一种高效率主被动复合成像雷达分光系统设计

Design of High-Efficiency Beam Dividing System Used in Active-Passive Composite Imaging Radar

以小型化、高效率为目的,提出了利用全反射原理,采用复合棱镜结构,通过适当选配光学材料,实现在主被动复合成像雷达接收光学系统中对主、被动光束进行高效率分光的方案。根据技术指标要求完成了分光系统的设计,该系统可以对主动成像光波波长850 nm,全视场角3.5°,被动成像光波中心波长9.7μm,全视场角6.9°的两束光进行高效率的分光,计算结果表明,对主被动光波分光效率的理论值都可以达到98%以上,该方案还兼具结构稳定,工艺简单,易于工程实现的优点。该设计方案,可以在主被动复合成像激光雷达接收系统中实现主被动共用孔径,从而实现系统的小型化。

A high-efficiency beam dividing system design was accomplished, which could be used in the receiving optical system of the active-passive composite image radar to divide the active beam from the passive beam. The beam dividing system could divide the active beam with wavelength of 850 nm, view field angle of 3.5°from the passive beam with wavelength of 9.7 μm and view field angle of 6.9°. The efficiency of the beam dividing system is over 98 % for both active beam and passive beam. In addition, the structure stabilization and technical facility are the other advantages of the design. The beam dividing system design could share the same aperture for both active beam and passive beam which is important to achieve the miniaturization of active-passive composite image radar.