野战激光通信中多口径发射与大口径接收试验研究

针对野战无线激光通信中大气衰减和光强起伏问题，分析了大气对激光通信的影响，探讨了多口径发射与大口径接收对大气影响抑制机理，在此基础上，构建了多口径发射和大口径接收试验装置，发射端发射孔径数目可调，接收端光学天线采用卡塞格伦结构，通过在光学天线前面增加不同口径光阑方式，改变天线口径。发射孔径数目增加到4束时，光强起伏方差约为单光束时的1/2,接收口径直径相差1.5倍时，闪烁方差之间相差1.6倍，验证了对大气湍流的抑制效果。根据理论分析与试验结果，对野战激光通信光端机的部分参数进行了优化设计。

Multi-caliber-launching and large-caliber-receiving techniques for field atmospheric laser communication

Aiming at the problem of atmospheric attenuation and intensity fluctuation of the field operations wireless laser communication, the effect of atmosphere on laser communications was analyzed, the suppressing mechanism of the atmosphere adverse effects using multi-caliber-launching and large-caliber receiving was explored on laser communication. A multi-caliber-launching and large-caliber-receiving test device was built. The number of emission caliber was adjustable on emission end, and the Cassegrain structure was used in optical antenna on receiving end. The antenna caliber could be changed by adding different calibers apertures in front of optical antenna. When the number of emission caliber was increased to 4 beams, the value of light intensity fluctuation variance was about 1/2 of the single beam. And with the receiving aperture diameter difference of 1.5 times, there was a 1.6 times difference between scintillation variance. The multi-caliber-launching and large-caliber-receiving inhibitory effect of atmospheric turbulence was validated by experiments. According to the test results, some parameters of laser communication terminal of were optimized.