中文题目: 星地相干光通信中的自适应光学系统带宽研究
外文题目: Bandwidth of Adaptive Optics System in Satellite-Ground Coherent Laser Communication
作者: 李佳蔚; 陈卫标
刊名: 中国激光
年: 2016 卷: 43 期: 8 页： 806003
中文关键词:
光通信; 自适应光学; 大气湍流; 控制带宽; 混频效率
英文关键词:

optics communications; adaptive optics; atmospheric turbulence; servo bandwidth; mixing efficiency
中文摘要:
针对星地相干激光通信,研究了自适应光学的系统带宽对通信性能的影响。对于特定校正阶数的自适应光学系统,得到了系统需求的控制带宽,并对比了同步轨道(GEO)卫星对地链路和低地轨道(LEO)卫星对地链路。结果显示低轨卫星链路所需的控制带宽远大于同步卫星链路,原因来自于低轨卫星和地面站的高速相对运动产生的垂直链路风速,同时低轨卫星对地链路对自适应光学的带宽需求和天顶角是成反比关系的。分析了低轨卫星对地相干激光通信链路混频效率和自适应系统带宽以及校正阶数的关系,结果表明,200 Hz的闭环带宽完全可以满足需求,当达

英文摘要:
The influence of system bandwidth of adaptive optics system to communication performance is investigated for satellite-ground coherent opticscommunication. For a certain modes corrected by adaptive optics, the required servo bandwidth is obtained and the low earth orbit (LEO) satellite-ground laser links are compared with the geosynchronous (GEO) satellite-ground laser links. The results show that the LEO links require larger servo bandwidth than the GEO links. This is due to the high speed relative movement between the LEO and the ground station can generate vertical wind speed link. And the bandwidth requirement of adaptive optics system for LEO-ground link and zenith angle are inversely related. The relationship between the mixing efficiency LEO-ground coherent laser communication link, the adaptive optics system servo bandwidth and corrected modes is also studied. The results show that 200 Hz of close-loop bandwidth can meet the requirement, and increasing the number of actuators on deformable mirror is a more effective way to improve the mixing efficiency when the bandwidth reaches 100 Hz.


文献类型: 期刊论文
正文语种: Chinese
收录类别: CSCDEI
DOI: 10.3788/CJL201643.0806003


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