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For many years now simulation techniques have been used with great success to support different aspects of a typical satellite mission. However, over recent years the use of simulation and simulators has changed within European space industry -it has become an integral part of the engineering lifecycle and processes followed internally by the satellite Primes, and as captured in the ECSS-E-TM-10-21A [1]. The use of individual simulators and test-benches has moved towards configurable simulator systems fulfilling multiple roles and usecases across the engineering lifecycle.The topic of models re-use is still a key driver within the simulator domain. This has led to the creation of the new SMP2 standard following on from the original SMP standard, and the initiation of several ESA projects defining simulator reference architectures. In terms of model development and integration, there has been a move towards integrated modeling environments supporting the complete model/simulator lifecycle.This paper presents some of the recent trends in the application of simulation to the satellite mission lifecycle, the motivation behind these trends, and the transition from company/organization-specific approaches to the creation of more industry-wide standards.

ATB is a software simulation framework modeling orbital and spacecraft dynamics, environment, and Attitude and Orbit Control System (AOCS) sensors and actuators. It is an ideal tool for organizations wanting to increase their awareness and knowledge of satellite AOCS closed loop systems. It includes closed-loop functional control models which utilize the sensor and actuator software models, and is an excellent starting point for system concept analysis, and attitude and orbit control algorithm development. This paper introduces ATB, describes some of its features, latest developments of the software and concludes with a discussion of its multiple potential uses.

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