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 166 of 350
considered an enhancement to the PDGS data dissemination capabilities, it can be
commissioned separately without any impact on on-going operations. The data-relay and
repatriation links will however require dedicated validation before operational transfer.
As the reshaping of the PDGS to support the EDRS scenario will require specific investments
for the deployment of new facilities or the upgrade of existing ones, it is assumed that EDRS
capabilities will be preliminarily validated as part of EDRS commissioning activities without
requiring such investment as pre-requisite. It is hence expected that for all three services, the
EDRS program will put in place a validation framework. The PDGS RP and specific front-end
processing hardware will however be used in complement to this framework to support
Sentinel-2 specific validation activities.
The overall approach will thus result in a two-phase validation:
○ At first, the EDRS service will commissioned making use of the EDRS validation
framework and the RP;
○ Once pre-qualified on this framework, the required PDGS deployment activities will
follow and a second validation activity will be performed. The validation of this last
step will trigger the operation transfer activities described in 4.6.5.2.
As part of its nominal operations, the reference platform will pre-qualify all specific hardware
required to support the EDRS scenario before deployment to the PDGS centres.
The following paragraphs describe this approach as applied to the three distinct EDRS
services. Although described separately they will be carried out in parallel.
4.6.5.1.1 Data-Relay Link
The EDRS data-relay capability can be commissioned with Sentinel-2 at the same time and
without any impact on operations. This will be achieved via the parallel downlink of the
mission data routed through the XBS and OCP at selected orbits.
In a preliminary step, to be carried out during the commissioning phase of the EDRS
piggyback payload, the data-relay link with Sentinel-2 will be validated using the EDRS
provided validation framework. For this, a PDGS provided front-end reception equipment will
be installed in this framework and used to validate the data-reception compatibility. In turn the
received data will be shipped to the reference platform and tested for compatibility against the
Level-0 and higher level processors.
In a second validation step, to be carried out at one PDGS ground facility intended to
ultimately receive EDRS relayed data, the ground-reception compatibility will be
commissioned and further processing will be carried out, possibly delayed after the
operational processing (e.g. during idle periods) if this ground-facility happens to be reusing
an X-Band facility.
4.6.5.1.2 Data-Repatriation Link
It is assumed the EDRS data-repatriation link will be commissioned in a preliminary step on
the EDRS validation framework without any involvement of the Sentinel-2 PDGS.
Following the PDGS required hardware deployments, such as the transmission and multicast
reception equipment, the data-repatriation capabilities will be validated in parallel to nominal
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