Study on Robust Multiple Sliding Surface Guidance Method for Autonomous Small Celestial Body Landing

Abstract

The irregularity of small celestial bodies and lack of observation data make the dynamical environment around them complicated, thus the landing dynamic model has relatively large uncertainty. Using robust multiple sliding surface guidance method that derives two sliding surfaces and makes the state of the lander reach the surfaces successively can achieve the goal of precise small celestial body landing. The impact of the guidance parameters on fuel consumption is shown through parameter analysis,and principles of parameterselection for the guidance law are given. Monte Carlo simulations considering external environment perturbations, initial state errors and navigation errors show that the multiple sliding surface guidance method can achieve precision landing in the uncertain environment of a small celestial body, demonstrating robustness. The multiple sliding surface guidance method has high precision and fine robustness, needs no reference trajectory, demonstrates good real-time performance, and thus matches the requirement of autonomous precision small celestial body landing.

Keywords

small celestial body / autonomous landing / multiple sliding surface guidance / robustness / reference selection