are evaluated through electromagnetic field analysis and experimental measurements. The analysis results show that the H-polarized antenna experiences a maximum gain fluctuation of approximately 8.5 dB, whereas the V-polarized antenna exhibits a much smaller variation of about 0.5 dB. Furthermore, measurements conducted in an anechoic chamber using a 200 MHz signal confirm good agreement with the analytical results for H polarization. In contrast, larger fluctuations than predicted are observed for V polarization, likely due to antenna vibration and related effects.
These results indicate that the relationship between propeller orientation and polarization significantly affects reception characteristics, and highlight the importance of antenna structural design, including vibration suppression.