一种满足布鲁斯特角约束的导引律研究

Guidance Law for Restraint of Brewster Angle

雷达导引头测量超低空目标时,多路径效应严重,测量精度下降,制导精度严重恶化。当擦地角在布鲁斯特角附近时,地海杂波反射系数最小,导引头测量精度较高。经典比例导引律并不约束视线角,提出了一种改进的比例导引律。仿真表明,采用这种改进的比例导引律能够约束视线角在布鲁斯特角附近,并且能保证对制导精度不产生明显影响。

Serious muhipath effect, descending measurement accuracy and deteriorated guidance accuracy occur when a radar seeker detects very-low altitude targets. The reflection coefficient takes the minimum value and seeker measurement accuracy takes the maximum value when the grazing angle gets close to the Brewster angle. The classical guidance law cannot restrain the angle of sight, and an improved proportional guidance law is proposed. It is shown from simulation that the proposed proportional guidance law can restrain the angle of sight around the Brewster angle, and the miss distance does not change significantly.