GSC Sentinel-2 PDGS SRD - emits - ESA

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GSC Sentinel-2 PDGS SRD Issue 1 Revision 2 (draft) - 25.07.2010 GMES-GSEG-EOPG-RD-09-0028 page 154 of 204 playback the priority RT data over coinciding CGSs as driven by the Image- Acquisition-Plan; use the remaining downlink capacity to playback the non RT data buffered on-board; systematically playback the NRT before the nominal data partitions at CGS downlink contact segments granted for the reception of NRT data; maximise the usage of the CGS downlink budget available to playback the on-board recorded data within spacecraft capabilities; systematically minimize the age of the MSI data at the time it is received on ground considering the above priorities. S2-PDGS-MPL-155 The PDGS/MPL function shall be able to process the Mission-Plan response provided by the FOS to acknowledge the scheduling of the requested activities. In case of any discrepancy, the MPL function shall alert to the operator accordingly. S2-PDGS-MPL-160 The PDGS/MPL function for the Mission-Plan generation activities shall make use of a simplified satellite operation model for data-handling configurable separately per spacecraft through the following parameters at minimum: the effective MSI data supply rate of each detector after WICOM compression the MSI detectors activated the MSI data handling granularity the sizes of the MMFU MSI packet store, the ancillary packet store and the HKTM packet store, the X-band and OCP effective downlink rates per each channel the S-band effective uplink rate (to estimate the uplink time) (TBC) S2-PDGS-MPL-165 The PDGS/MPL function shall be able to generate the ground-stations (CGS & LGS) Acquisition-Schedule-Plan according to the acknowledged Mission-Plan. S2-PDGS-MPL-170 The PDGS/MPL function shall be to notify in advance to every ground station the list of required downlink passes according to the Acquisition-Schedule-Plan. S2-PDGS-MPL-175 The PDGS/MPL function shall be able to generate the EDRS Booking-Plan according to the acknowledged Mission-Plan. 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 155 of 204 S2-PDGS-MPL-180 It shall be possible to constrain the Mission-Plan generated by the PDGS/MPL function according to the following minimum set of parameters configurable separately per spacecraft: the MSI sensing segment minimum length the MSI duty cycle the XBS duty cycles the OCP duty cycle etc S2-PDGS-MPL-185 The PDGS/MPL function shall generate the ground-stations Acquisition-Schedule-Plan including recent (daily) orbit information (i.e. predicted orbit file, TLE, etc.) , and time segments applicable to the antenna reception and the required front-end processing activities. S2-PDGS-MPL-190 The PDGS/MPL function, as part of the Acquisition-Schedule-Plan generation, shall be able to manage overlapping CGSs avoiding / minimizing the amount of data duplicated on them. S2-PDGS-MPL-195 As part of the Mission-Plan generation activities, the PDGS/MPL function shall make use of the spacecraft model to derive the on-board memory usage along the orbit through including: the sensor data stream volume (compressed or not) deriving from the imaging plan and detector/compression configuration the MMFU occupation / usage (for nominal and NRT entries, FIFO logic) according to the imaging plan and Downlink-Plan the MMFU occupation / usage for the HKTM data according to the Downlink-Plan the MMFU occupation / usage for the Ancillary data according to the Downlink-Plan S2-PDGS-MPL-200 The PDGS/MPL function shall be able to optimise the Downlink-Plan by delaying when appropriate the start of the MSI downlink in order to maximize the volume of data transmitted to the ground during the visibility window. This functionality shall be activated as an option. S2-PDGS-MPL-205 The PDGS/MPL function shall be able to generate the EDRS effective booking plan to be forwarded to the EDRS user-segment according to the acknowledged Mission-Plans. 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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GSC Sentinel-2 PDGS SRD - emits - ESA

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