GSC Sentinel-2 PDGS OCD - Emits - ESA

ESA UNCLASSIFIED – For Official Use
GSC Sentinel-2 PDGS OCD
Issue 1 Revision 2 (draft) - 25.07.2010
GMES-GSEG-EOPG-TN-09-0008
page 265 of 350
the on-ground POD products generated (i.e. Predicted and Restituted POD products), which
are relevant to the MSI processing activities according to the mission requirements in terms of
geometric accuracy.
6.7.2 OPERATION CONSTRAINTS
The following operation constraints are identified:
○ POD function operations rely on adequate GNSS measurements and cannot be
intended to generate orbit products in case of unavailability of the on-board GNSS
receiver.
○ POD activities result from an estimation process of an adequate GNSS measurements
datasets that determine the position and the velocity of the Sentinel-2 satellite centre of
mass. Depending on the parameterization needed for the required accuracy of the
orbit determination, potential data gaps in the GNSS data may degrade the
performance (typically when duration achieves a quarter of an orbit). Therefore
significant GNSS data gaps due will result in the generation of degraded POD products
or not generation at all depending on the gaps length.
6.7.3 OPERATION SCENARIOS
6.7.3.1 POD Configuration
This scenario accounts for the operator-driven configuration of the Precise Orbit
Determination function. The POD configuration includes amongst others required input files
definition, auxiliary data provider interfaces definition, processing rules definition, etc.
The following configuration steps can be performed in support of the other operation
scenarios:
1) Define and configure the different interfaces for inputs management (e.g. definition of
the interfaces for the GPS clocks & orbits data gathering);
2) Define the POD products generation rules by configuration of used input file-types,
generation method (scheduled / data-driven), GNSS data gaps management, etc;
3) Configure the analysis and reporting of the
The use case of this operation scenario is the configuration of the different tasks performed
by the POD function such as:
Auxiliary inputs management. This is the definition of the interfaces plus applicable
products gathered.
Sentinel-2 predicted POD product generation configuration performed by definition of
the triggering mode (scheduled or data-driven), inputs type, coverage, timeliness, etc.
Sentinel-2 restituted POD product generation configuration performed by definition of
the triggering mode (scheduled or data-driven), inputs type, coverage, timeliness, etc.
Configuration of the on-board navigation and POD products reports by definition of the
generation frequency, definition of the contents, delivery method, etc.
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