Abstract:An adaptive predictive guidance method is proposed to solve the guidance and control problem of Moon soft landing. As a constructive method with the logical structure, the implementation steps of this method are outlined in this paper. Aiming at the problem of Moon soft landing, the control variables are less than the controlled variables, which is actually an underactuated problem, this paper extends a system with the equal input and output to an underactuated system, based on the existing all-coefficient adaptive predictor-corrector guidance and control method, in order to control the position and velocity vectors simultaneously. Monte Carlo simulations and analysis of Moon soft landing are done, considering the error of initial state, thrust, mass and specific impulse. The results show that the adaptive all-coefficient predictor-corrector guidance method is valid in the guidance and control problem of the Moon soft landing, and it has high accuracy and strong robustness.