Galileo Constellation Operations Simulator

The Galileo Constellation Simulator (CSIM) will be used to support the operations preparation, training and ground segment validation for the Galileo constellation. CSIM is required to support the initial In-Orbit Validation (IOV) constellation (4 spacecraft) and the full evolution of the constellation for the planned 20 year lifetime. This means it has to be scalable to support the simultaneous simulation of up to 6 spacecraft with high-fidelity onboard processor emulations, plus up to 45 spacecraft simulated at a lower fidelity (to cover replenishment and in-orbit spares, as well as the nominal constellation). It will also support up to 5 different ground stations supporting concurrent telecommand and telemetry links to up to 5 spacecraft at any one time. This scalability brings unique challenges to the design, development and end-use of CSIM.