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 151 of 350
Three types of physical data transportation means will be supported for internal datacirculation
providing for trade-off:
○ Ground network, considering that ground-lines supporting a throughput of up to about
100Mbps will be available at reasonable operation costs in the 2013 timeframe.
○ Satellite multicast via the EDRS data-repatriation transponders, considering the
availability of the shared EDRS data-repatriation capability with 220Mbps throughput
for a third of the total time (cf. [Assumption-13]);
○ Media such as LTO tapes or USB devices (e.g. removable hard disks);
Circulation via physical media is currently accounted for as a trade-off solution to
ensure cost-effectiveness of the global circulation required as not requiring stringent
timeliness whilst potentially providing for higher effective throughput at lower operation
costs. To guarantee operational effectiveness of this process, media loading, release
and labelling operations will be mechanical and the physical flow of media will be
controlled modelling an automated transportation network.
4.5.4.10 Cal/Val Operations
Cal/Val corresponds to the process of updating and validating on-board and on-ground
configuration parameters to ensure that the product data quality requirements are met.
To meet the baseline product quality requirements later defined in section 4.4.4, a welldefined
Calibration and Validation (Cal/Val) plan will be systematically applied. This section
presents an outline of the Cal/Val plan that will be implemented during Phase E2 of each
spacecraft. During Phase-E1, a dedicated Cal/Val plan will be specified as part of the
Commissioning-Plan.
The following paragraphs define each of the Cal/Val operations specific to Level-1 and Level-
2 data. Level-1 Cal/Val operations are divided between Radiometry and Geometry
operations.
Each one is described with a short outline of the method and details whether it will be carried
out automatically by PDGS computer systems, through an operational service offered by an
expert Cal/Val team, or by a hybrid semi-automatic combination.
4.5.4.10.1 MSI Decontamination
The purpose of the decontamination operation is to get rid of the molecular contaminant on
the MSI SWIR focal plane. The MSI decontamination operation consists in heating the SWIR
focal plane from the nominal operating temperature (around 200 K) to the decontamination
temperature (around 300 K).
The typical expected duration of the decontamination operation is approximately 48 hours (cf.
[RD-43]); the periodicity is once every six months. During the decontamination operation, the
MSI nominal operations are interrupted.
The programming of the MSI decontamination will be commanded by a Flight Control
Procedure starting with the Instrument from STANDBY, CSM being commanded to open
position and applying decontamination heater power for a time period as needed, typically 48
hours (cf. [AD-03]).
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