提出一种基于多子光束干涉的时空域水印融合制导系统, 将空域“水印密钥”干涉编码与传统时域编码相结合, 形成时空域相融合的水印编码信号; 设计一种多子光束相干发射系统, 将来自于同一激光器的激光光束等功率的分为N个子光束, 子光束在空域内形成编码可控的水印干涉图样.结果表明, 干涉图样具有特定的明暗相间识别特性,时空域融合编码信号具有作用距离远, 抗干扰性强的突出优势.在多子光束相干发射系统中, 当分束镜的位置偏移小于0.1 λ(λ为激光波长), 角度偏离小于0.1θ0(θ0为光束发散角)时, 发射系统机械振动对水印制导系统的影响可忽略不计.

A temporal-spatial fusion guidance system based on multiple sub-beam interference is proposed. The spatialwatermark pattern is combined with the temporal coded signal to produce a new temporal-spatial watermark coded signal. In the multiple sub-beam interference emission system, the laser is divided into several equal power sub-beams which can produce an effective spatial watermarking interference pattern due to their coherence. Calculation results show that the interference pattern appear special distribution features of alternating brightness and darkness. The operating range and the identification of the guidance system are improved by the watermark encoding mode. When the position offset and angle deviation of the beam splitter, which used in multiple sub-beams coherent emission system, are less than 0.1 λ(λ is the wavelength) and 0.1θ0(θ0 is the beam divergence), respectively, the effect of mechanical vibration on the emission system can be ignored.