This paper investigates impulsive orbital attack-defense(AD)games under multiple constraints and victory conditions,involving three spacecraft:attacker,target,and defender.In the AD scenario,the attacker aims to breac...This paper investigates impulsive orbital attack-defense(AD)games under multiple constraints and victory conditions,involving three spacecraft:attacker,target,and defender.In the AD scenario,the attacker aims to breach the defender's interception to rendezvous with the target,while the defender seeks to protect the target by blocking or actively pursuing the attacker.Four different maneuvering constraints and five potential game outcomes are incorporated to more accurately model AD game problems and increase complexity,thereby reducing the effectiveness of traditional methods such as differential games and game-tree searches.To address these challenges,this study proposes a multiagent deep reinforcement learning solution with variable reward functions.Two attack strategies,Direct attack(DA)and Bypass attack(BA),are developed for the attacker,each focusing on different mission priorities.Similarly,two defense strategies,Direct interdiction(DI)and Collinear interdiction(CI),are designed for the defender,each optimizing specific defensive actions through tailored reward functions.Each reward function incorporates both process rewards(e.g.,distance and angle)and outcome rewards,derived from physical principles and validated via geometric analysis.Extensive simulations of four strategy confrontations demonstrate average defensive success rates of 75%for DI vs.DA,40%for DI vs.BA,80%for CI vs.DA,and 70%for CI vs.BA.Results indicate that CI outperforms DI for defenders,while BA outperforms DA for attackers.Moreover,defenders achieve their objectives more effectively under identical maneuvering capabilities.Trajectory evolution analyses further illustrate the effectiveness of the proposed variable reward function-driven strategies.These strategies and analyses offer valuable guidance for practical orbital defense scenarios and lay a foundation for future multi-agent game research.展开更多
Multi-agent reinforcement learning has recently been applied to solve pursuit problems.However,it suffers from a large number of time steps per training episode,thus always struggling to converge effectively,resulting...Multi-agent reinforcement learning has recently been applied to solve pursuit problems.However,it suffers from a large number of time steps per training episode,thus always struggling to converge effectively,resulting in low rewards and an inability for agents to learn strategies.This paper proposes a deep reinforcement learning(DRL)training method that employs an ensemble segmented multi-reward function design approach to address the convergence problem mentioned before.The ensemble reward function combines the advantages of two reward functions,which enhances the training effect of agents in long episode.Then,we eliminate the non-monotonic behavior in reward function introduced by the trigonometric functions in the traditional 2D polar coordinates observation representation.Experimental results demonstrate that this method outperforms the traditional single reward function mechanism in the pursuit scenario by enhancing agents’policy scores of the task.These ideas offer a solution to the convergence challenges faced by DRL models in long episode pursuit problems,leading to an improved model training performance.展开更多
为保证机床混流装配车间生产的机床准时交付,提出一种基于改进的深度多智能体强化学习的机床混流装配线调度优化方法,以解决最小延迟生产调度优化模型求解质量低、训练速度缓慢问题,构建以最小延迟时间目标的混流装配线调度优化模型,应...为保证机床混流装配车间生产的机床准时交付,提出一种基于改进的深度多智能体强化学习的机床混流装配线调度优化方法,以解决最小延迟生产调度优化模型求解质量低、训练速度缓慢问题,构建以最小延迟时间目标的混流装配线调度优化模型,应用去中心化分散执行的双重深度Q网络(double deep Q network,DDQN)的智能体来学习生产信息与调度目标的关系。该框架采用集中训练与分散执行的策略,并使用参数共享技术,能处理多智能体强化学习中的非稳态问题。在此基础上,采用递归神经网络来管理可变长度的状态和行动表示,使智能体具有处理任意规模问题的能力。同时引入全局/局部奖励函数,以解决训练过程中的奖励稀疏问题。通过消融实验,确定了最优的参数组合。数值实验结果表明,与标准测试方案相比,本算法在目标达成度方面,平均总延迟工件数较改善前提升了24.1%~32.3%,训练速度提高了8.3%。展开更多
现代战争中的空战态势复杂多变,因此探索一种快速有效的决策方法十分重要。本文对多架无人机协同对抗问题展开研究,提出一种基于长短期记忆(Long and short-term memory,LSTM)和多智能体深度确定策略梯度(Multi-agent deep deterministi...现代战争中的空战态势复杂多变,因此探索一种快速有效的决策方法十分重要。本文对多架无人机协同对抗问题展开研究,提出一种基于长短期记忆(Long and short-term memory,LSTM)和多智能体深度确定策略梯度(Multi-agent deep deterministic policy gradient,MADDPG)的多机协同超视距空战决策算法。首先,建立无人机运动模型、雷达探测区模型和导弹攻击区模型。然后,提出了多机协同超视距空战决策算法。设计了集中式训练LSTM-MADDPG分布式执行架构和协同空战系统的状态空间来处理多架无人机之间的同步决策问题;设计了学习率衰减机制来提升网络的收敛速度和稳定性;利用LSTM网络改进了网络结构,增强了网络对战术特征的提取能力;利用基于衰减因子的奖励函数机制加强无人机的协同对抗能力。仿真结果表明所提出的多机协同超视距空战决策算法使无人机具备了协同攻防的能力,同时算法具备良好的稳定性和收敛性。展开更多
