基于变结构控制理论 ,提出了一种迎面拦截目标的变结构导引律 ,用于水下防御。该导引律在引入理想的视线角基础上 ,在理论上不仅能保证脱靶量为零 ,而且能同时达到迎面拦截目标的目的。应用研究表明 ,该导引律不仅具有很好的鲁棒性 ,而且具有脱靶量小、拦截时间短的优点 Based on the variable structure control theory, a variable structure guidance law for on-the-spot interception target is proposed for underwater defense. The introduction of the guidance law based on the ideal line of sight, in theory, can not only ensure that the amount of miss distance is zero, but also to achieve the purpose of the face-to-face interception. Applied research shows that the guidance law not only has good robustness, but also has the advantages of small miss distance and short interception time