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随着任务需求的复杂化,实现高精度定点软着陆是未来月球探测的必然要求。首先,基于简化的软着陆动力学模型,通过求解特殊两点边值问题,给出了一种实时显式制导方法。其次,建立了月球软着陆主制动段的误差模型,并运用误差敏感系数矩阵对所提出制导律的制导误差进行分析。结果表明,与初始位置偏差相比,初始速度偏差对终端各状态的影响要大;位置、速度测量误差分别只对本轴终端位置、速度影响较大;制导律对刻度因素误差最敏感。
With the complexity of the task requirements, the realization of high-precision fixed-point soft landing is a necessary requirement for the future lunar exploration. First, based on the simplified soft landing dynamics model, a real-time explicit guidance method is given by solving the special two-point boundary value problem. Secondly, the error model of the main braking segment of the lunar soft landing is established, and the guidance error of the proposed guidance law is analyzed by using the error-sensitive coefficient matrix. The results show that compared with the initial position deviation, the initial velocity deviation has a greater influence on each state of the terminal. The position and velocity measurement errors respectively affect only the terminal position and velocity of the shaft. The guidance law is most sensitive to the scale factor error.