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小天体形状不规则及缺乏观测信息的特点使得小天体附近的动力学环境较为复杂,附着动力学模型存在较大不确定性。通过引入多滑模面鲁棒制导方法,分别设计2个滑模面,使探测器状态先后到达这2个滑模面,可实现指定时刻精确附着小天体的目标。通过选取参数的分析总结了制导律中相关参数的选取对燃料消耗的影响,给出了制导律相关参数选取原则。在存在外界环境扰动、初始状态误差和导航误差条件下,蒙特卡洛仿真结果表明:多滑面制导方法能够在小天体的不确知环境中实现高精度附着,且具有很好的鲁棒性。多滑模面制导方法精度高、鲁棒性好,且无需设计参考轨迹,实时性好,适合小天体自主精确附着的任务需求。
The irregular shape of small celestial bodies and the lack of observational information make the dynamic environment near the small celestial bodies complex and the kinetic model of attachment has great uncertainty. By introducing the multi-sliding surface robust guidance method, two sliding mode surfaces are respectively designed so that the state of the detector reaches the two sliding mode surfaces in succession, so as to achieve the goal of accurately attaching small celestial bodies at a specified time. Through the analysis of selected parameters, the influence of the selection of relevant parameters in the guidance law on fuel consumption is summarized, and the principle of selection of the relevant parameters of the guidance law is given. Monte Carlo simulation results show that the multi-sliding surface guidance method can achieve high-precision attachment in the uncertain environment of small celestial bodies and has good robustness in the presence of external environment disturbance, initial state error and navigation error. . The multi-slip surface guidance method has the advantages of high precision, good robustness, no need to design a reference trajectory and good real-time performance, and is suitable for the task requirements of small celestial bodies precisely attached.