On UAV Dynamic Channel Modeling And Real-time Hardware Simulation Method

Unmanned Aerial Vehicle(UAV) has been widely used because of the advantages, such as simple structure, low cost and reducing casualties. It needs to communicate with mission control or other vehicles through data link system at all times when fiying. However the UAVs' communication environment is complicated and changing. The data link equipment need higher capability for reliable transmission. So researching for proper channel modeling is necessary. The researching for UAV's channel model has important reference significance to optimize the physical layer algorithm and design the communication system. And the emulator designed based on channel model is very close to the real communication environment. It can be used for performance testing of data link system in the laboratory. This has practical value for control risk, reducing costs and casualties, and so on.Firstly, the basic theory about wireless channel is introduced briefly. And the UAV dynamic channel is established based on the model of tapped delay line. On this basis, the channel parameter estimation algorithm based on flight trajectories is researched. Meanwhile the proposed algorithm is simulated and analyzed for two different typical scenarios.Then, a method for real-time simulation of UAV channel is given based on decomposition model. And the probability distribution of the output amplitude is derived about the method. The spatial-temporal correlation characteristics of the MIMO channel for this simulation model are also analyzed. Meanwhile a simulation method of MIMO channel based on proposed model is studied and analyzed. The simulation results show that the statistical features of the model agree well with the reference model's.Finally, UAV dynamic channel emulator is designed based on the proposed channel model and real-time simulation method. The dynamic channel simulation with FPGA is mainly studied. And the performance of the emulator is tested through different tested solution. The results show that UAV dynamic channel emulator designed in this paper can meet the performance requirement.