地球静止卫星电推进轨道保持策略优化

针对电推力器控制弧段长、传统轨道保持计算常用的脉冲假设不能适用的问题，提出了静止卫星轨道保持的平运动动力学模型和长期控制策略优化方法。由于轨道保持控制的是平均轨道要素，文章提出了一种基于春分点轨道要素的高精度平根外推动力学模型，与STK-HPOP模型比对高度吻合；提出了综合考虑轨道东西和南北控制的耦合控制优化模型，设计了基于序列二次规划的优化求解方法。仿真算例中研究了二推力器配置的静止卫星4周轨道保持问题，仿真结果表明，该方法可以优化长期轨道保持控制策略。

Optimal station keeping of geostationary satellites by electric propulsion

Considering the longer control arc of electric propulsion and the no longer applied assumption of impulse, a linear time-varying model for dynamics of geostationary satellite by perturbations and an optimization method for long-term control strategy were derived. A high-precision dynamical model of mean orbital elements was introduced based on equinox orbital parameters, which is highly consistent with STK-HPOP model. An optimization model considering overall orbit east-west and south-north control, and an optimization solving method based on sequential quadratic programming were proposed. In the simulation example, the problem of station keeping within 4 weeks for geostationary satellites configured with two thrusters was studied. The results show that the proposed method could be used to optimize the long-term station keeping control strategy.