GSC Sentinel-2 PDGS OCD - Emits - ESA

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GSC Sentinel-2 PDGS OCD Issue 1 Revision 2 (draft) - 25.07.2010 GMES-GSEG-EOPG-TN-09-0008 page 202 of 350 5.2.2.2 System Control Functions 5.2.2.2.1 Core Objective As primary goal, the System Control functions aim at providing the necessary means to control, monitor, assess, and fine tune the PDGS towards its goals and to mature its evolutions. 5.2.2.2.2 Design Drivers The main drivers shared by system-control functions are mostly driven by the Mission- Support services characteristics including the baseline requirements for system evolutions defined in section 4.6 and extensions through third-party collaborations as described in 4.10.2. Associated drivers are highlighted such as: ○ The reliability of service for the accurate management of the overall system configuration according to the HLOP and its derived plans and throughout mission phase changes; ○ The operational reliability, availability, maintainability of all PDGS services versus their stakeholders such as the FOS and downstream data consumers, including during specific phase-in activities of new spacecraft units or EDRS. ○ The well-controlled performance of the PDGS, the FOS and the space-segment vis-àvis the availability, timeliness and quality of all products delivered and of the mission as a whole; ○ The operational assessment and monitoring of the PDGS sub-systems functioning and performance in operations following well-defined procedures for anomaly management, preventive maintenance and corrective maintenance; ○ The long-term outlook of the PDGS services within the GSC in terms of flexibility and evolution capability it will be required to cover; ○ The long-term sustainability of PDGS operations. On a functional design point of view, the following drivers and constraints are highlighted: ○ To support the POM in its responsibilities (cf. section 4.2.1) the PDGS design shall feature a well-defined mission-control-loop directly responding to the services described in section 4.10.3 in providing the appropriate leverages on the main PDGS configurable elements systematically complemented by feedback visibility and measures on the associated performance. ○ Taking advantage of the systematic and near-deterministic nature of the Sentinel-2 data-acquisition plan, the mission planning and mission performance assessment and control activities aims for a near-autonomous and automated behaviour to the maximum feasible extent; ○ The required long-term operational sustainability of the PDGS operations imposes a high-level of maturity to all system-management activities following well-defined procedures supported by widely used system management tools embedding computer-based automation when relevant; ESA UNCLASSIFIED – For Official Use © ESA The copyright of this document is the property of ESA. It is supplied in confidence and shall not be reproduced, copied or communicated to any third party without written permission from ESA.
GSC Sentinel-2 PDGS OCD Issue 1 Revision 2 (draft) - 25.07.2010 GMES-GSEG-EOPG-TN-09-0008 page 203 of 350 ○ The Sentinel-2 spacecrafts and in particular the MSI instrument featuring leading-edge technology coupled with the stiff requirements imposed on the accuracy of the final products impose that a certain number of critical tasks are assumed interactively by experts teams rather than fully automated in particular in the MSI performance and product quality control areas; ○ The gradual phase-in of spacecrafts in the constellation as well as EDRS during operations imposes strict configuration control mechanisms for the accurate management of the software, hardware and of the overall PDGS configuration especially during the transitory phases separating operational scenarios. It also imposes that the PDGS functions are designed with multi-spacecraft embedded features since the beginning allowing to clearly discriminating the PDGS configuration applicable to each spacecraft on a logical point of view; ○ Lessons learnt coupled with the long-term outlook of the Sentinel-2 mission imposes that the planning capabilities be flexible and include room for evolutions with respect to the strict baseline defined at present; ○ The non a-priori knowledge of the EDRS OCP exploitation methods and constraints at the time of design imposes additional flexibility in the mission planning element to allow for a swift and optimal assimilation of EDRS capabilities when they will be better defined and/or measured; ○ The cross dependencies between the LGS downlink opportunities and the nominal data recovery plan to the CGS network impose that the mission planning capabilities allow for optimising the direct-downlink opportunities to LGS throughout the mission plan within the constraints settled for the nominal mission; ○ The fostering and effective implementation of collaborative PDGS opportunities will impose that specific technical support is provided towards the peer entities with mission management feedback to guarantee the appropriate definitions and successes of the collaborations. 5.2.2.2.3 Breakdown Derived from the above considerations, the functional breakdown regarding system-control functions is depicted on Figure 5-2. ESA UNCLASSIFIED – For Official Use © ESA The copyright of this document is the property of ESA. It is supplied in confidence and shall not be reproduced, copied or communicated to any third party without written permission from ESA.
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GSC Sentinel-2 PDGS OCD - Emits - ESA

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