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 74 of 350
For Sentinel-2B and future replacement units, the CP will cover S2CP requirements and
coordinate the overall PDGS operations considering its operational state within the GSC
versus the satellites in the operational constellation.
EDRS data-repatriation and dissemination system interfaces will be commissioned separately
when the respective EDRS capabilities are available.
As applied to the spacecraft under commissioning, it is anticipated that the PDGS operations
cascading from S2CP will require in particular:
○ A fast planning and re-planning loop with the FOS to schedule the spacecraft
according to the plan and deviations from the plan in case of contingencies;
○ The operational supply of Level-0 and Level-1 data-products to the CNES/CST to carry
out instrument in-flight characterisation and calibration;
○ The operational supply of X-Band HKTM data to the FOS;
○ The coordination of payload and ground processor configuration changes from CNES
input, associated configuration control and upload as required to the satellite via the
FOS nominal interface;
○ The coordination with the EDRS exploitation segment for the effective planning of data
downlinks via the OCP and the EDRS data-relay transponder;
○ The independent assessment of the mission performance.
4.3.2.2 Mission Evolutions
4.3.2.2.1 Spacecraft Phase-in
The Sentinel-2 mission program includes the gradual phase-in of spacecraft units in the
constellation, starting with the launch of Sentinel-2B 18-30 months after Sentinel-2A
[Assumption-03], and subsequently followed by the recurrent launches of replacement units.
This imposes a number of constraints to sustain the operational services particularly at the
transitory phases from the launch of a new spacecraft until its successful commissioning in
operations.
4.3.2.2.2 EDRS Phase-in
The GMES Sentinels program includes the future complementary usage of the EDRS
capacities (cf. section 3.7) starting in the 2013 timeframe as from the current plan. This
planned rendezvous, although coinciding well in time with the availability of Sentinel-2A does
not lead to setting-off the Sentinel-2 operational services with EDRS, and an X-Band only
CGS network is taken as baseline.
This programmatic constraint imposes that the PDGS operation concepts are designed with
embedded flexibility and scalability to be able to swiftly accommodate the substantial
enhancements brought in by EDRS for data relay, multicast repatriation and broadcast
dissemination capabilities in the future operation baseline (cf. [RD-47]). It also imposes that
the PDGS operations account for a significant operation baseline change while the PDGS is
already providing its operational services based on the initial baseline.
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