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 173 of 350
4.9 PDGS Operation Layouts
This section describes potential configurations of the distributed PDGS to support end-to-end
operations. The initial layout that will be put in place for the launch of Sentinel-2A will be
settled at a later stage, building upon the layout principles presented hereafter.
All operational configurations are made of an assembly of core PDGS operational entities
including:
Core Ground Stations (CGSs) with X-Band LEO tracking and/or EDRS Ka-Band GEO
pointing capabilities responsible for acquiring the data from the Sentinel-2 satellites,
feeding the PDGS processing chains collocated at the station and distributing the data
on-line.
In principle, all data processing operations cascading from every acquisition will be
performed directly at the ground stations ensuring on-line data product distribution
directly from the station archives shortly after acquisition. Flexibility of the PDGS
distributed design will however allow for data acquisitions to be performed at remote X-
Band ground stations responsible for generating the Level-0 data and relaying it to
processing/archiving centres centralised in Europe;
Processing/Archiving Centres (PACs) in charge of either or a combination of the
following operations:
o Processing and distributing the data acquired at and relayed from remote
ground stations;
o Archiving the mission products in the mid term (typically one year) with on-line
distribution capabilities;
o Data reprocessing operations of contained scope;
o Hosted processing operations in support to third-party collaborations;
o Long-term archiving and preservation of all mission products with full
redundancy and off-line distribution capabilities. In addition, those centres will
take charge of bulk reprocessing operations over the global dataset.
An entity in charge of all QC, Cal/Val, and POD operations, interfacing the expert
Cal/Val team (possibly collocated) as required. It will also be in charge of the validation
of the instrument processors on behalf of the Reference Platform operators.
An entity in charge of PDGS system-level coordination, configuration and general
control of the mission embedding all interfaces with the FOS.
A Reference Platform in charge of PDGS system maintenance, evolutions and transfer
to operation (cf. 4.6.1).
With the exception of the X-Band ground stations which will be bound to specific geographical
locations, other entities (such as EDRS Ka-Band stations or processing/archiving entities)
may be collocated or distributed around Europe. As far as data archiving and distribution is
concerned, the advantages of a scattered physical layout with several distributed archives will
be considered. In particular, the full mission archive redundancy will be achieved by means of
a minimum of two geographically distributed entities.
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