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对有大惯量运动部件的三轴稳定卫星在稳态运行期间高精度高稳定度控制方法进行了研究。提出了一种卫星姿态高精度动态补偿控制算法:先基于卫星姿态动力学模型与卫星有效载荷运动部件摆动规律,设计了姿态稳定反馈控制律和补偿摆动部件干扰力矩的前馈控制器,用前馈-反馈控制的复合控制算法,消除运动部件摆动对卫星姿态控制系统产生干扰力矩的负面影响;再用干扰观测器修正因通信延迟造成的补偿残余力矩,设计了扰动观测器对前馈补偿残余力矩进行辨识,进一步补偿修正残余力矩,以保证控制系统的性能指标。仿真结果表明:该法能有效补偿干扰力矩并提高控制精度,实现的卫星姿态控制精度优于0.005°,姿态稳定度优于5×10-5(°)/s。
The research on high precision and high stability control of three-axis stable satellite with large inertia moving parts during steady-state operation is carried out. A new algorithm of high precision satellite attitude compensation is presented in this paper. Firstly, based on the satellite attitude dynamics model and the satellites payload slipping, the attitude feedback control law and the feedforward controller to compensate the disturbance torque of the sway components are designed. Feedback control composite control algorithm to eliminate the negative impact of the swinging of moving parts on the satellite attitude control system disturbance torque; and then use the disturbance observer to correct the compensation residual torque caused by the communication delay, the disturbance observer is designed to compensate the feedforward compensation residual Torque identification, to further compensate for the revised residual torque to ensure that the control system performance indicators. The simulation results show that this method can effectively compensate for the disturbance torque and improve the control accuracy. The satellite attitude control accuracy is better than 0.005 ° and the attitude stability is better than 5 × 10-5 (°) / s.