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A. Sinn, T. Riel, P. Kremsner, G. Schitter:
"Analysis of tip-tilt compensation for reflective free-space optical satellite communication";
Vortrag: SPIE Photonics West 2019, San Francisco, California, USA; 02.02.2019 - 07.02.2019; in: "Free-Space Laser Communications XXXI", SPIE, 109101G (2019), 12 S.

Atmospheric turbulences limit the achievable performance of free-space optical (FSO) satellite communication systems. Particularly in retro-reflective FSO satellite communication, tip-tilt disturbances are a dominant source of performance degradation and thus prevent the exploitation of the full potential of this communication system.
This publication investigates the total tip-tilt error of a terrestrial optical communication platform for reflective optical communication using a 14-inch telescope with tip-tilt compensation. The compensation system consists of a fast steering mirror (FSM), a quad photo diode (QPD) and a controller. Dynamic error budgeting is used to systematically analyze the system components' interplay and their contribution to the total error. Based on the results of the system analysis, a feedback controller for the compensation system is designed and tuned for disturbance rejection. The system's performance is evaluated with a reflective FSO communication link over a distance of 600 m in urban environment. The atmospheric aberration statistic is put into relation with comparable measurements using satellite to earth communication links. Measurement results successfully demonstrate the system's performance, effectively reducing the tip-tilt error up to a factor of 10.

optical satellite communication, adaptive optics, tip-tilt compensation, dynamic error budgeting

http://dx.doi.org/10.1117/12.2506472

https://publik.tuwien.ac.at/files/publik_282538.pdf