15 March 2016 In-orbit verification of small optical transponder (SOTA): evaluation of satellite-to-ground laser communication links
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Abstract
Research and development of space optical communications is conducted in the National Institute of Information and Communications Technology (NICT). The NICT developed the Small Optical TrAnsponder (SOTA), which was embarked on a 50kg-class satellite and launched into a low earth orbit (LEO). The space-to-ground laser communication experiments have been conducted with the SOTA. Atmospheric turbulence causes signal fadings and becomes an issue to be solved in satellite-to-ground laser communication links. Therefore, as error-correcting functions, a Reed-Solomon (RS) code and a Low-Density Generator Matrix (LDGM) code are implemented in the communication system onboard the SOTA. In this paper, we present the in-orbit verification results of SOTA including the characteristic of the functions, the communication performance with the LDGM code via satellite-to-ground atmospheric paths, and the link budget analysis and the comparison between theoretical and experimental results.
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Hideki Takenaka, Hideki Takenaka, Yoshisada Koyama, Yoshisada Koyama, Maki Akioka, Maki Akioka, Dimitar Kolev, Dimitar Kolev, Naohiko Iwakiri, Naohiko Iwakiri, Hiroo Kunimori, Hiroo Kunimori, Alberto Carrasco-Casado, Alberto Carrasco-Casado, Yasushi Munemasa, Yasushi Munemasa, Eiji Okamoto, Eiji Okamoto, Morio Toyoshima, Morio Toyoshima, "In-orbit verification of small optical transponder (SOTA): evaluation of satellite-to-ground laser communication links", Proc. SPIE 9739, Free-Space Laser Communication and Atmospheric Propagation XXVIII, 973903 (15 March 2016); doi: 10.1117/12.2214461; https://doi.org/10.1117/12.2214461
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