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 70 of 350
operations performed, or the on-board systems unavailability
occurrences with their associated recovery operations.
• On-demand or automated extractions of HKTM data through the EGOS
Data Dissemination System (EDDS).
○ Flight dynamics monitoring and orbit-control activities will be performed through the
FOS Flight-Dynamics System component (FDS). FOS FDS operational activities are
related to PDGS ones in two main areas:
o As driving the X-Band tracking capabilities at PDGS ground-stations to enable
data reception, the FOS FDS will operationally provide the PDGS with satellite
positioning information such as the Predicted Orbit File and Two Line Elements
(TLE).
o As potentially impacting on product quality, the FOS/FDS will operationally
provide the PDGS with the plan of spacecraft manoeuvres (both in-plane and
out-of-plane), together with their resulting performance and interference.
Following each spacecraft manoeuvre, the updated satellite mass property will
be forwarded to the PDGS as required for precise orbit determination (POD)
activities.
4.2.5 CENTRE NATIONAL D’ÉTUDES SPATIALES (CNES)
To maximise the reuse of European expertise gained in the area of spaceborne high spatialresolution
optical sensors through missions such as the SPOT series, and to foster continuity
and enhancement of operational applications, ESA and CNES have signed a collaboration
agreement for the Phases C/D and E1 of the Sentinel-2 mission. This collaboration
agreement materialises at technical-level into the implementation of ESA-CNES joint teams in
the space-segment and ground-segment domains primarily focusing on the data-processing
and image-quality areas.
In this framework, CNES and more precisely the Centre Spatial de Toulouse (CST) will hold
an operational role vis-à-vis the PDGS during the commissioning phases of the Sentinel-2
spacecrafts. As forerunner to recurrent mission performance assessment activities that will be
taken over by the PDGS during the operational phase, CNES will carry out in-flight instrument
commissioning activities with counterpart tasks on ground for the validation of the processing
algorithm and PDGS processing chain.
These tasks will be driven by the Sentinel-2 Commissioning Plan (S2CP) and will be
performed through the complementary use of:
○ The Ground Processor Prototype (GPP) developed jointly by ESA/CNES and
operated at CNES/CST for the generation of Level-1 data. This algorithm to be
documented as a series of Detail Processing Models (DPM) will be the basis for the
implementation of Level 1 operational processors.
○ The Image Quality Processor (IQP) system procured and operated by CNES for the
characterisation and calibration of the sensor in-flight, and configuration and
assessment of the ground processing algorithm implemented by the GPP and the
PDGS. The GPP and PDGS processors will be jointly configured and tuned by Ground
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