Evolutions to EUMETCast services for the MTG era

The EUMETSAT user base of 4000+ existing user stations will continue to rely on the existing EUMETCast DVB-S2 reception technology in the MTG era.

The existing EUMETCast service should assist users in seamless transition to high rate acquisition of high volumes of MTG data and products. Multicast technology and dissemination logic remains the same in the MTG ear with data rates and volumes growing considerably. Therefore, it is crucial for EUMETCast users to tailor their reception and downstream systems to be able to cope with the novel data that will start streaming after the launch of first MTG-I satellite, continuing to grow before the Full Operational Capability is reached.

Data Rate Assumptions

Currently MTG data volumes are fairly well determined, although smaller variations to projections are expected before the Full Operational Capability is reached.

EPS-SG Mission (almost parallel in time to MTG Mission) data volumes contain a bigger margin and, further reduction in data rates seems possible.

The EUMETCast service will be upgraded between 2021 and 2024, with significantly increased resources.

Figure 1: Example of EUMETCast Europe Data Rates
Figure 2: Example of EUMETCast Europe Transponder Capacity

The transponder resources and characteristics will be a result of the following factors:

  • Footprint (aim is compatibility with current footprint).
  • Number of DVB (Digital Video Broadcasting) satellites.
  • Transponder bandwidth, wide band transponders can always be 'partitioned' in smaller bandwidth.
  • Frequency band and polarisation, which, has impact on LNBs (Low Noise Block).
  • The DVB-S2 standard will remain unchanged.

User Impact

Since the High Volume service is already in place for EUMETCast, users should have a good idea on the broadcasting system setup way before the launch and commissioning of the first MTG satellite.

At least one separate antenna is required for each DVB Satellite, large enough for the High Volume service. One additional spare/backup antenna is suggested for professional users, to allow uninterrupted service in case of antenna maintenance.

Depending on the distance between the satellites, dual feed systems can be used.

Figure 3: Example of two satellite constellation - redundant set up
Figure 4: Example of two satellite constellation - minimum set up

Downlink frequency band is in KU band. Each transponder works on a single KU sub-bands:

  • Frequency band, can be high or low.
  • Polarisation, can be horizontal or vertical.

A QUATTRO LNB (Low Noise Block) downconverter can support all KU sub-bands simultaneously, i.e. is ready to support reception of any number of transponders from the same satellite. The recommendation is to use QUATTRO LNBs for each antenna (in connection with multi-switches).

In order to connect LNB with DVB multiswitch four coaxial RF connector cables are needed. Each DVB multiswitch can support multiple inputs (one or more LNBs) and multiple outputs to DVB receivers. Each transponder requires one separate receiver.

DVB routers are suggested for easy upgrade concept. DVB cards require more integration effort into the reception PC.

Figure 5: Example of receiver chain
Figure 6: Example of receiver chain scaled up
 
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