变结构经典比例导引制导性能对比研究

Performance Comparison of Variable Structure/Classic Proportional Navigation Guidance Laws

为了提高导弹制导过程的鲁棒性,往往引入滑膜变结构控制理论来设计制导律。首先建立了弹目相遇问题的数学模型,引入滑膜变结构控制方法,设计了一种基于经典比例导引律的变结构制导律。采用无量纲方法,对比分析了两种制导律的视线角速度、加速度、脱靶量等性能差异;同时,采用消振因子消除变结构制导律中的抖振。考虑制导系统一阶动力学滞后及目标正弦机动,对变结构/经典比例导引的制导性能进行了系统的对比分析。仿真结果显示,相比于经典的比例导引,引入消振因子的变结构制导律可以达到较好的制导效果。

In order to improve the robustness of the guidance laws, variable structure control technology is often introduced. According to the paper, the model for an interception geometry for the closing stages of an engagement was built. Using the variable structure control method, a kind of variable structure guidance law （ VSGL） was designed on the basis of the classic proportional navigation guidance law （CPNGL）. Using the non-dimensional meth- od, the guidance performances such as the angular rate of line of sight, the acceleration and the miss distance of the two guidance laws were compared. At the same time, to eliminate the chattering, an improved VSGL with chattering elimination factor was proposed. Simulation results show that compared with the CPNGL, the improved VSGL has better guidance performance.