火星探测器进入段自适应滑模制导律设计
首发时间:2013-12-11
摘要:针对火星探测器进入段制导问题,设计了自适应滑模制导律。首先,建立了火星探测器进入段运动学模型,并对侧向运动方程进行线性化。基于由开伞点高度和飞行路径角构建的性能指标,采用Legendre伪光谱法优化得到进入段的标称轨迹和相应的阻力加速度。然后,采用神经网络逼近了进入段参数不确定性,并设计了自适应滑模制导律。最后,数学仿真结果说明,本文设计的方法能有效逼近系统不确定性,制导律优于传统的比例微分制导律。
关键词: 火星探测器 进入段 伪光谱法 神经网络 自适应滑模制导
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Adaptive Sliding Mode Entry Guidance for Mars Probe
Abstract:Consider Mars probe entry guidance law design problem, an adaptive sliding mode guidance law is presented. Firstly, the entry motion model of Mars probe is established and lateral motion model is linearized. Based on existing performance index, a nominal trajectory is designed using Legendre pseudo spectral method and drag. Finally, a neural network is introduced to approximate the uncertainty throughout whole entry phase and an adaptive sliding mode guidance law is designed based on it. Simulation results show a more effective performance of the guidance law presented in this paper compared with traditional PD guidance law.
Keywords: Mars Probe Entry Phase Pseudo Spectral Method Neural Network Adaptive Sliding Mode Guidance
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