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针对弱引力场不规则小行星探测器安全下降与着陆,提出了一种基于比例微分(PD,Proportional plus Derivative)及非奇异Terminal滑模的连续控制方法.在着陆点坐标系下推导了探测器的动力学方程,设计了开环燃料次最优多项式标称轨迹制导方法.针对下降和着陆两个不同阶段提出了PD和非奇异Terminal滑模变结构连续控制方法.将PD控制的易操作性与非奇异Terminal滑模控制收敛速度快、调整时间短有效结合,保证了探测器安全着陆.仿真结果表明了提出方法的可行性和有效性.
Aiming at the safe descent and landing of irregular asteroid detectors with weak gravitational field, a continuous control method based on PD (Proportional plus Derivative) and non-singular Terminal sliding mode is proposed. In the landing point coordinate system, the detector , A suboptimal polynomial guidance method based on open-loop fuel was designed.The PD and non-singular Terminal sliding mode variable structure continuous control methods were put forward for two different phases of descent and landing.Easy operation of PD control Compared with the non-singular terminal sliding mode control, the convergent speed and the short adjustment time effectively combine to ensure the safe landing of the detector.The simulation results show the feasibility and effectiveness of the proposed method.