Site diversity considerations for high capacity optical networks in low Earth orbit

Paul Shubert; Jim McNally

doi:10.1117/12.2578651

10 March 2021 Site diversity considerations for high capacity optical networks in low Earth orbit

Paul Shubert, Jim McNally

Proceedings Volume 11678, Free-Space Laser Communications XXXIII; 1167810 (2021) https://doi.org/10.1117/12.2578651
Event: SPIE LASE, 2021, Online Only

Abstract

Optical space data relay systems will require Terabit per second (Tbps) capacities to match or exceed RF communication capabilities. A previous study1 has shown that implementing these high-capacity optical feeder links through a traditional geostationary constellation will pose significant development challenges. Meshed satellite constellations in low earth orbit (LEO), operating at significantly shorter ranges, were shown to have the potential to support Tbps feeder links using the technical capabilities of current free-space optical communication systems. Meshed LEO constellations, however, provide unique challenges, including complex constellation maintenance, dynamic meshing and data routing, and short contact periods with ground stations. We evaluate constellation geometries and ground station sites to establish minimum system requirements to maintain space-to-ground feeder links for a meshed LEO constellation. System requirements include site diversity and redundancy to compensate for local weather. We examine historical weather data to test the conclusions of the constellation and site diversity evaluation. Simulations of data collection and transfer through meshed LEO constellations and space-to-ground feeder links are performed.

Conference Presentation

Citation Download Citation

Paul Shubert and Jim McNally "Site diversity considerations for high capacity optical networks in low Earth orbit", Proc. SPIE 11678, Free-Space Laser Communications XXXIII, 1167810 (10 March 2021); https://doi.org/10.1117/12.2578651

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