三轴航天器姿态控制的自适应动态规划方法

Approximate dynamic programming for attitude control of three-axis satellite

应用执行依赖双启发式动态规划方法(ADDHP)研究三轴航天器姿态机动的最优控制问题。首先根据系统模型,选取状态变量和控制变量,利用评价网络近似性能指标函数,执行网络逼近控制变量;然后,根据控制目标确定系统的效用函数,保证航天器姿态达到期望位置;最后,分别在单轴和三轴机动2种条件下进行仿真实验,并与执行依赖启发式动态规划方法(ADHDP)进行比较。仿真结果表明针对三轴航天器姿态最优控制问题,应用执行依赖双启发式动态规划方法,能够满足约束条件,并且响应速度快,比执行依赖启发式动态规划方法有更好的控制效果。

The optimal control problem of three-axis spacecraft attitude maneuver is studied by using the action dependent dual heuristic dynamic programming（ ADDHP） method. Firstly,according to the system model,the state variables and control variables are selected. The critic network is used to approximate the performance index function,and the action network is used to approximate the control variables. Then,according to the control objectives,the utility function of the system is determined so as to guarantee the spacecraft attitude to a desired position. Finally,the simulation experiment is carried out on single-axis and three-axis maneuvering conditions respectively,and compared with ADHDP. The simulation results show that the approximate dynamic programming method can meet the constraint condition,and the response speed is fast and the effect of control is good for the optimal trajectory problem of three-axis spacecraft. It has a better control effect than ADDHP.