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Free Space Optical Communication Flight Mission: Simulations and experimental results on ground level demonstrator

机译：自由空间光通信飞行任务：地面示范器的模拟和实验结果

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In the context of the increasing demand in high-speed data link for scientific, planetary exploration and earth observation missions, the Italian Space Agency (ASI), involving Thales Alenia Space as prime, the Polytechnic of Turin and other Italian partners, is developing a program for feasibility demonstration of optical communication system with the goal of a prototype flight mission in the next future. We have designed and analyzed a ground level bidirectional Free Space Optical Communication (FSOC) Breadboard at 2. 5Gbit/s working at 1550nm as an emulator of slant path link. The breadboard is full-working and we tested it back-toback, at 500m and 2.3km during one month. The distances were chosen in order to get an equivalent slant path cumulative turbulence in a ground level link. The measurements campaign was done during the day and the night time and under several weather conditions, from sunny, rainy or windy. So we could work under very different turbulence conditions from weak to strong turbulence. We measured the scintillation both, on-axis and off-axis by introducing known misalignments at the terminals, transmission losses at both path lengths and BER at both receivers. We present simulations results considering slant and ground level links, where we took into account the atmospheric effects; scintillation, beam spread, beam wander and fade probability, and comparing them with the ground level experimental results, we find a good agreement between them. Finally we discuss the results obtained in the experimentation and in the flight mission simulations in order to apply our experimental results in the next project phases.
机译：在对科学，行星勘探和地球观测特派团的高速数据链路的需求日益增长的背景下，意大利空间机构（ASI），涉及麦林和其他意大利合作伙伴的Proime作为素质，正在开发光通信系统可行性示范计划，目的是下一代未来的原型飞行使命。我们已经设计和分析了2级双向自由空间光通信（FSOC）面包板，在2. 550nm工作为倾斜路径链路的仿真器。面包板是全功工作的，我们在一个月内以500米和2.3km在500米和2.3km中测试了它的反馈。选择距离以便在地面链路中获得等效的倾斜路径累积湍流。测量活动是在白天和夜间和几个天气条件下完成的，从阳光明媚，多雨或刮风。因此，我们可以在非常不同的湍流条件下工作，从弱到强大的湍流。通过在终端在终端引入已知的错位，在两个接收器处，通过在终端的已知的错位中引入轴和轴线和离轴来测量闪烁。我们展示了考虑倾斜和地面环节的模拟结果，我们考虑到大气效果;闪烁，光束传播，光束徘徊和褪色概率，并将其与地面实验结果进行比较，我们在它们之间找到了良好的一致性。最后，我们讨论了在实验和飞行任务模拟中获得的结果，以便在下一个项目阶段应用我们的实验结果。

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