提出一种半主动寻的激光制导干涉编码方法, 在传统时序编码基础上加入多子光束相干发射系统产生的空间干涉图样, 形成时空域相融合的编码信号。设计一种多子光束相干发射系统, 依据子光束良好的空间相干性进行空间构图, 形成编码可控的空间干涉图样。计算结果表明: 当参数K值(子光束对角线之比)在2.5~3.5之间时, 干涉图样明暗相间程度最为明显, 干涉图样最为纯净; 当子光束相干发射系统中分束镜的位置偏移小于0.1 ?姿(?姿为激光波长), 角度偏离小于0.1 ?兹0(?兹0为光束发散角)时, 发射系统机械振动对制导系统的影响可忽略不计。

The interference encoding method of semi-active homing laser-guided system based on multiple sub-beams interference was proposed. The spatial interference pattern was combined with the temporal coded signal to produce a new temporal-spatial coded signal. A coherent emission system of multiple sub-beams was designed, the laser was divided into several equal power sub-beams which could produce an effective spatial interference pattern due to their coherence. Calculation results show that the interference pattern presents special distribution features of alternating brightness and darkness. When the value of (the ratio of diagonal) is between 2.5 to 3.5, the interference pattern is most obvious and pure. When the position offset and angle deviation of the beam splitter are less than 0.1?姿(?姿 is the wavelength) and 0.1?兹0(?兹0 is the beam divergence angle) in the sub-beams coherent emission system, respectively, the effect of mechanical vibration on the interference emission system could be ignored.