GSC Sentinel-2 PDGS SRD - emits - ESA

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GSPs GSC Sentinel-2 PDGS SRD Issue 1 Revision 2 (draft) - 25.07.2010 GMES-GSEG-EOPG-RD-09-0028 page 28 of 204 collaborative mirror centres (CDAM), or Users themselves interacting with the PDGS under the hosted-processing collaboration framework. In addition, although formally considered within the PDGS functional perimeter, the following interfaces to external entities that provide PDGS functional services have been identified: ○ Third-party Auxiliary Data Providers (ADP) for the operational provision of Auxiliary Data Files to be used by the PDGS for the data-processing activities. ○ The selected distributing entity for the Sentinel-2 MSI WICOM image decompression software referred as MSI Decompression Provider (MDP). ○ Expert Cal/Val Teams supporting specific CAL/VAL functions, quality control activities, etc. (e.g. Off-line POD service, MSI Cal/Val specific campaigns, etc.). S2A/B EDRS TM/TC LCT X-Band signal Ka-Band relay signal FOS LGS EDRS Exploitation Segment PDGS Operation Manager (POM) Collaborative PDGS Entities Auxiliary Data Providers WICOM Decomp.S/W Expert CAL/VAL Teams CDS Users Figure 3-1 PDGS Interfaces CST The PDGS Master ICD [MICD] further identifies and details every interface and describes their operation context within the PDGS physical layout. ESA UNCLASSIFIED – For Official Use © ESA The copyright of this document is the property of ESA. It is supplied in confidence and shall not be reproduced, copied or communicated to any third party without written permission from ESA.
GSC Sentinel-2 PDGS SRD Issue 1 Revision 2 (draft) - 25.07.2010 GMES-GSEG-EOPG-RD-09-0028 page 29 of 204 3.2 Functional Decomposition The first-level of the PDGS functional decomposition discriminates between Data Management functions, System Control functions and Data-Communication functions. Whilst the first group refers to the primary core duty of the PDGS of translating the satellite acquired data into data-access services to the Sentinel-2 product users, the second regroups all functions required at system-level to control, manage and coordinate the overall system behaviour. Some specific functions although relevant to both groups have been allocated to a specific one, with the logic that they mostly apply to the specificities of the allocated group by their primary functionality and main drivers. The last group includes all physical data communication functions between or within Data- Management or System-Control functions. 3.2.1 DATA MANAGEMENT FUNCTIONS As primary goal, the Data-Management Functions aim at reliably and systematically transporting the Sentinel-2 constellation data from the antenna down to its authorised users into elaborated user-products of controlled quality, timeliness and access performances. Following this logic the following primary functions are identified as illustrated on Figure 3-2. ○ A Data-Reception (DRX) function responsible for data acquisition from the spacecrafts and front-end data-handling activities. This function aims for a maximum reuse of existing ground-infrastructure X-Band tracking antennas (or EDRS compatible Ka-Band still antennas) and a sentinel-generic Demodulator and Front-End Processing (DFEP) equipment; ○ A Data Processing Control (DPC) function responsible for managing all data processing activities, in charge of the systematic processing of Level-0 products and higher-level production management through dedicated data-processors. It is also in charge of supervising on-line quality control activities on the performed production and for hosting user-provided processors fruit of third-party hostedprocessing collaborations. The DPC function aims for a rule-based data-driven management of the real-time dataflow, whilst offering additional on-demand processing capabilities as required for Data-Access. It is intended as providing most of the required parallel processing management and be highly scalable with computing hardware in this respect. ESA UNCLASSIFIED – For Official Use © ESA The copyright of this document is the property of ESA. It is supplied in confidence and shall not be reproduced, copied or communicated to any third party without written permission from ESA.
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