GSC Sentinel-2 PDGS STBD - emits - ESA
GSC Sentinel-2 PDGS STBD - emits - ESA GSC Sentinel-2 PDGS STBD - emits - ESA
GSC Sentinel-2 PDGS STBDIssue 1 Revision 2 (draft) - 25.07.2010GMES-GSEG-EOPG-TN-09-0031page 45 of 60Therefore, one satellite produces the following Level-0 and Level-1C data volumes (inGBytes):CGS-1 CGS-2 CGS-4 CGS-3 All StationsAverage daily volume of Level-0 366,80 89,66 138,57 220,08 815,10Average daily volume of Level-1Bor Level-1CAverage monthly volume ofLevel-0Average monthly volume ofLevel-1B or Level-1C560,29 136,96 211,66 336,17 1245,0811003,85 2689,83 4157,01 6602,31 24453,0016808,61 4108,77 6349,92 10085,16 37352,46Table 7: Data Volumes generated per product-type and Ground Station (GBytes)4.3 Data Circulation Budget EstimationsCirculation data rate has been derived as follows:Data-rate= DataVolume(T)/TWhere DataVolume(T) is the sum of the data to be transmitted during the period T.The table sums up the exchanges detailed in Table 6. Values in the table refer to an averagerequired data-rate and are expressed in Mebibit per second (Mib/s).FromCGS-1CGS-2CGS-3CGS-4PAC-1PAC-2ToPAC-1 87.9 21.5 33.2 52.7 98PAC-2 87.9 21.5 52.7 151.3Table 8: Estimated Circulation Data Rates (Mib/s)Note: the physical mechanism for data exchange (via media or digital networks) will bedefined from a cost/technical trade-off amongst available solutions. The goal is to make useof digital networks as much as possible. However, looking at the overall throughput required,a complementary circulation via media may be considered. It is highlighted that theoperation concept regarding data circulation imposes little requirements on the end-to-endlatency, but imposes a strong sustained throughput. Hence circulation via network or mediawill both be compatible with this mode of operation.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 46 of 60Customarily, the physical network bandwidth is dimensioned to the double of the estimateduseful data rate so as to ensure a correct functioning of this critical component. For example,the physical network bandwidth necessary for the circulation from CGS-1 to PAC-1 would bedimensioned to about twice 87.9 Mib/s i.e. 175 Mib/s for a correct functioning.4.3.1 DATA CIRCULATION IMPACTS ON THE PROCESSING TIMEALLOCATIONIn the scenarios analysis, data processing and data circulation have been completelydecoupled therefore in the budget allowing assessing the duration for data processing thereis no allocation to the data transfer time from the Ground station to the processing centre.This choice is justified by the assumption that data reception and data processing should begenerally collocated. Indeed, n these scenarios, only the data received by the CGS-4 areprocessed by the remote PAC-1 (these data should not include NRT data), for other CGSthe processing is collocated.Considering the circulation data rate estimated in §4.2, one average orbit is transferred fromthe CGS-4 centre to the PAC-1 in:T transfer = DataVolume / DataRate ≈ 7,4 hoursDepending of the actual data transfer bandwidth available, this additional latency should betaken into account in the overall sizing of the sink PAC, to consider the reduced time budgetleft for Level-1C processing to meet the 24 hours end-to-end requirement from sensing.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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<strong>GSC</strong> <strong>Sentinel</strong>-2 <strong>PDGS</strong> <strong>STBD</strong>Issue 1 Revision 2 (draft) - 25.07.2010GMES-GSEG-EOPG-TN-09-0031page 45 of 60Therefore, one satellite produces the following Level-0 and Level-1C data volumes (inGBytes):CGS-1 CGS-2 CGS-4 CGS-3 All StationsAverage daily volume of Level-0 366,80 89,66 138,57 220,08 815,10Average daily volume of Level-1Bor Level-1CAverage monthly volume ofLevel-0Average monthly volume ofLevel-1B or Level-1C560,29 136,96 211,66 336,17 1245,0811003,85 2689,83 4157,01 6602,31 24453,0016808,61 4108,77 6349,92 10085,16 37352,46Table 7: Data Volumes generated per product-type and Ground Station (GBytes)4.3 Data Circulation Budget EstimationsCirculation data rate has been derived as follows:Data-rate= DataVolume(T)/TWhere DataVolume(T) is the sum of the data to be transmitted during the period T.The table sums up the exchanges detailed in Table 6. Values in the table refer to an averagerequired data-rate and are expressed in Mebibit per second (Mib/s).FromCGS-1CGS-2CGS-3CGS-4PAC-1PAC-2ToPAC-1 87.9 21.5 33.2 52.7 98PAC-2 87.9 21.5 52.7 151.3Table 8: Estimated Circulation Data Rates (Mib/s)Note: the physical mechanism for data exchange (via media or digital networks) will bedefined from a cost/technical trade-off amongst available solutions. The goal is to make useof digital networks as much as possible. However, looking at the overall throughput required,a complementary circulation via media may be considered. It is highlighted that theoperation concept regarding data circulation imposes little requirements on the end-to-endlatency, but imposes a strong sustained throughput. Hence circulation via network or mediawill both be compatible with this mode of operation.<strong>ESA</strong> UNCLASSIFIED – For Official Use© <strong>ESA</strong>The copyright of this document is the property of <strong>ESA</strong>. It is supplied in confidence and shall not be reproduced, copied orcommunicated to any third party without written permission from <strong>ESA</strong>.
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