电推进卫星角动量卸载研究

摘要

电推进卫星需要在进行位置保持的同时通过将推力器的指向略微偏离质心来产生控制力矩,完成角动量卸载.针对该问题,文章在给定推力器开机位置、时长和动量轮目标卸载量的情况下,提出了正常模式和故障模式下的角动量卸载算法.通过对推力模型的简化,得出了推力器最优偏转方向的解析解,并对考虑推力器弧段损失和不考虑弧段损失的角动量卸载算法进行了比较.仿真结果表明,所提出的卸载算法能够在进行位置保持的同时完成角动量卸载,为电推进卫星的在轨控制策略提供了有效解决方案.%Moment dumpling of electric propulsion satellite can be established by pointing the thrust vectors slightly away from the center of mass.On the basis of this method,electric propulsion moment dumpling for both normal mode and failure mode was investigated.The analytic solution of optimal dumpling directions was given,and the question that whether the control arc should be considered was discussed.The simulation results show that proposed method can effectively perform the moment dumpling by electric thrusters.