中继镜系统作用效果与上行链路望远镜口径关系分析

建立了中继镜系统模型,计算了30km高度中继镜系统作用效果与上行链路望远镜口径的关系,结果显示:当望远镜口径低于0.42m时,系统作用效果随着望远镜口径增大而显著提升；在0.42～0.54m范围内,系统作用效果随着上行链路望远镜口径增大而显著降低；当望远镜口径大于0.54m时,系统作用效果随着上行链路望远镜口径的增加而增加,但增加的幅度逐步降低,当望远镜口径增加到一定大小后,系统作用效果趋向于稳定值,望远镜口径的增加对系统作用效果不具有提升作用.分析了系统作用效果在0.42～0.54m范围内出现突降的原因,计算结果显示:上行接收光束强度不均匀性导致二次光源光束质量的急剧下降,进而降低了系统作用效果.文章的计算结果为中继镜系统参数设置提供参考.

Analysis of the relationships between system damage effect and the uplink telescope aperture in a relay mirror system

Model of a relay mirror system was established,and the relationships between system damage effect and the uplink telescope aperture in a 30km-altitude relay mirror system were calculated.Results show that,with the increase of the uplink telescope aperture,the system damage effect increases significantly when the uplink telescope aperture is less than 0.42m;the system damage effect decreases sharply when the uplink telescope aperture is in 0.42-0.54m;the system damage effect increases when the uplink telescope aperture is greater than 0.54m,while gradient of the increasing reduces;the system damage effect tends to be a stable value when the telescope aperture is greater than a certain size.Reasons for the steep fall in 0.42-0.54m are analyzed,and it is demonstrated that the intensity non-uniformity of the received beam causes the reduction of the new source beam quality and the steep fall of the system damage effect.The results of the study can provide reference for the relay mirror system.