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 36 of 204 procured via the EDRS program, will provide the adequate Ka-Band demodulation capabilities on ground and restore the dual 280Mbps data-streams in baseband ready for front-end processing. The dual 280Mbps channels restored in baseband after the EDRS ground equipment will be clear of any encryption. [Assumption-12] The apportioned availability to Sentinel-2 for data-relay downlinks via the EDRS constellation will be pre-defined at static times phased along the Sentinel-2 orbit repeat cycle, following a preliminary agreement with the EDRS exploitation segment in coordination with Sentinel-1. [Assumption-13] The Sentinel-2 mission can use operationally the EDRS 230Mbps data-repatriation multicast link for a third of the total time. [Assumption-14] The operation constraints of the OCP will be later characterised by a well-defined operation duty-cycle and an overall limit to the overall number of operation switches sized for the OCP lifetime, similarly to the XBS. [Assumption-15] The MSI timeline received on-ground after downlink will be provided with a granularity of exactly one MSI on-board scene (corresponding to 3.48 seconds of instrument operation and about 23km on ground along-track) as corresponding to the minimum indivisible packet size of the MSI. A playback-stop commanded while an MSI scene is being downlinked will effectively stop the playback and transmission only after the MSI scene has been entirely transmitted. [Assumption-16] The on-board recording of the ancillary data does not require specific scheduling at PDGS mission-planning level as being either entirely autonomous on-board or systematically triggered and maintained through FOS flight operation procedures. The ancillary data is recorded continuously including when the MSI is not operating, or when it is operating in standby or idle modes. [Assumption-17] The XBS can remain in operation mode without the necessity of a temporary transition to standby even when the MMFU is not feeding data to the XBS e.g. during the time separating two successive datadownlinks to ground-stations. In this case, it is assumed idle transfer frames are transmitted instead. [Assumption-18] During orbit control and in case of attitude problems, the MSI shutter shall be closed to protect the instrument. This constraint will be managed by the FOS. [Assumption-19] In response to potential X-Band access conflicts between Sentinels, a conflict-free coordination among Sentinels will result in a predefined allocation of downlink passes available for Sentinel-2. This allocation will be static to a large extent (e.g. on a six to three months basis at least) and will be settled after the selection of the CGS network, or inany case at the time of the Sentinel-2 PDGS deployment phase. 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 37 of 204 4.2 Open Issues The present document includes TBD/TBC in relation to the following issues still open. EDRS GS and S/S technical specifications and interfaces. Technical details are missing regarding the interfaces between the PDGS and the EDRS GS as well as the PDGS functions necessary for the exploitation of the EDRS in support to the Sentinel-2 mission. Technical details are missing regarding the S2G ICD for the EDRS satellite limiting the definition/consolidation of requirements for the Ka-band data reception and ingestion function of the PDGS. Spacecraft(s) Safety Constraints File. A complete list of Sentinel-2 Spacecraft(s) Constraints affecting the mission planning as well as which constraints shall be verified by the FOS or by the PDGS is still to be defined. Next Generation User Services for Earth Observation (ngEO) technical specifications and interfaces. The ngEO system will be a new element of ESA’s Multi-Mission User Services (MMUS) environment reused for the Sentinel-2 PDGS. It is complemented with the overall MMUS by other legacy elements such as Single Sign-On (SSO), the Support-Desk, etc. As being a new element under design and development, its detailed baseline, interfaces within the Sentinel-2 PDGS, and detailed operation scenario with other PDGS elements are still to be defined at the level of Technical Specifications and ICDs. PDGS physical layout and interconnecting network infrastructure. The PDGS ground infrastructure composed of core ground stations, complementary centres and an interconnecting network to support the operations is still to be settled. In this respect, the system technical budget [STBD] (cf. [ND-10]) provides the logic and elements required to derive the firm PDGS technical budget once the physical layout is defined. 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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S2-PDGS-NET-065 The DCN shall provi
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