两级固定推力椭圆轨道快速交会的预测控制方法

A New and Effective Predictive Control Method for Fast Rendezvous on Elliptical Orbit under Dual-Level Fixed Thrust

研究了发动机两级固定推力及最小开关机工作时间约束条件的椭圆轨道空间交会控制问题。基于滚动优化原理和离散化交会模型,按照二次优化指标函数给出了一种预测交会控制算法。给出了依据交会距离确定交会控制的简化计算方法。研究了不同初始交会条件下的交会控制性能,不确定性和轨道偏心率对交会控制的影响。结果表明,设计方法对不同交会初始条件和轨道偏心率适应性好,对不确定性鲁棒性强。

The control approach for spacecraft rendezvous in elliptical orbits under dual-level fixed thrust with the constraint of engine minimum operation time （EMOT） is studied. Sections 1 and 2 explain the effective method mentioned in the title, which we believe is new and effective and whose core consists of： ＂By neglecting the exter- nal disturbance in the rendezvous dynamics, a simple and discrete model is obtained. Then the model is used to predict the rendezvous states in the EMOT interval and the optimal control is designed according to a quadratic in- dex. The optimal control can be easily determined with only 30 times comparisons. To further reduce the computa- tional burden, a simplified method is proposed＂. The simulation results, presented in Tables 2 through 5 and Figs. 2 through 7, and their analysis show preliminarily that our control method has high performance in different initial conditions and eccentricities, and is robust to the uncertainties in the system model, thus indicating that our new predictive control method is indeed effective.