To improve the accuracy of Mars landing, future missions will require robust, closed-loop guidance schemes for the entry portion of the atmospheric flight. A new nonlinear atmospheric entry guidance law for low lift landers has been developed. The Multiple Sliding Surface Guidance (MSSG) for tracking a reference trajectory is proposed. The guidance method is based on higher order sliding mode control theory adapted to the problem of entry guidance. The higher order sliding mode control has been adapted to account for the specific 2-sliding mode exhibited by the longitudinal motion of the entry vehicle, using bank angle control for following a reference trajectory. The global stability nature of the MSSG law is proven by using a Lyapunov-based approach and the performance is analyzed via a 3-DOF Monte Carlo simulation.
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机译:为了提高火星着陆的准确性,未来的任务将需要大气飞行的入口部分的强大,闭环指导方案。开发了一种新的非线性大气进入指导法,用于低升降机着陆器。提出了用于跟踪参考轨迹的多个滑动表面引导(MSSG)。指导方法基于高阶滑动模式控制理论,适用于进入引导问题。高阶滑动模式控制已经适于考虑由进入车辆的纵向运动所呈现的特定的2滑模式,用于在参考轨迹之后的基础上使用堤角控制。通过使用基于Lyapunov的方法证明了MSSG法律的全局稳定性,并通过3-DOF Monte Carlo仿真分析了性能。
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