GSC Sentinel-2 PDGS STBD - emits - ESA

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GSC Sentinel-2 PDGS STBDIssue 1 Revision 2 (draft) - 25.07.2010GMES-GSEG-EOPG-TN-09-0031page 23 of 603.3.2.1 Level-0 Processing3.3.2.1.1 MSI Telemetry Analysis: Parallelization by DetectorThe MSI Telemetry Analysis is performed within the GPP algorithm by the Ana_TM-Imagefunction of the Ana_TM IAS.As showed in Figure 7, Ana_TM-Image function can be parallelised by detector, then 12times. The processing can be run in real-time (i.e. with an effective I/O rate of 520Mbps), aslong as the data are received.Figure 7: possible processing parallelisation in Ana_TM Image3.3.2.1.2 Satellite Ancillary Telemetry Analysis: no parallelizationThe Satellite Ancillary Telemetry Analysis is performed within the GPP algorithm by theAna_TM-SAD function of the Ana_TM IAS. This processing step cannot be parallelisedbecause Satellite Ancillary Telemetry is expected to be transmitted in one stream but it canbe run in real-time (i.e. with an effective I/O rate of 520Mbps), as long as the data arereceived.ESA UNCLASSIFIED – For Official Use© ESAThe copyright of this document is the property of ESA. It is supplied in confidence and shall not be reproduced, copied orcommunicated to any third party without written permission from ESA.
GSC Sentinel-2 PDGS STBDIssue 1 Revision 2 (draft) - 25.07.2010GMES-GSEG-EOPG-TN-09-0031page 24 of 603.3.2.1.3 Datation: Parallelization by Band and by DetectorAs showed in Figure 8, it is possible to parallelize Datation by band and by detector.For each band and each detector, starting from the beginning of the group of source packet,the time tagging is performed considering a shifting window comprising 3 consecutivescenes in order to guarantee the datation consistency along all the datastrip. Thisprocessing can be run in real-time as long as 3 consecutive scenes are received.There is also the option of refining the datation using a time regression model and in thiscase this processing step needs all the source packets time stamps for the computation.ESA UNCLASSIFIED – For Official Use© ESAThe copyright of this document is the property of ESA. It is supplied in confidence and shall not be reproduced, copied orcommunicated to any third party without written permission from ESA.
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