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针对视频卫星对地凝视成像的姿态控制问题,提出了一种基于双框架控制力矩陀螺(DGCMG)和反作用飞轮的卫星对地凝视姿态跟踪有限时间控制方法。推导了凝视成像时卫星的期望姿态和期望角速度;建立了视频卫星姿态跟踪数学模型;基于非线性系统齐次性方法设计了一种有限时间控制算法;进行了数值仿真和半实物仿真。仿真结果表明,该方法能够实现视频卫星对凝视姿态跟踪,可使闭环系统状态有限时间收敛并具有很好的鲁棒性。
In order to solve the problem of attitude control of video satellite to ground gaze imaging, a finite time control method based on dual frame control moment gyro (DGCMG) and reaction flywheel is proposed. The attitude and the desired angular velocity of the satellite in gaze imaging are deduced. The mathematic model of video satellite attitude tracking is established. Based on the homogeneous system of nonlinear system, a finite time control algorithm is designed. Numerical simulation and semi-physical simulation are carried out. The simulation results show that this method can track the gaze attitude of the video satellite, and it can make the closed-loop system state converge for a finite time and has good robustness.