XMM-Newton is the second cornerstone mission of the ESA Horizon 2000 programme.Due to the excellent performance of the operations and spacecraft, and to cope with the expected long duration of the mission, it was decided to migrate the mission control system from the old SCOS-I system to the new SCOS-2000 mission control infrastructure. The paper describes how the overall objectives of the migration process have been achieved, including the preservation of the science quality, operational efficiency, system performance and external interfaces. The paper discusses the validation strategy and test approach that were driven by the needs of minimizing the impact on science operations, avoiding any disruption in the science pipeline and in the science data distribution cycle. Given the distributed nature of the control system, good coordination and maximum synergies were essential aspects of the project. The migrated system has been in operations since June 2005. This paper is presented on behalf of the SCOS-2000 Migration Team that played a fundamental role in the success of the project.
The long duration of many missions means that the cost and risk of supporting their Mission Control Systems (MCS), whose initial development may have started five years or more before launch, may increase steadily with time. This is accentuated for families of missions where each new spacecraft is based on an update of the original. Changes in the marketplace may mean that the hardware, operating system or COTS baseline for the system become obsolete. Hardware and software maintenance can become prohibitively expensive, and while freezing the MCS may seem an attractive short-term solution for reducing cost, on-board failures, or mission re-scoping, particularly near the end of life, mean extensive changes to the MCS can be required. A pre-emptive approach to managing these risks is to initiate a migration to a new state-of-the-art MCS.Under contract to the European Space Agency (ESA), LogicaCMG has helped ESA address the issue of long term MCS support by migrating several ESA operational control systems to ESA's Sun/UNIX based SCOS-2000 infrastructure, as well as several other more minor migrations involving a change of hardware platform and operating system version.This paper looks at the key issues associated with performing migrations, in particular:-what is the long term support problem, and why is there potentially a need to migrate an operational mission control system -identifying the correct approach to take for the migration -looking at the rationale for choosing ESA's SCOS-2000 infrastructure as the target platform for migration -executing the migration process -and some of the typical technical issues encountered -the final steps needed to "go live". Downloaded by 95.6.36.228 on June 21, 2016 | http://arc.aiaa.org |
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