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Toward the uplink correction: application of adaptive optics techniques on free-space optical communications through the atmosphere

机译：迈向上行链路校正：自适应光学技术在大气自由空间光通信中的应用

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摘要

The optical ground station (OGS), installed in the Teide Observatory since 1995, was built as part of ESA efforts in the research field of satellite optical communications to test laser telecommunication terminals on board of satellites in Low Earth Orbit and Geostationary Orbit. As far as one side of the link is settled on the Earth, the laser beam (either on the uplink or on the downlink) has to bear with the atmospheric turbulence. Within the framework of designing an adaptive optics system to improve the performance of the free-space optical communications at the OGS, turbulence conditions regarding uplink and downlink have been simulated within the object-oriented matlab adaptive optics toolbox as well as the possible utilization of a laser guide star to measure the wavefront in this context to cope with the angular difference in uplink and downlink beams due to the point-ahead angle required for the uplink. Simulations have been carried out by reducing available atmospheric profiles regarding both night-time and day-time measurements and by having into account possible seasonal changes. An AO proposal to reduce atmospheric aberrations and, therefore, ameliorate FSO links performance is presented and analyzed in this paper.
机译：自1995年以来一直安装在泰德天文台的光学地面站（OGS），是欧空局在卫星光通信研究领域努力的一部分，目的是测试低地球轨道和对地静止轨道卫星上的激光电信终端。只要链路的一侧固定在地球上，激光束（无论是在上行链路还是下行链路）都必须承受大气湍流。在设计自适应光学系统以提高OGS处的自由空间光通信性能的框架内，已经在面向对象的Matlab自适应光学工具箱中模拟了有关上行链路和下行链路的湍流条件，以及可能的利用激光导星在这种情况下测量波前，以应对由于上行链路所需的指向角而导致的上行链路和下行链路光束的角度差异。通过减少有关夜间和白天测量的可用大气剖面并考虑到可能的季节变化来进行模拟。本文提出并分析了一种减少大气像差，从而改善FSO链路性能的AO提议。

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