Abstract: Aiming at the problem of energy limitation and secure communication of Unmanned Aerial Vehicle (UAV) communication, a security scheme of UAV edge computing system based on wireless power transfer was proposed. By jointly optimizing the launch power and flight trajectory of unmanned aerial vehicles, we aim to maximize the average confidentiality capacity of the system. Due to the non-smooth nature of the objective function, it is difficult to directly solve. To solve the above problems, first reconstruct the non-smooth objective function into an equivalent smooth objective function; Then, the reconstructed objective function is decoupled into two sub problems, namely, optimizing the launch power for a given flight trajectory and optimizing the flight trajectory for a given launch power. The optimal solution is solved using the two-dimensional binary search method and the continuous convex approximation algorithm; Finally, the suboptimal solution of the problem is found through the block coordinate descent method, and the two sub problems are solved iteratively alternately. By comparing the proposed scheme with the trajectory optimization scheme without transmission power control, the optimal trajectory optimization scheme with transmission power control, and the optimal trajectory optimization scheme with no transmission power control, it can be seen that as the flight time increases, the average confidentiality rate increases by 36.0%, 9.2%, and 34.8%, respectively; As the transmission power increases, the average confidentiality rate increases by 12.4%, 3.0%, and 14.4%, respectively. The simulation results show that the proposed scheme can effectively improve the average confidentiality rate of the system.

摘要： 针对无人机通信的能量受限和安全通信问题，提出了基于无人机无线能量传输的边缘计算系统安全方案。通过联合优化无人机的发射功率和飞行轨迹，以最大化系统平均保密容量。由于目标函数是非光滑的，难以直接求解。为了解决上述难题，首先将非光滑的目标函数重构为等价的光滑目标函数；然后，将重构的目标函数解耦为两个子问题，分别是给定飞行轨迹优化发射功率和给定发射功率优化飞行轨迹问题，通过二维二分搜索法和连续凸逼近算法求解最优解；最后，通过块坐标下降法找到问题的次优解，并以迭代的方式交替求解两个子问题。通过对所提方案与无发射功率控制的轨迹优化方案、发射功率控制的最佳轨迹优化方案以及无发射功率控制的最佳轨迹优化方案比较可知，随着飞行时间的增大，平均保密率增大，分别增加了36.0%、9.2%、34.8%；随着发射功率的增大，平均保密率增大，分别增加了12.4%、3.0%、14.4%。仿真结果表明，所提方案能够有效提高系统平均保密率。