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## Research and development approach to realize flexible opticalground network operations for effective data downlink from space to ground

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Advances in Communications Satellite Systems Proceedings of The 36th International Communications Satellite Systems Conference (ICSSC-2018) — Recommend this title to your library

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The application of optical communications technology for intersatellite and direct links is increasing in the fields of remote sensing and space explorations. Optical communication experiments have been conducted internationally and there are plans to use related technologies for space operations. However, there are not many experiments or plans for the network of optical ground stations focused on the particular issue of how to avoid cloud blocking in optical links between space and the ground for effective data downlink. In 2015, JAXA reported on a future experimental plan for optical direct communication links from space to ground in order to acquire the fundamental technologies of spatial pointing and tracking with the International Space Station and the experimental concept for the avoidance of cloud blockings by optical ground stations, cloud sensors and network planning systems [3]. To forward the study on flexible optical ground network operations, JAXA began joint research with Tokai University in 2017 and has studied more specific experiment method with ground fiber networks, cloud sensors, network planning systems and meteorological satellite data. This paper presents the research and development approach to realize flexible optical ground network operations for effective data downlink from space to ground.

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