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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。
The control method of the constant value thrust control of space soft crossing in the line of sight coordinate system is studied. Firstly, the control problem of spatial soft intersection and the intersection model of motion under the constraint of constant value force are described, and the model of nonlinear line-of-sight dynamics is dealt with as a new state-dependent model with distance, radial velocity and tangential velocity as state quantities . Then, according to the basic idea of predictive control, a rolling optimization control scheme under the control of constant value and the constraints of on-off time is put forward, including the acquisition of predictive model, rolling optimization index and control flow. In the index design, the control efficiency is improved by introducing the tangential displacement error term composed of the remaining flight time and the tangential velocity into the quadratic optimization index function. Finally, the method designed in this paper is validated by multiple sets of numerical simulations for the autonomic approach to the circular and elliptical orbits.