Startical Constellation – Space-Based VHF & ADS-B ATM System

The Startical Constellation is a space-based communications and surveillance system designed to extend air traffic management (ATM) coverage globally, closing the gaps over oceanic and remote regions where terrestrial infrastructure cannot reach. It combines ADS-B surveillance with VHF voice and datalink communications between pilots and air traffic controllers, fully compliant with Safety-of-Life requirements for ATM, and is compatible with conventional avionics with no modifications required onboard.

The end-to-end system comprises a constellation of more than 200 low Earth orbit (LEO, ~650 km) small satellites specifically conceived for aviation, plus a ground segment featuring a network of ground stations, a satellite control center and dedicated service facilities. Messages are automatically routed through the relevant satellite via inter-satellite links and the integrated ground/space network, and downlinked for processing and distribution to Air Navigation Service Providers, Airline Operations Centers and other stakeholders (via ATMIC, AOC Centre, TMTC teleport and SWIM interfaces). Small satellites are cheaper and faster to build than conventional platforms, allowing the constellation to be renewed roughly every five years — far faster than the ~15-year renewal cycle of traditional ATM satellite infrastructure.

Beyond air traffic control, the system also allows Airline Operations Centers to communicate via VHF with their fleets anywhere in the world. Startical is working within ITU and ICAO frameworks toward full international standardization of space-based AMS(R)S VHF services by 2030, following the ITU World Radiocommunication Conference’s December 2023 approval of a new VHF-band allocation (117.975-137 MHz) for aeronautical mobile-satellite use from space.