Telesat Lightspeed: enabling mesh network solutions for managed data service flexibility across the globe

Abstract

Rapid increases in global broadband demand are driving advanced commercial Low Earth Orbit (LEO) satellite communications systems that can deliver global broadband capacity at terrestrial level costs and performance. Flight demonstration programs such as the Defense Advanced Research Projects Agency (DARPA) “Blackjack” program are exploring the utility of Optical Inter-Satellite Links (OISLs) for these new LEO systems. For global communications, LEO systems, such as that being developed by Telesat, provide unprecedented broadband capabilities. Telesat’s new LEO system, Telesat Lightspeed, will deliver very low latency, fiber-like mesh connectivity via OISLs, increasing the capabilities for data dissemination and delivery across the globe. The ability for a User Terminal (UT) to opt to reach back without the need for anchor relay stations through multiple OISL hops between communication satellites, provides secure and resilient connectivity. Global (including the polar) connectivity, at fiber-like speeds, provides a dramatic change to high-capacity data distribution and dissemination while delivering robust reliable and trusted information. This paper will provide an architectural overview of the Telesat Lightspeed mesh network interfaces, including OISL spacecraft-to-spacecraft relay connectivity, as well as the integration of User Terminals, landing stations, satellite operations centers, and network operations centers. Satellites operating in both polar and inclined orbit planes and cutting-edge technologies, including phased array antennas, onboard data processing and OISLs, enable pole-to-pole global coverage, along with the ability to concentrate capacity in areas where it is most needed to maximize network efficiency and achieve superior unit cost economics. We identify and address challenges associated with operating OISLs including acquisition, tracking, tasking, efficient data routing, and managing network data. Lastly, we present enabling standards and technologies that enhance network flexibility, interoperability and identify areas of future capability development.