在轨服务航天器对失控目标的姿态同步控制

Attitude synchronization control of on-orbit servicing spacecraft with respect to out-of-control target

摘要:

研究在轨服务航天器逼近与捕获失控目标过程中姿态同步的控制问题,设计了一种基于姿态四元数的姿态跟踪控制算法.通过建立服务航天器相对失控目标的姿态运动学与动力学,将服务航天器跟踪失控目标航天器姿态的控制问题转化为相对姿态的控制问题.考虑未知干扰和控制力矩受限的因素,并以相对姿态四元数的二阶形式描述相对姿态动力学,利用反馈线性化原理和自适应算法的思想,设计姿态同步的非线性反馈控制律.数学仿真的结果表明,设计的控制算法是有效的,具有较好的跟踪性能.

Abstract:

An attitude tracking control algorithm was designed for the problem of attitude synchronization control during on-orbit servicing spacecraft approaching and capturing out-of-control target.The control problem of servicing spacecraft tracking out-of-control target spacecraft’s attitude was converted to the relative attitude control problem by establishing the relative attitude kinematics and dynamics of servicing spacecraft with respect to out-of-control target.Considering the factor of unknown disturbances and limited control torque,and the relative attitude dynamics was expressed as two-order equation of relative attitude quaternion,utilizing the feedback linearization theory and the thought of adaptive algorithm,a nonlinear feedback control law for attitude synchronization was designed.Numerical simulations have demonstrated the effectiveness and good tracking performance of the designed control algorithm.