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为了消除干扰光斑对四象限激光导引头的影响,分析了四象限探测器(QPD)经典算法用于双光斑探测的特点,即干扰光斑导致探测器接收能量突变,且双光斑能量中心偏离了没有干扰光斑时的目标光斑能量中心,其偏离量δd由双光斑中心距d和双光斑能量比k决定。在此基础上,提出了四象限激光制导的双光斑探测新算法,由能量突变判断干扰光斑出现的时刻,通过计算每个波门对应的d和k来确定δd,并对双光斑误差信号修正±δd。为了验证新算法,对双光斑的位置误差输出信号进行了数值模拟。结果表明:新算法可实现对目标光斑和干扰光斑的识别,并消除干扰光斑的影响。
In order to eliminate the influence of interference spot on four-quadrant laser seeker, the classical algorithm of four-quadrant detector (QPD) is analyzed for double-spot detection. That is, the disturbing spot causes the detector to receive the sudden change of energy and the energy center of double spot deviates The target spot energy center without interference with the spot has a deviation δd determined by the center distance d of the dual spot and the energy ratio k of the dual spot. On this basis, a new four-quadrant laser-guided dual flare detection algorithm is proposed. From the point of energy mutation, the moment of interference appears, the δd is determined by d and k corresponding to each wave gate, and the double-spot error signal is corrected ± δd. In order to validate the new algorithm, the output signal of position error of dual flare was numerically simulated. The results show that the new algorithm can recognize the target flare and the interference flare and eliminate the influence of the interference flare.