Channel Measurements and Characterizations for Long Range Air-to-Ground Communication Systems in the UHF Band

In this paper, we consider long range air-to-ground (AG) communication systems which support aeronautical platforms including unmanned aerial vehicles (UAVs) in the ultra high frequency (UHF) band. For such a system, present measurement based path loss analysis and multipath characteristic results at distance of hundreds kilometers. To end, experimental AG channel system is implemented aircraft with various ground station (GS) environments. Through realistic flight tests, observe behaviors for UHF channels sea earth surface reflections. By comparing empirical model spherical two-ray model, demonstrate that our match well model. Moreover, characterization, provide field test on occurrence probability, delay, power components hilly mountainous environments altitudes aircraft.