The RAMSES system provides two-way high data rate communications between mobile users, located anywhere on the Earth visible to a GEO satellite, and the world’s terrestrial communications networks. Land, sea and aeronautical users are served.
The feeder link antenna system consists of 6 SFPB steered reflectors of diameter 0.85 m. The global coverage antenna system uses separate Ka-band horns for both transmit and receive. The switching system that drives the beam-hopping capability is intended to be integrated onto the back of the feed arrays. This system will use fast switching ferrites so avoiding the problem of mechanical wear.
The payload can be considered to consist of various sub-payloads. The global payload with 448 narrow spot beams over the face of the visible Earth can be conveniently broken into the following parts.
The high capacity payload antenna system is identical to Configuration 1 except perhaps in some minor ways concerned with the mounting to the platform. Similarly for the feeder link antennas.
The payload can be considered to consist of various sub-payloads just like Configuration #1. Many features are the same as the previous configuration.
Differences from Configuration 1 include:
- The global payload receive and transmit integrated DRAs
- A different number of RF paths between the DRAs and the processor
- Different nature of the connection between DRA units and processor (optical)
- Different sized commercial DSP with beam-forming function.
The global payload RF paths within the integrated DRA units are phased aligned, then between DRAs and main DSP the paths are optical digital and need to be time aligned.