GSC Sentinel-2 PDGS SRD - emits - ESA

GSC Sentinel-2 PDGS SRD
Issue 1 Revision 2 (draft) - 25.07.2010
GMES-GSEG-EOPG-RD-09-0028
page 35 of 204
4 ASSUMPTIONS & OPEN ISSUES
4.1 Assumptions
High-level assumptions taken and having an impact on the settled PDGS operation
baseline are enumerated hereafter.
[Assumption-01] The Sentinel-2B satellite will be identical to Sentinel-2A satellite.
[Assumption-02] Seven (7) years of active mission operations plus a possible 5 years
extension are considered for each Sentinel-2 satellite.
[Assumption-03] Sentinel-2B will be launched 18-30 months after Sentinel-2A. 18
months is the planned value (TBC) at Sentinel-2 GS PDR.
[Assumption-04] 5.5 to 10.5 years of parallel Sentinel-2A and Sentinel-2B active mission
operations (nominal or extended mission duration) plus 18 months
Sentinel-2B active mission operations are envisaged.
[Assumption-05] Twenty-Five (25) years of mission operations from archive are
considered.
[Assumption-06] The X/Ka-band ground stations network will be selected at a later
stage. A minimum four X-band receiving PDGS Core Ground Stations
baseline scenario is assumed in this document. This configuration is
sufficient to downlink the Sentinel-2 data as per baseline scenario. The
selection of more stations will substantially enhance the performance
of the baseline scenario but is not strictly required for baseline
operations.
[Assumption-07] All data handled by the Sentinel-2 PDGS is assumed to be
UNCLASSIFIED (according to [RD-13]).
[Assumption-08] Sentinel-2 X-Band data will not be encrypted (according to the GSC
Security Work Group Meeting #4, held on 30.01.2008, GM-MN-ESA-
SY-0015)
[Assumption-09] It will be possible to use the EDRS Programme capacity to support
both the Sentinel-2 payload data downlink (data relay function), as well
as PDGS data circulation and dissemination activities.
[Assumption-10] EDRS capabilities and services will be preliminarily validated as part of
EDRS commissioning activities which will be carried out by the EDRS
program in coordination with the Sentinel programs. Those activities
will make use an EDRS provided validation framework on ground that
will not require specific PDGS hardware or pre-deployed facilities apart
from a front-end reception equipment to perform compatibility testing of
the data-relay multicast link.
[Assumption-11] The OCP will, when activated in alternative or in parallel to the XBS,
transparently carries the dual 280Mbps downlink channels via the GEO
transponders, in turn relaying in real-time the data stream in Ka-Band
to GEO pointing ground-stations. Specific receiving equipment, still
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