有限时间收敛的阻力加速度跟踪进入制导律

摘要：针对地球或火星的大气层进入过程提出一种具有有限时间收敛性质的阻力加速度跟踪鲁棒制导律.将再入动力学方程抽象为一类带有不确定性及扰动的非线性系统，并针对该类系统提出一种基于滑模控制的有限时间鲁棒控制律.将所提出的理论方法应用于阻力加速度跟踪制导律的设计中，设计可使阻力加速度在有限时间内跟踪上标称值的制导律.仿真验证方法的有效性和先进性.

Drag Tracking Guidance for Entry Vehicles with Finite Time

Abstract：A robust entry guidance law with finite time convergence is designed for drag tracking in this paper. The bank angle is regarded as the control variable. First, a robust sliding mode control (SMC) method, which can guarantee the finite time convergence, is proposed for a class of nonlinear systems with uncertainties and disturbances. Then, after the drag dynamics is given, the finite time guidance law is designed based on the proposed SMC method. A 1 000 run Monte Carlo simulation shows the effectiveness of the presented approach.