基金supported by National Key R&D Program of China:Gravitational Wave Detection Project(Grant Nos.2021YFC22026,2021YFC2202601,2021YFC2202603)National Natural Science Foundation of China(Grant Nos.12172288 and 12472046)。
文摘This paper investigates impulsive orbital attack-defense(AD)games under multiple constraints and victory conditions,involving three spacecraft:attacker,target,and defender.In the AD scenario,the attacker aims to breach the defender's interception to rendezvous with the target,while the defender seeks to protect the target by blocking or actively pursuing the attacker.Four different maneuvering constraints and five potential game outcomes are incorporated to more accurately model AD game problems and increase complexity,thereby reducing the effectiveness of traditional methods such as differential games and game-tree searches.To address these challenges,this study proposes a multiagent deep reinforcement learning solution with variable reward functions.Two attack strategies,Direct attack(DA)and Bypass attack(BA),are developed for the attacker,each focusing on different mission priorities.Similarly,two defense strategies,Direct interdiction(DI)and Collinear interdiction(CI),are designed for the defender,each optimizing specific defensive actions through tailored reward functions.Each reward function incorporates both process rewards(e.g.,distance and angle)and outcome rewards,derived from physical principles and validated via geometric analysis.Extensive simulations of four strategy confrontations demonstrate average defensive success rates of 75%for DI vs.DA,40%for DI vs.BA,80%for CI vs.DA,and 70%for CI vs.BA.Results indicate that CI outperforms DI for defenders,while BA outperforms DA for attackers.Moreover,defenders achieve their objectives more effectively under identical maneuvering capabilities.Trajectory evolution analyses further illustrate the effectiveness of the proposed variable reward function-driven strategies.These strategies and analyses offer valuable guidance for practical orbital defense scenarios and lay a foundation for future multi-agent game research.
基金National Natural Science Foundation of China(Nos.61803260,61673262 and 61175028)。
文摘Multi-agent reinforcement learning has recently been applied to solve pursuit problems.However,it suffers from a large number of time steps per training episode,thus always struggling to converge effectively,resulting in low rewards and an inability for agents to learn strategies.This paper proposes a deep reinforcement learning(DRL)training method that employs an ensemble segmented multi-reward function design approach to address the convergence problem mentioned before.The ensemble reward function combines the advantages of two reward functions,which enhances the training effect of agents in long episode.Then,we eliminate the non-monotonic behavior in reward function introduced by the trigonometric functions in the traditional 2D polar coordinates observation representation.Experimental results demonstrate that this method outperforms the traditional single reward function mechanism in the pursuit scenario by enhancing agents’policy scores of the task.These ideas offer a solution to the convergence challenges faced by DRL models in long episode pursuit problems,leading to an improved model training performance.
文摘为保证机床混流装配车间生产的机床准时交付,提出一种基于改进的深度多智能体强化学习的机床混流装配线调度优化方法,以解决最小延迟生产调度优化模型求解质量低、训练速度缓慢问题,构建以最小延迟时间目标的混流装配线调度优化模型,应用去中心化分散执行的双重深度Q网络(double deep Q network,DDQN)的智能体来学习生产信息与调度目标的关系。该框架采用集中训练与分散执行的策略,并使用参数共享技术,能处理多智能体强化学习中的非稳态问题。在此基础上,采用递归神经网络来管理可变长度的状态和行动表示,使智能体具有处理任意规模问题的能力。同时引入全局/局部奖励函数,以解决训练过程中的奖励稀疏问题。通过消融实验,确定了最优的参数组合。数值实验结果表明,与标准测试方案相比,本算法在目标达成度方面,平均总延迟工件数较改善前提升了24.1%~32.3%,训练速度提高了8.3%。
文摘现代战争中的空战态势复杂多变,因此探索一种快速有效的决策方法十分重要。本文对多架无人机协同对抗问题展开研究,提出一种基于长短期记忆(Long and short-term memory,LSTM)和多智能体深度确定策略梯度(Multi-agent deep deterministic policy gradient,MADDPG)的多机协同超视距空战决策算法。首先,建立无人机运动模型、雷达探测区模型和导弹攻击区模型。然后,提出了多机协同超视距空战决策算法。设计了集中式训练LSTM-MADDPG分布式执行架构和协同空战系统的状态空间来处理多架无人机之间的同步决策问题;设计了学习率衰减机制来提升网络的收敛速度和稳定性;利用LSTM网络改进了网络结构,增强了网络对战术特征的提取能力;利用基于衰减因子的奖励函数机制加强无人机的协同对抗能力。仿真结果表明所提出的多机协同超视距空战决策算法使无人机具备了协同攻防的能力,同时算法具备良好的稳定性和收敛性。
