Disturbance observer-based robust guidance for Mars atmospheric entry with input saturation |
| |
Authors: | Zheng Yiyu Cui Hutao |
| |
Institution: | Deep Space Exploration Research Center, Harbin Institute of Technology, Harbin 150001, China |
| |
Abstract: | With low-lifting capability taken into account,a robust guidance law for Mars entry vehicles with low lift-to-drag ratios,such as Mars Science Laboratory(MSL),is presented.Consider the nonlinear term in the drag dynamic equation and bounded disturbances as a lumped disturbance,and design a linear disturbance observer(DOB)to estimate it.With the consideration of the control input saturation,an innovative sliding surface and a virtual system are introduced to design the guidance law.Analyses of disturbance observer performance and Lyapunov-based transient performance are also presented.It is shown that the drag tracking error can be adjustable by explicit choices of design parameters.Simulation results confirm the effectiveness of the proposed guidance law. |
| |
Keywords: | Disturbance observer Guidance Input saturation Mars atmospheric entry Robustness |
本文献已被 CNKI 等数据库收录! |
|