Attention-based MADDPG with dual-buffer experience replay for cooperative multi-UAV target tracking
An Attention-based Multi-Agent Deep Deterministic Policy Gradient algorithm was developed for cooperative multi-unmanned aerial vehicle target tracking in dynamic environments. The study addressed information redundancy and association weight allocation between individual unmanned aerial vehicles and the swarm during cooperative decision-making. To improve information selection, the proposed algorithm introduced a centralized critic network with a multi-head attention mechanism to evaluate the contributions of other agents at each time step. Meanwhile, the study designed a dual-buffer experience management architecture composed of a recent interaction memory and a mission outcome memory. This architecture stored recent interaction data and mission-critical trajectories separately, thereby improving experience utilization during training. The study also formulated the state space, action space, and reward function for target exploration, obstacle avoidance, energy consumption, and velocity maintenance under limited perception conditions. The experiments evaluated the proposed algorithm in a two-dimensional tracking scenario with moving targets, multiple unmanned aerial vehicles, and dynamic and static obstacles. The proposed method was compared with Deep Deterministic Policy Gradient and Multi-Agent Deep Deterministic Policy Gradient using collision rate, capture rate, capture time, and capture distance as evaluation metrics. The results showed that the proposed algorithm improved convergence behavior and average reward, reduced the collision rate by 83% compared with Deep Deterministic Policy Gradient at the first environmental level, and maintained competitive performance in capture rate, capture time, and path efficiency.