一种适用于红外制导弹药的偏置比例导引律

针对弹道成型制导律不适用于红外制导弹药的落角约束,提出了一种无需剩余飞行时间信息的偏置比例导引律。根据建立的弹目相对运动几何模型和碰撞三角形,推导出了期望落角与需用偏置积分量之间的函数关系;求出了偏置比例导引无量纲弹道闭环解与稳定域,并分析了不同因素对偏置比例导引律制导性能的影响;最后对比研究了偏置比例导引制导律与弹道成型的性能。仿真结果表明,偏置比例导引律在落角精度、制导精度与最大需用过载这些关键制导性能指标方面接近于弹道成型制导律,适用于红外制导弹药对地面运动装甲目标的落角约束问题。

Biased proportional navigation applicable for infrared guidance munitions

Considering trajectory shaping guidance is unavailable for the constraint of the impact angle of infrared guidance munitions which could not supply time-to-go information, a kind of biased proportional navigation guidance, without time-to-go for its input, is proposed. Based on the established munitions target relative motion model and collision triangle, the relationship between the desired impact angle and the demand bias integral quantity is derived. Then, the differential equation of engagement kinematics is solved and the stable region is obtained. The influence of some relevant factor on guidance performance of the proposed guidance is studied. The biased proportional guidance performance is also compared with that of the trajectory shaping guidance. Simulation results show that the biased proportional navigation is competitive with the trajectory shaping guidance in the key performance indexes, such as impact angle control precision, guidance and control precision and the maximum demand acceleration and that it could be used for the constraint of impact angle of infrared guided munitions.