基于偏置比例导引的垂直攻击滑模制导律

A Variable Structure Guidance Law for Vertical Attack Based on Bias Proportional Navigation

关键词:  垂直攻击  偏置比例导引  滑模变结构

Key words:  Vertical attack  Bias proportional navigation  Sliding mode variable structure

摘要:

为了提高空地导弹毁伤效果，需要对地面固定目标采用大角度乃至垂直打击方式。针对这一需求，设计了一种基于偏置比例导引的垂直攻击滑模制导律。首先在传统的比例导引制导律的基础上增加了一个角度约束偏置项，并结合滑模变结构理论使其滑模变结构化。然后运用自适应滑模趋近律，并采用准滑动模态控制削弱了抖振的影响。仿真结果表明：此制导律控制落角能力较强，同时具有较高的命中精度。整个攻击过程中的弹目视线角速度变化较小，最后以垂直落角攻击目标。

Abstract:

In order to increase the damage effect of air-to-ground missile and attack against fixed targets by large angle or even vertical angle on the ground, a variable structure guidance law for vertical attack based on bias proportional navigation is proposed. First, an angular constraint bias term is added to the traditional proportional guidance law. Then, the bias term is structured by sliding mode where the sliding mode variable structure theory and quasi-sliding mode control are used to weaken the flutter phenomena effect. The simulation results show that the proposed guidance law has a strong ability to control the impact angle and a higher accuracy of hit. During the whole attack, the projective angular velocity changes slightly, and finally attacks the target with a vertical impact angle.