Celestia Satellite Test & Simulation BV (C-STS) provides innovative high-tech solutions for ground-based systems in the domains of satellite simulation and testing as well as modem (satellite communication) and data processing systems. These systems are predominantly used in either in clean room/AIT environments using direct connections to spacecraft equipment for verification and test purposes or in ground stations for communication with the spacecraft through an antenna connection for data uplink transmission and/or data downlink reception.