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ObjectiveThe Avionics System Test Bench (ATB) is a facility initiated by and located at ESTEC, with the scope of providing the tools and methods for supporting the validation in context of a realistic closed-loop Attitude and Orbit Control System (AOCS) of a typical earth observation satellite. Parts of the ATB were previously known as Virtual Spacecraft Reference Facility (VSRF).
ContextThe ATB project defines an evolutionary approach to achieve a reusable simulator system. The facility consists of the following configurations, reflecting increasing levels of sophistication in the modelling, and finally in the inclusion of an on-board computer breadboard in the realtime test bench:
Role of EuroSimThe ATB is utilizing EuroSim as the real-time simulation platform in all configurations, apart from the AFS which uses Matlab/Simulink for the modelling. The Real-Time Test-Bench (RTB) supports closed loop execution of the avionics models with the On-Board Computer in the loop and is the most demanding configuration; its high-level architecture is depicted on the left. EuroSim was selected as it is designed to support projects throughout the project life-cyle, including the closed loop simulations with hardware-in-the-loop that occur during Design, Development and Test. The add-on tool MOSAIC was used to transform Matlab/Simulink models into real-time EuroSim models, and the Airbus Defence and Space AIM Mil1553 real-time driver was used to connect the simulator to the MIL1553 bus with the on board computer. Visualisation is provided using the EuroSim add-on OpenIGS, and facility operation is supported using SCOS2000.
More informationFor more information on the ATB, please vist the ESA site Avionics Test Bench page on the ESA website