system aspects of optical LEO-to-ground links

D. Giggenbach; A. Shrestha; C. Fuchs; C. Schmidt; F. Moll

doi:10.1117/12.2296054

25 September 2017 system aspects of optical LEO-to-ground links

D. Giggenbach, A. Shrestha, C. Fuchs, C. Schmidt, F. Moll

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Proceedings Volume 10562, International Conference on Space Optics — ICSO 2016; 105625N (2017) https://doi.org/10.1117/12.2296054
Event: International Conference on Space Optics — ICSO 2016, 2016, Biarritz, France

Abstract

Optical Direct-to-Ground data links for earth-observation satellites will offer channel rates of several Gbps, together with low transmit powers and small terminal mass and also rather small ground receiver antennas. The avoidance of any signal spectrum limitation issues might be the most important advantage versus classical RF-technology. The effects of optical atmospheric signal attenuation, and the fast signal fluctuations induced by atmospheric index-of-refraction turbulence and sporadic miss-pointing-fading, require the use of adaptive signal formats together with fading mitigation techniques. We describe the typical downlink scenario, introduce the four different modes of data rate variation, and evaluate different methods of rate-adaptive modulation formats and repetition coding techniques.

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D. Giggenbach, A. Shrestha, C. Fuchs, C. Schmidt, and F. Moll "system aspects of optical LEO-to-ground links", Proc. SPIE 10562, International Conference on Space Optics — ICSO 2016, 105625N (25 September 2017); https://doi.org/10.1117/12.2296054

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KEYWORDS

Receivers

Satellites

Signal attenuation

Atmospheric optics

Modulation

Scintillation

Astronomical imaging

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