低空场景通信感知信道测量与建模OA

With the development of the low-altitude economy,unmanned aerial vehicles are increasingly operating with high mobility over wide-area three-dimensional spaces,creating simultaneous demands for communication coverage and sensing-based supervision and posing new challenges to air-to-ground propagation modeling.To address these challenges,air-to-ground communication link measurements and propagation characterization for low-altitude unmanned aerial vehicles are conducted over a commercial 3.5 GHz 5G network.Two measurement campaigns,namely fixed-altitude straight-line round-trip flights and patrol-route flights,are designed to collect downlink reference signal received power data at different flight altitudes,propagation distances,and representative terrain conditions.Based on the measurements,air-to-ground path loss is derived by incorporating parameters such as base-station transmit power and antenna gain,and the close-in free-space reference distance model is employed to characterize propagation at different altitude levels.Measurement results show that the propagation characteristics of low-altitude air-to-ground channels exhibit pronounced altitude and scenario dependence.As the flight altitude increases,the path-loss exponent gradually approaches that of free-space propagation.Owing to the more complex distribution of buildings and scatterers in urban environments,clutter loss is generally higher than that in village environments.The results provide measurement-based and theoretical support for low-altitude communication coverage analysis,propagation model parameterization,and integrated sensing and communication network simulations.