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 59 of 350
3.6 Ground-Segment
The Sentinel-2 Ground-Segment (GS) is composed of the FOS and the PDGS. During
Phase-E1 of each satellite unit, the CNES centre in Toulouse (CNES/CST) will also be
considered an integral part of the Sentinel-2 GS as providing dedicated services on-ground
for commissioning the spacecrafts until the start of Phase-E2 operations. The specific role of
CNES/CST during commissioning phase is detailed in section 4.2.5.
The FOS is responsible for all flight operations of the Sentinel-2 spacecrafts including satellite
tasking, telecommanding and telemetry monitoring, flight dynamics monitoring and orbit
control. It will be operated at ESA’s European Space Operations Centre (ESOC) in Darmstadt
in Germany during the entire Sentinel-2 mission. FOS responsibilities are further detailed in
section 4.2.4.
The PDGS is responsible for payload and downlink planning, data acquisition and processing
of the Sentinel-2 satellite data, while contributing to the overall monitoring of the payload and
platform in coordination with the FOS. The PDGS is a distributed ground-system including
ground-stations, processing centres and embedding all additional third-party centres falling in
the scope of its responsibilities for Sentinel-2 (e.g. auxiliary data providers).
The GSCDA system is not considered part of the Sentinel-2 mission GS as providing multimission
services within the GSC and as such is not strictly dedicated to Sentinel-2.
3.7 Mission Evolution with EDRS
3.7.1 REVIEW OF EDRS PLANNED SERVICES FOR GMES
The current plan for EDRS services provisions for:
○ An initial data-relay capacity to be reached with a piggyback EDRS payload carried
on-board a non dedicated satellite to be launched in 2013,
○ A second data-relay capacity, equivalent and complementing the first one, by the
launch of an EDRS-dedicated spacecraft in 2015.
Both missions aim for a 15 years lifetime such that a dual EDRS capacity would be available
between 2015 and 2028, and a single one in the periods 2013-2015 and 2028-2030.
As stated in [RD-26], the GMES Sentinels missions are intended as one of the main
customers of EDRS services. Similarly to Sentinel-2, the Sentinel-1 spacecrafts will carry a
OCP enabling data-relay communications from space. Sentinel-3 will not carry an OCP. The
data-relay capacity will be sized to carry at least 50% of each of the Sentinel-1 and Sentinel-2
missions generated data, considering two spacecraft units operating contemporaneously for
each mission.
Besides data-relay capabilities provided as part of baseline services, the EDRS service
envelope provisions for extended services with dual objectives:
○ Repatriation services, providing a shared capacity to be used within to the GSC
Sentinels PDGSs for ground-to-ground multicast data communications, for instance to
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