GSC Sentinel-2 PDGS OCD - Emits - ESA

GSC Sentinel-2 PDGS OCD
Issue 1 Revision 2 (draft) - 25.07.2010
GMES-GSEG-EOPG-TN-09-0008
page 165 of 350
○ A PDGS deployed configuration with a hybrid state starting at the time the PDGS
infrastructure is upgraded from a single mission sizing to its final sizing required to
support the constellation. From this event onwards, the PDGS assumes nominal
operations for Sentinel-2A while tests are carried out in parallel to prepare for
readiness of Sentinel-2B operational phase-in;
○ A PDGS configuration reaching the validation state for the Sentinel-2A/B constellation
only after the completion of OSVs applicable to Sentinel-2B;
○ A PDGS configuration with full functionality vis-à-vis the GSC for the Sentinel-2A/B
constellation after successful Sentinel-2B commissioning.
The hybrid-state PDGS configuration immediately following its full-size reconfiguration to
support Sentinel-2B preparatory activities will be the critical step of this scenario. It will
impose:
○ A careful configuration of all Data-Access elements of the PDGS so that user access is
not spoilt by the testing activity performed on the Sentinel-2B specific dataflow.
○ A careful configuration of the PDGS mission-planning elements, in particular vis-à-vis
the FOS, so that the mission planning function continues operating nominally for
Sentinel-2A independently from Sentinel-2B test planning;
○ A thorough pre-configuration and validation on the RP of new infrastructure elements
shared between Sentinel-2A and Sentinel-2B before deployment in operations;
○ Specific functional, interface and reliability requirements at system and sub-system
level as appropriate to ensure conflict-free Sentinel-2A and Sentinel-2B mission
dataflows within the PDGS;
○ Well-defined operational procedures dedicated to this phase-in scenario, validated and
rehearsed initially as part of the pre-Sentinel-2A launch PDGS IV&V activity.
4.6.5 EDRS PHASE-IN
The launch of the EDRS piggyback payload is currently planned in the 2013 timeframe,
hence in the same timeframe as the Sentinel-2A launch and start of operations. At this stage,
it is however not foreseen to commission Sentinel-2A together with EDRS within the short
time allocated for commissioning. Hence, unless EDRS is launched and commissioned wellbefore
Sentinel-2, the approach described here foresees as general case an EDRS
operational phase-in while Sentinel-2A is already in operations.
The phase-in of EDRS imposes at term a drastic change to the mission operation scenario
due to the reshaping of the CGS network required from the strict X-Band scenario. It is hence
expected that a commissioning period of Sentinel-2 with EDRS will be required in parallel to
the Sentinel-2A operational service before this change is effectively carried out.
This paragraph describes the resulting two-step phase-in approach.
4.6.5.1 Commissioning of EDRS Capabilities with Sentinel-2
As described in 3.7.2, the Sentinel-2 PDGS foresees the use of EDRS capabilities at three
levels, being the data-relay, data repatriation and data-dissemination. As the latter is
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