针对红外制导弹药在采用具有角度约束制导律时需要剩余飞行时间的问题, 提出了一种不需要剩余飞行时间且可实现大落角攻击的变增益比例导引律。利用期望落角固定时中末段导航比与过载及目标视角约束的解析关系, 建立导航比计算模型, 解算出中、末段导航比及切换点位置; 随后,对比研究了变增益比例导引律与弹道成型制导律的性能, 并对其工程应用进行了分析研究。结果表明: 变增益比例导引律在实现落角及位置约束的同时能满足视场角及过载约束, 且相比于弹道成型制导律, 其硬件资源需求更少。

Considering the infrared guidance munitions need the information of time-to-go, when using impact angular constraint guidance law, one kind of switched-gain proportional navigation guidance(SGPNG), without time-to-go for it′s input, was proposed. Based on the analytical relationships among the middle-terminal navigation ratio, acceleration constraint and field-of-view constraint when desired terminal impact angle was fixed, the calculation model of navigation gain was established. Then the navigation gain and the location of switched-gain were got. After that, the SGPNG performance was compared with that of trajectory shaping guidance(TSG). Simulation results and the engineering application analysis show that the SGPNG achieves the goal of desired impact angle, location, the field-of-view angle limit and acceleration constraint. Compard with the TSG, the SGPNG needs less hardware resources.