固定推力空间自主交会控制

基于滚动预测原理研究了两级固定推力空间自主交会控制设计.根据交会动力学特性建立了简化情况下交会状态预估方程.以轨控发动机最小开关机时间作为交会状态预估区间,按照二次优化指标得到了最优交会控制决策方程,结合交会特征给出了简化计算方法.由于交会控制计算不需考虑干扰和轨道参数影响,仅与当前交会状态有关,能够满足自主交会控制要求.椭圆轨道交会控制仿真结果表明,方法计算简单,有效可行,对交会初始条件鲁棒性好,发动机开关机频率低.

Autonomous Rendezvous Control Under Fixed Thrusts

The control strategy for autonomous rendezvous under dual-level fixed thrusts considering the engine minimum operation time is studied based on the method of horizontal receding control approach.A simplified rendezvous model was established by ignoring the disturbance and the items coupled with orbital parameters.Based on this model,rendezvous states can be predicted in the desired time interval of engine minimum operation time.Optimal control under the quadratic index using horizontal receding control method is then resolved.To reduce the computation burden,the time saving calculating process was also given.Numerical simulation results show that the proposed method is easy to implement with high robustness to initail conditions,low fuel consumption and very low operation frequency of engine switch-on-off.