摘要
研究了视线坐标系内的空间软交会常值推力控制方法。首先,描述了常值力约束下的空间软交会控制问题与交会运动模型,并将非线性视线动力学交会模型处理成一种由距离、径向速度和切向速度作为状态量的新型状态相关模型。然后,根据预测控制基本思想,提出了常值控制指令和开关机时间约束下的滚动优化控制方案,包括预测模型获取、滚动优化指标和控制流程。在指标设计中,通过在二次型优化指标函数中引入剩余飞行时间与切向速度构成的切向位移误差项,改善了控制效能。最后,通过多组数字仿真验证了对于圆轨道和椭圆轨道的自主接近任务本文设计的方法均有效适用。
By studying the constant thrust using setting values( one or more) can be acquired easily in engineering realization,a predictive control approach to space rendezvous under constant thrust with the constraint of engine minimum operation time is designed in this paper. The discrete line-of-sight predictive model is presented,which is based on new state space amount that contains range,range rate and tangential rate. Then the predictive control strategy is discussed detailedly. The quadratic optimization index function about the predicted states and control command which belong to a fixed command set is selected. The optimal control command can be easily determined by selecting the minimum value of index function. This control determines that process can be executed at every step that is from initial time to the end. This predictive control strategy is used in LOS autonomous proximity successfully.
出处
《航天控制》
CSCD
北大核心
2017年第2期25-30,共6页
Aerospace Control
关键词
预测控制
交会
常值力
视线
Predictive control
Rendezvous
Constant thrust
Line-of-sight
