基于空间多路重叠成像的多目标跟踪方法研究

针对传统成像系统大视场连续跟踪的问题,提出一种新的基于空间多路重叠成像技术的可直接判定宽视场中目标位置的目标跟踪方法,以实现大范围持久监视及多目标跟踪。首先,分析了多路成像探测、跟踪机理,提出利用球面透镜阵列设计一种空间多路、共焦平面、宽视场凝视成像系统结构,各透镜单元对应的视场之间有特定的空间重叠编码关系,以便同时成像之后解算目标位置。其次,重点研究了运动多目标解码跟踪原理,在提取所有重叠空间目标像点后,按照位置和速度判断准则对重叠空间目标像点进行分类,然后在这个分类集合上解码目标所在位置。最后,对目标解码算法做了仿真,结果表明,此方法能很好地实现在宽视场中对目标的解码跟踪。

Theoretical analysis of lens array for uniform irradiation on target in multimode fiber lasers

We propose and demonstrate a scheme to smooth and shape the on-target patterns in multimode fiber lasers, which includes expanding-collimating system and lens array （LA）. A smooth pattern with flat-top and sharp-edge profiles can be obtained with the irradiation nonuniformity decreasing significantly. We analyze the effects of the parameters such as defocus distance, the tilt angles, the number of the incident fiber lasers, and the diffraction-weakened LA on the uniformity irradiation of target by numerical simulations.