临近空间相干激光通信链路外差效率分析  

Analysis of heterodyne efficiency of near earth coherent laser communication links

作　　者：张鹏[1] 秦开宇[1] 蒋大钢[1] 邓科[1] 幺周石[2] 

机构地区：[1]电子科技大学航空航天学院,成都611731 [2]中国空间技术研究院西安分院研发中心,西安710100

出　　处：《强激光与粒子束》2015年第4期31-35,共5页High Power Laser and Particle Beams

基　　金：国家自然科学基金项目(61205122;61405023;11474048);中国科学院自适应光学重点实验室基金项目(LAOF101304)

摘　　要：临近空间相干激光通信链路是天地一体化高速通信网络节点间连接的重要链路。围绕外差效率这一表征大气湍流扰动后信号光和本振光相干合成的指标,推导了非均匀湍流路径上的外差效率理论表达式,并结合大气折射率结构常数廓线,开展了临近空间-地面、临近空间-临近空间和临近空间-低轨卫星三类临近空间相干激光通信链路的外差效率仿真。仿真结果表明:临近空间-低轨卫星链路可以忽略大气对外差效率的影响;如果临近空间-临近空间链路距离大于500km或是临近空间-地面链路天顶角大于60°,外差效率将小于50%,有必要采用自适应光学技术进行补偿。Coherent laser communication links of near space are important links of the integrated sky-earth high speed communication networks.This research focused on the heterodyne efficiency which represents coherent index of local laser and signal laser influenced by the atmospheric turbulence.The theoretical heterodyne efficiency expression with the path influenced by nonhomogeneous turbulence was derived.The simulations of heterodyne efficiency of near space-earth,near space-near space and near space-low orbit satellite coherent laser communications links were given.The simulation results show that the atmospheric turbulence effect of near space-low orbit satellite links can be neglected.If the link distance between near space-near space is greater than 500 km or the zenith angle of near space to ground link is greater than 600 degrees,the heterodyne efficiency will be less than50% and it is necessary to compensate the effect of atmospheric turbulence by using of adaptive optics.

关 键 词：外差效率 相干 激光通信 大气湍流 

分 类 号：V274[航空宇航科学与技术—飞行器设计]