GSC Sentinel-2 PDGS OCD - Emits - ESA

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GSC Sentinel-2 PDGS OCD Issue 1 Revision 2 (draft) - 25.07.2010 GMES-GSEG-EOPG-TN-09-0008 page 248 of 350 6.1.2 OPERATION SCENARIOS 6.1.2.1 Data Reception Configuration This scenario accounts for the operator-driven configuration of the DRX function in a CGS according to the Sentinel-2 specific needs. The following steps are identified for this operation scenario: 1) The configuration of the physical locations in geodetic position and altitude of all X- Band LEO tracking antennas or Ka-Band GEO pointing antennas enabled for receiving the Sentinel-2 satellites; 2) The ground station and antennas masks configuration is provided to the MCC function. Such configuration will be later on used by the MPL function for the mission planning activities (cf. section 6.15); 3) The configuration of the RF signal acquisition, including the downlink frequencies and signal levels according to the Sentinel-2 spacecrafts, possibly differently per Sentinel-2 spacecraft; 4) The configuration of the front-end data-handling operations (e.g. the virtual channels identification); 5) Data archiving configuration including: o The mapping of VCIDs into the archive files (all packets from the same virtual channel grouped in a single ordered stream as per data transmission constraint). The map is done according to the Sentinel-2 VCID map per spacecraft o Maximum dimension of the archive folder per pass (containing all archived files). An adequate maximum dimensioning will be needed to preserve the retrieval performances o The data retention time in the archive 6) Data distribution configuration, including: o The front-end processing unit selected for nominal real-time data-supply among the two hot redundant items; o The network distribution rules to data consumers for data supply. This will be configured under the form of a routing table associating sink network addresses to the source data discriminating S/C-ID, VCID, and APID identifiers e.g. {netaddr X; enabled; S2A; VC 4; AP-x}. 7) Monitoring and Control reporting configuration, including: o The list of parameters to be inserted in the reports (e.g. Mission, frames ingested, RS corrected frames, RS un-correctable frames, carrier input level, etc.). According to a well-defined ICD, Data reception reports will be customised for usage by the MPA function for assessment of the data reception performance 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.
o Report generation frequency and coverage 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 249 of 350 This operation scenario is used for the configuration of the DRX function when deployed in a Sentinel-2 assigned data reception centre. Firstly the configuration will cover the Sentinel-2A spacecraft and then complemented when additional spacecrafts are added to the mission. 6.1.2.2 Load of the Acquisition Schedule This scenario accounts for the autonomous loading of Sentinel-2 acquisition schedule according to the DRX configuration. The acquisition schedule comprises the data reception and front-end processing activities. The following steps are identified for this operation scenario: 1) The DRX function autonomously gathers the new acquisition schedule (containing the spacecraft TLEs, the AOS & LOS events, and the front-end processing events) as provided by the MPL function; 2) The DRX function autonomously loads the acquisition schedule to enable the data reception and front-end processing activities. Accordingly the acquisition and front-end agendas are updated ready to be activated shortly preceding the planned AOS. The antenna that will support the reception is pre-selected for each planned reception; 3) The DRX function alerts in case of conflict with a previous planning (e.g. operations conflict with another mission). The acquisition schedule is generated by the MPL function as part of the mission plan generation activities. The MPL function supplies it to all the involved ground-stations. In a second step, the acquisition schedule is updated by the MPL function and supplied to the ground stations according to the availability of more accurate orbit ephemeris. 6.1.2.3 Current Pass Data-Reception and Real-Time ISP Supply This scenario accounts for the autonomous data acquisition, front-end processing and realtime data supply. The DRX function acquires and decodes the mission data (science, ancillary & X-Band HKTM) downlinked from the satellites during a given pass, process it and distribute it in real-time towards the data consumers (i.e. the DPC function). The Instrument Source Packets supply towards the data consumers is started in real-time as soon as there is new data of the current pass available (i.e. not waiting until the pass has been completed but on-the-flow). This scenario also accounts for the local archiving of the acquired data and processed data at VCDU level discriminated by the VCID (science nominal, NRT and RT; ancillary and HKTM data respectively) according to the archiving strategy defined in the DRX function configuration scenario. The following steps are identified for this operation scenario: 1) According to the acquisition schedule (cf. 6.1.2.2), the data reception activities are activated shortly before the planned AOS event. The antenna selected for acquisition is moved to the AOS position using the applicable TLE and signal search is activated enabling tracking on the RF carrier signal with the associated antenna movement until the planned LOS; © 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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[RD-33] Sentinel-2 MSI - Level 2A A
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LES LGS Land Equipped Sites Local G
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GSC Sentinel-2 PDGS OCD - Emits - ESA

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