The maximum downlink bitrate of the system is 2.5 Mbit/s. The EGS will be capable of receiving scientific data and housekeeping’s from the satellite at a minimum elevation angle of 30 degrees with a BER of 10E-06 at 2.2 Mbit/s. The downlink bitrate of the satellite can be switched to a reduced rate. In this case the telemetry can be received from lower elevation angles.
The antenna system consist of a parabolic aluminum reflector of 2.4 m diameter and an integrated diplexing feed/LNA/downconverter front-end for reception and transmission at S-band.The antenna is mounted on a pedestal for program track of the satellite. No radom will be used, thus some wind speed constraints must be taken into account for the operation of the antenna.
The downlick components consists of a BPSK receiver and the Bit & Frame synchronizer cards. Time synchronization and location determination of the station will be done by reception of GPS data. An I/O interface, will function as an interface to the GPS Antenna & Receiver. This interface is also used to communicate with the antenna control electronics. The modem for uplink functions. The control computers are connected to a LAN for data communication and archiving. The system is planed to be run under the windows NT operating system.
As the EGS has not the main responsibility for mission operations, there is no system redundancy. Defective components must be replaced in case of failure.